MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 a21fb17320fb3f39015aeff2d22e3ab37eb2a11713f4fc99fbd6effc07635eae. While MalwareBazaar tries to identify whether the sample provided is malicious or not, there is no guarantee that a sample in MalwareBazaar is malicious.

Database Entry


RemcosRAT


Vendor detections: 20


Intelligence 20 IOCs YARA 23 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: a21fb17320fb3f39015aeff2d22e3ab37eb2a11713f4fc99fbd6effc07635eae
SHA3-384 hash: fb9a3f2b384f137a4557d2baf98aba8317b9f76fe02e183947bf72acb59413dc1d76eb1b9c90db7bb657d06ac9994166
SHA1 hash: b7daf8bff5a23637e68c9b626acaa3402bcbc6a2
MD5 hash: caab871b33cb43f43a2c4aac12898f87
humanhash: ohio-diet-wisconsin-oxygen
File name:COZYREM2.exe
Download: download sample
Signature RemcosRAT
Create hunting rule
File size:498'688 bytes
First seen:2025-03-18 12:35:16 UTC
Last seen:2025-03-19 13:09:20 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash 41e05d591d7d93bdd5bc6d5da04da74b (52 x RemcosRAT, 1 x Expiro)
ssdeep 6144:/IlSCa0RPvRz+n8Qr1D0ZGESuHabmvHOE4mCp6qtydBnP+Y4+3sAORZGFX3Xc6rJ:/200OFp+G0imvHn3Cp6qyBP+YdsvZGx
Threatray 634 similar samples on MalwareBazaar
TLSH T14EB4BF01B9E2C172D57654300D2AE776DEBCBD2028358D7BB3D60D57FE30190AA39AB6
TrID 32.2% (.EXE) Win64 Executable (generic) (10522/11/4)
20.1% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
15.4% (.EXE) Win16 NE executable (generic) (5038/12/1)
13.7% (.EXE) Win32 Executable (generic) (4504/4/1)
6.2% (.EXE) OS/2 Executable (generic) (2029/13)
Magika pebin
dhash icon c4d48eaa8ad4d4f8 (1'000 x RemcosRAT, 1 x Worm.Ramnit, 1 x Vjw0rm)
Reporter KatzenTech
Tags:176-65-144-3 exe RemcosRAT

Intelligence

File Origin
# of uploads :
2
# of downloads :
413
Origin country :
RU RU
Vendor Threat Intelligence
Malware family:
remcos
Create hunting rule
ID:
1
File name:
COZYREM2.exe
Verdict:
Malicious activity
Analysis date:
2025-03-18 12:49:31 UTC
Tags:
rat remcos remote stealer mpress
Link:
https://app.any.run/tasks/04cfddd7-8be4-47bf-bf58-dfd8d9f70ba0

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Malicious
Score:
99.9%
Link:
https://cyber-fortress.com/docs/result/index.php?id=67d973d5194f23322a70c0a7
Tags:
ransomware dropper remcos virus
Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
Сreating synchronization primitives
Launching a process
Connection attempt to an infection source
DNS request
Connection attempt
Sending an HTTP GET request
Creating a file in the %temp% subdirectories
Reading critical registry keys
Creating a file
Query of malicious DNS domain
Sending a TCP request to an infection source
Forced shutdown of a system process
Stealing user critical data
Unauthorized injection to a system process
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
cmd config-extracted crypto evasive exploit explorer fingerprint fingerprint keylogger lolbin microsoft_visual_cc packed rat remcos remcos windows
Link:
https://www.filescan.io/uploads/67d968bdd2c4beeae92772ac/reports/e494b4f4-3961-4cca-88bb-df675730ec2d/overview
Verdict:
Malicious
Labled as:
Trojan.Remcos
Link:
https://www.hybrid-analysis.com/sample/a21fb17320fb3f39015aeff2d22e3ab37eb2a11713f4fc99fbd6effc07635eae
Result
Verdict:
MALICIOUS
Details
Windows PE Executable
Found a Windows Portable Executable (PE) binary. Depending on context, the presence of a binary is suspicious or malicious.
Malware family:
REMCOS
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/b43690cc-7a8e-45d8-88c8-3918ee700c2b
Result
Threat name:
Remcos
Create hunting rule
Detection:
malicious
Classification:
rans.phis.troj.spyw.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1641767
Signature
Antivirus / Scanner detection for submitted sample
Antivirus detection for URL or domain
Attempt to bypass Chrome Application-Bound Encryption
C2 URLs / IPs found in malware configuration
Contains functionality to bypass UAC (CMSTPLUA)
Contains functionality to inject code into remote processes
Contains functionality to register a low level keyboard hook
Contains functionality to steal Chrome passwords or cookies
Contains functionality to steal Firefox passwords or cookies
Contains functionalty to change the wallpaper
Detected Remcos RAT
Found evasive API chain (may stop execution after checking mutex)
Found evasive API chain checking for user administrative privileges
Found malware configuration
Joe Sandbox ML detected suspicious sample
Malicious sample detected (through community Yara rule)
Maps a DLL or memory area into another process
Multi AV Scanner detection for submitted file
Sample uses process hollowing technique
Sigma detected: Potential Data Stealing Via Chromium Headless Debugging
Sigma detected: Remcos
Suricata IDS alerts for network traffic
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Instant Messenger accounts or passwords
Tries to steal Mail credentials (via file / registry access)
Tries to steal Mail credentials (via file registry)
Uses dynamic DNS services
Writes to foreign memory regions
Yara detected Remcos RAT
Yara detected UAC Bypass using CMSTP
Yara detected WebBrowserPassView password recovery tool
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1641767 Sample: COZYREM2.exe Startdate: 18/03/2025 Architecture: WINDOWS Score: 100 27 remyma.duckdns.org 2->27 29 geoplugin.net 2->29 43 Suricata IDS alerts for network traffic 2->43 45 Found malware configuration 2->45 47 Malicious sample detected (through community Yara rule) 2->47 51 10 other signatures 2->51 8 COZYREM2.exe 5 26 2->8         started        signatures3 49 Uses dynamic DNS services 27->49 process4 dnsIp5 37 remyma.duckdns.org 172.94.9.132, 49691, 49694, 49695 VOXILITYGB United States 8->37 39 geoplugin.net 178.237.33.50, 49696, 80 ATOM86-ASATOM86NL Netherlands 8->39 41 127.0.0.1 unknown unknown 8->41 53 Contains functionality to bypass UAC (CMSTPLUA) 8->53 55 Detected Remcos RAT 8->55 57 Attempt to bypass Chrome Application-Bound Encryption 8->57 59 8 other signatures 8->59 12 RmClient.exe 8->12         started        15 recover.exe 1 8->15         started        17 recover.exe 1 8->17         started        19 4 other processes 8->19 signatures6 process7 dnsIp8 61 Contains functionality to bypass UAC (CMSTPLUA) 12->61 63 Detected Remcos RAT 12->63 65 Found evasive API chain (may stop execution after checking mutex) 12->65 75 3 other signatures 12->75 67 Tries to steal Instant Messenger accounts or passwords 15->67 69 Tries to harvest and steal browser information (history, passwords, etc) 15->69 71 Tries to steal Mail credentials (via file / registry access) 17->71 31 192.168.2.9, 138, 443, 49690 unknown unknown 19->31 73 Tries to steal Mail credentials (via file registry) 19->73 22 chrome.exe 19->22         started        25 msedge.exe 19->25         started        signatures9 process10 dnsIp11 33 googlehosted.l.googleusercontent.com 142.250.185.225, 443, 49709, 49710 GOOGLEUS United States 22->33 35 clients2.googleusercontent.com 22->35
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/a21fb17320fb3f39015aeff2d22e3ab37eb2a11713f4fc99fbd6effc07635eae
Detection:
remcos
Create hunting rule
Link:
https://mwdb.cert.pl/sample/a21fb17320fb3f39015aeff2d22e3ab37eb2a11713f4fc99fbd6effc07635eae/
Threat name:
Win32.Backdoor.Remcos
Create hunting rule
Status:
Malicious
First seen:
2025-03-18 12:36:06 UTC
File Type:
PE (Exe)
Extracted files:
8
AV detection:
29 of 36 (80.56%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=uip3c4za7m7tsak257znelr2wn7lfiixcp2pzgp323x7yb3dl2xa._file
Verdict:
malicious
Label(s):
remcos
Create hunting rule
Similar samples:
124b893db4e3bc683c296095df39918daa94808e0b4043686d8f380a30c38cc8
RemcosRAT
75fed14fd61067a1c0c2a10d0eefcc349308e1f4a1993a075a9f0c768affab13
RemcosRAT
78cc96452121dc657a87c79561272f3669f781d24265a7a2ab853a5670fff80d
RemcosRAT
7f7860172d4e076099724e55875a797b9206365a4e6f52cf93f57371fd7fcc82
RemcosRAT
88d5346489cca6b4114b60889108d286c46144507e2011081e0c7080eeb18d03
RemcosRAT
d3626bd96d6a11668a6864a514fa77ebb3372a5f88069b4aba668b773e3d6946
RemcosRAT
error
RemcosRAT
fa1c16a3024d35ebc4f6996d1791ead89a08dae2ebd87e39c9997c04613c4645
RemcosRAT
fa61518375428781260a99edf971bcc98b70df3e7c5d2887367393f4e206f30d
RemcosRAT
+ 624 additional samples on MalwareBazaar
Result
Malware family:
remcos
Create hunting rule
Score:
  10/10
Tags:
family:remcos botnet:administrator collection credential_access discovery rat spyware stealer
Link:
https://tria.ge/reports/250318-psyg6awqv9/
Behaviour
Checks processor information in registry
Enumerates system info in registry
Modifies data under HKEY_USERS
Modifies registry class
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
Suspicious use of WriteProcessMemory
System Location Discovery: System Language Discovery
Drops file in Program Files directory
Suspicious use of SetThreadContext
Accesses Microsoft Outlook accounts
Reads user/profile data of web browsers
Uses browser remote debugging
Detected Nirsoft tools
NirSoft MailPassView
NirSoft WebBrowserPassView
Remcos
Remcos family
Malware Config
C2 Extraction:
remyma.duckdns.org:52507
Verdict:
Malicious
Tags:
rat remcos Win.Trojan.Remcos-9841897-0
YARA:
malware_windows_remcos_rat REMCOS_RAT_variants Remcos_Payload win_remcos_rat_unpacked Windows_Trojan_Remcos_b296e965 MAL_EXE_Remcos_RAT_Jul_22 Remcos
Link:
https://app.threat.zone/submission/df6ac0ae-540b-4d7a-9e07-3b2b2d896656
Unpacked files
SH256 hash:
a21fb17320fb3f39015aeff2d22e3ab37eb2a11713f4fc99fbd6effc07635eae
MD5 hash:
caab871b33cb43f43a2c4aac12898f87
SHA1 hash:
b7daf8bff5a23637e68c9b626acaa3402bcbc6a2
Detections:
win_remcos_w0
Create hunting rule
win_remcos_auto
Create hunting rule
Remcos
Create hunting rule
Link:
https://www.unpac.me/results/dd65073c-258b-43a3-bd1e-c310f682d87a/
Malware family:
Remcos
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/a21fb17320fb/report/overview.html
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/a21fb17320fb3f39015aeff2d22e3ab37eb2a11713f4fc99fbd6effc07635eae

YARA Signatures

MalwareBazaar uses YARA rules from several public and non-public repositories, such as YARAhub and Malpedia. Those are being matched against malware samples uploaded to MalwareBazaar as well as against any suspicious process dumps they may create. Please note that only results from TLP:CLEAR rules are being displayed.

Rule name:cobalt_strike_tmp01925d3f
Create hunting rule
Author:The DFIR Report
Description:files - file ~tmp01925d3f.exe
Reference:https://thedfirreport.com
Rule name:DebuggerCheck__API
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:Disable_Defender
Create hunting rule
Author:iam-py-test
Description:Detect files disabling or modifying Windows Defender, Windows Firewall, or Microsoft Smartscreen
Rule name:golang_bin_JCorn_CSC846
Create hunting rule
Author:Justin Cornwell
Description:CSC-846 Golang detection ruleset
Rule name:INDICATOR_SUSPICIOUS_EXE_UACBypass_CMSTPCOM
Create hunting rule
Author:ditekSHen
Description:Detects Windows exceutables bypassing UAC using CMSTP COM interfaces. MITRE (T1218.003)
Rule name:pe_detect_tls_callbacks
Create hunting rule
Rule name:Remcos
Create hunting rule
Author:kevoreilly
Description:Remcos Payload
Rule name:REMCOS_RAT_variants
Create hunting rule
Rule name:Remcos_unpacked_PulseIntel
Create hunting rule
Author:PulseIntel
Description:Remcos Payload
Rule name:ThreadControl__Context
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:Windows_Trojan_Remcos_b296e965
Create hunting rule
Author:Elastic Security
Reference:https://www.elastic.co/security-labs/exploring-the-ref2731-intrusion-set
Rule name:win_remcos_auto
Create hunting rule
Author:Felix Bilstein - yara-signator at cocacoding dot com
Description:Detects win.remcos.
Rule name:win_remcos_rat_unpacked
Create hunting rule
Author:Matthew @ Embee_Research
Description:Detects strings present in remcos rat Samples.
Rule name:win_remcos_w0
Create hunting rule
Author:Matthew @ Embee_Research
Description:Detects strings present in remcos rat Samples.
Rule name:yarahub_win_remcos_rat_unpacked_aug_2023
Create hunting rule
Author:Matthew @ Embee_Research

File information

The table below shows additional information about this malware sample such as delivery method and external references.

BLint

The following table provides more information about this file using BLint. BLint is a Binary Linter to check the security properties, and capabilities in executables.

Findings
IDTitleSeverity
CHECK_AUTHENTICODEMissing Authenticodehigh
CHECK_DLL_CHARACTERISTICSMissing dll Security Characteristics (HIGH_ENTROPY_VA)high
CHECK_NXMissing Non-Executable Memory Protectioncritical
CHECK_PIEMissing Position-Independent Executable (PIE) Protectionhigh
Reviews
IDCapabilitiesEvidence
GDI_PLUS_APIInterfaces with Graphicsgdiplus.dll::GdiplusStartup
gdiplus.dll::GdipGetImageEncodersSize
gdiplus.dll::GdipGetImageEncoders
gdiplus.dll::GdipAlloc
MULTIMEDIA_APICan Play MultimediaWINMM.dll::mciSendStringA
WINMM.dll::mciSendStringW
WINMM.dll::PlaySoundW
WINMM.dll::waveInAddBuffer
WINMM.dll::waveInClose
WINMM.dll::waveInOpen
SECURITY_BASE_APIUses Security Base APIADVAPI32.dll::AdjustTokenPrivileges
ADVAPI32.dll::GetTokenInformation
SHELL_APIManipulates System ShellSHELL32.dll::ShellExecuteExA
SHELL32.dll::ShellExecuteW
URL_MONIKERS_APICan Download & Execute componentsurlmon.dll::URLDownloadToFileW
urlmon.dll::URLOpenBlockingStreamW
WIN32_PROCESS_APICan Create Process and ThreadsKERNEL32.dll::CreateProcessW
KERNEL32.dll::CreateProcessA
KERNEL32.dll::OpenProcess
ADVAPI32.dll::OpenProcessToken
KERNEL32.dll::WriteProcessMemory
KERNEL32.dll::CloseHandle
WININET.dll::InternetCloseHandle
WIN_BASE_APIUses Win Base APIKERNEL32.dll::TerminateProcess
KERNEL32.dll::FindFirstVolumeW
KERNEL32.dll::FindNextVolumeW
KERNEL32.dll::LoadLibraryA
KERNEL32.dll::LoadLibraryW
KERNEL32.dll::LoadLibraryExW
WIN_BASE_EXEC_APICan Execute other programsKERNEL32.dll::AllocConsole
KERNEL32.dll::WriteConsoleW
KERNEL32.dll::ReadConsoleW
KERNEL32.dll::SetConsoleOutputCP
KERNEL32.dll::SetConsoleTextAttribute
KERNEL32.dll::SetStdHandle
WIN_BASE_IO_APICan Create FilesKERNEL32.dll::CopyFileW
KERNEL32.dll::CreateDirectoryW
KERNEL32.dll::CreateFileW
KERNEL32.dll::DeleteFileW
KERNEL32.dll::DeleteFileA
KERNEL32.dll::MoveFileExW
KERNEL32.dll::MoveFileW
WIN_BASE_USER_APIRetrieves Account InformationADVAPI32.dll::GetUserNameW
ADVAPI32.dll::LookupPrivilegeValueA
KERNEL32.dll::QueryDosDeviceW
WIN_CRYPT_APIUses Windows Crypt APIADVAPI32.dll::CryptAcquireContextA
ADVAPI32.dll::CryptGenRandom
WIN_REG_APICan Manipulate Windows RegistryADVAPI32.dll::RegCreateKeyExW
ADVAPI32.dll::RegCreateKeyW
ADVAPI32.dll::RegCreateKeyA
ADVAPI32.dll::RegDeleteKeyA
ADVAPI32.dll::RegOpenKeyExA
ADVAPI32.dll::RegOpenKeyExW
WIN_SVC_APICan Manipulate Windows ServicesADVAPI32.dll::ChangeServiceConfigW
ADVAPI32.dll::ControlService
ADVAPI32.dll::OpenSCManagerW
ADVAPI32.dll::OpenSCManagerA
ADVAPI32.dll::OpenServiceW
ADVAPI32.dll::QueryServiceConfigW
WIN_USER_APIPerforms GUI ActionsUSER32.dll::AppendMenuA
USER32.dll::EmptyClipboard
USER32.dll::OpenClipboard
USER32.dll::CreateWindowExA

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