MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 4d4b203f72413a42a31be62977b8a6508e7f04f9192913c432ab456b15fc3004. 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: 17


Intelligence 17 IOCs YARA 19 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 4d4b203f72413a42a31be62977b8a6508e7f04f9192913c432ab456b15fc3004
SHA3-384 hash: 75dbe5b864dfb5346361bb60a23817d32225c7302ced2569279a3df5adc3ced79f5b238e452cb8be2e77a44e90ced1c2
SHA1 hash: a79848e3b77e0e995dbc1b87c1a82b00bf4827eb
MD5 hash: 416df385ee8cc5b57c5869cff2142747
humanhash: gee-foxtrot-venus-jig
File name:FRSSDE.exe
Download: download sample
Signature RemcosRAT
Create hunting rule
File size:493'056 bytes
First seen:2024-11-18 15:39:43 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash e77512f955eaf60ccff45e02d69234de (138 x RemcosRAT)
ssdeep 12288:LuD09AUkNIGBYYv4eK13x13nZHSRVMf139F5wIB7+IwtHwBtVxbesvZDSx+DY:O09AfNIEYsunZvZ19Z6s
Threatray 51 similar samples on MalwareBazaar
TLSH T1C3A4BF01B6D2C072D57625300D26E775DEBDBD212835897BB3DA1D67FE30180E63AAB2
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
File icon (PE):PE icon
dhash icon c4d48eaa8ad4d4f8 (1'000 x RemcosRAT, 1 x Worm.Ramnit, 1 x Vjw0rm)
Reporter pr0xylife
Tags:exe RemcosRAT

Intelligence

File Origin
# of uploads :
1
# of downloads :
469
Origin country :
DE DE
Vendor Threat Intelligence
Malware family:
remcos
Create hunting rule
ID:
1
File name:
FRSSDE.exe
Verdict:
Malicious activity
Analysis date:
2024-11-18 15:43:52 UTC
Tags:
rat remcos remote evasion mpress
Link:
https://app.any.run/tasks/c02979fa-fc14-41cb-8ceb-9d7a095f91a6

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection(s):
Win.Trojan.Remcos-9841897-0
Create hunting rule

Win.Trojan.Remcos-10002580-0
Create hunting rule

Verdict:
Malicious
Score:
99.9%
Link:
https://cyber-fortress.com/docs/result/index.php?id=673b610c5107a56eacc7894e
Tags:
dropper remcos packed sage
Result
Verdict:
Malware
Maliciousness:

Behaviour
Сreating synchronization primitives
DNS request
Connection attempt
Sending a custom TCP request
Sending an HTTP GET request
Unauthorized injection to a recently created process
Restart of the analyzed sample
Creating a file in the %temp% subdirectories
Reading critical registry keys
Creating a file
Stealing user critical data
Verdict:
Malicious
Labled as:
Remcos.Generic
Link:
https://www.hybrid-analysis.com/sample/4d4b203f72413a42a31be62977b8a6508e7f04f9192913c432ab456b15fc3004
Malware family:
REMCOS
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/3f6ba468-ae76-44ec-8290-9037c2c518e2
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/1557798
Signature
AI detected suspicious sample
Antivirus / Scanner detection for submitted sample
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
Delayed program exit found
Detected Remcos RAT
Detected unpacking (changes PE section rights)
Found malware configuration
Machine Learning detection for sample
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for submitted file
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
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: 1557798 Sample: FRSSDE.exe Startdate: 18/11/2024 Architecture: WINDOWS Score: 100 38 nextnewupdationsforu.duckdns.org 2->38 40 geoplugin.net 2->40 62 Suricata IDS alerts for network traffic 2->62 64 Found malware configuration 2->64 66 Malicious sample detected (through community Yara rule) 2->66 70 9 other signatures 2->70 8 FRSSDE.exe 3 26 2->8         started        12 msedge.exe 67 387 2->12         started        signatures3 68 Uses dynamic DNS services 38->68 process4 dnsIp5 52 nextnewupdationsforu.duckdns.org 192.227.228.36, 14645, 63318, 63319 AS-COLOCROSSINGUS United States 8->52 54 geoplugin.net 178.237.33.50, 63321, 80 ATOM86-ASATOM86NL Netherlands 8->54 56 127.0.0.1 unknown unknown 8->56 72 Contains functionality to bypass UAC (CMSTPLUA) 8->72 74 Detected unpacking (changes PE section rights) 8->74 76 Detected Remcos RAT 8->76 78 9 other signatures 8->78 14 FRSSDE.exe 1 8->14         started        17 FRSSDE.exe 1 8->17         started        19 FRSSDE.exe 2 8->19         started        29 2 other processes 8->29 21 msedge.exe 12->21         started        25 msedge.exe 12->25         started        27 msedge.exe 12->27         started        signatures6 process7 dnsIp8 80 Tries to steal Instant Messenger accounts or passwords 14->80 82 Tries to steal Mail credentials (via file / registry access) 14->82 84 Tries to harvest and steal browser information (history, passwords, etc) 17->84 42 13.107.246.57, 443, 63504, 63508 MICROSOFT-CORP-MSN-AS-BLOCKUS United States 21->42 44 20.125.209.212, 443, 63485 MICROSOFT-CORP-MSN-AS-BLOCKUS United States 21->44 50 20 other IPs or domains 21->50 36 C:\Users\user\AppData\Local\...\Cookies, SQLite 21->36 dropped 46 192.168.2.7, 123, 138, 14645 unknown unknown 29->46 48 239.255.255.250 unknown Reserved 29->48 31 chrome.exe 29->31         started        34 msedge.exe 29->34         started        file9 signatures10 process11 dnsIp12 58 googlehosted.l.googleusercontent.com 142.250.185.65, 443, 63373 GOOGLEUS United States 31->58 60 clients2.googleusercontent.com 31->60
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/4d4b203f72413a42a31be62977b8a6508e7f04f9192913c432ab456b15fc3004
Detection:
remcos
Create hunting rule
Link:
https://mwdb.cert.pl/sample/4d4b203f72413a42a31be62977b8a6508e7f04f9192913c432ab456b15fc3004/
Threat name:
Win32.Backdoor.Remcos
Create hunting rule
Status:
Malicious
First seen:
2024-11-18 15:40:05 UTC
File Type:
PE (Exe)
Extracted files:
8
AV detection:
20 of 24 (83.33%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=jvfsap3sie5efiy34yuxpofgkchh6bhzdeurhrbsvncwwfp4gaca._file
Verdict:
malicious
Label(s):
remcos
Create hunting rule
Similar samples:
0d4bf4e1a47fa2cfdb5cdc23d8a2b1552c1d82c307e1eec95297e62a478d2f2d
RemcosRAT
4d4b203f72413a42a31be62977b8a6508e7f04f9192913c432ab456b15fc3004
RemcosRAT
958e5d7947f48f2047ac3c595ee724a916c9969430731091ac1b9fcfaaf65d70
RemcosRAT
ae7dd99d6214b35fe4d225dd782ca41714ffd0b637d8db40fbb887e00807d288
RemcosRAT
c865fc0e856370e94724131a1ae04b852d6e4b98d7060a1e702b7ff933ac947b
RemcosRAT
dcbcfe00290d92cfea7ff37d322cf80991016d6379888cdaf27451c6543a894c
RemcosRAT
e38472a309a8c98d56f4d3384be87b4f619f93c8af02ca9c08236e20987b380c
RemcosRAT
error
RemcosRAT
+ 41 additional samples on MalwareBazaar
Result
Malware family:
remcos
Create hunting rule
Score:
  10/10
Tags:
family:remcos botnet:remotehost collection credential_access discovery spyware stealer
Link:
https://tria.ge/reports/241118-s364tsvkcj/
Behaviour
Enumerates system info in registry
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
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
Malware Config
C2 Extraction:
nextnewupdationsforu.duckdns.org:14645
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/2fe9cf27-3308-4956-b3b4-ee723105d943
Unpacked files
SH256 hash:
4d4b203f72413a42a31be62977b8a6508e7f04f9192913c432ab456b15fc3004
MD5 hash:
416df385ee8cc5b57c5869cff2142747
SHA1 hash:
a79848e3b77e0e995dbc1b87c1a82b00bf4827eb
Detections:
Remcos
Create hunting rule
win_remcos_auto
Create hunting rule
win_remcos_w0
Create hunting rule
Link:
https://www.unpac.me/results/d31a8199-cb3f-4305-953c-b8e5f131a2aa/
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/4d4b203f72413a42a31be62977b8a6508e7f04f9192913c432ab456b15fc3004

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:iexplorer_remcos
Create hunting rule
Author:iam-py-test
Description:Detect iexplorer being taken over by Remcos
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:RansomPyShield_Antiransomware
Create hunting rule
Author:XiAnzheng
Description:Check for malicious import combination that ransomware mostly use(can create FP)
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::GdipGetImageEncoders
gdiplus.dll::GdipGetImageEncodersSize
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
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::LoadLibraryExW
KERNEL32.dll::GetDriveTypeA
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::RegCreateKeyA
ADVAPI32.dll::RegCreateKeyExW
ADVAPI32.dll::RegCreateKeyW
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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