MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 81b64ff8f989f5a498e306b5f6f08e92b1d2d0a3c4bfc73b464f257783152c83. 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


Stealc


Vendor detections: 15


Intelligence 15 IOCs YARA 4 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 81b64ff8f989f5a498e306b5f6f08e92b1d2d0a3c4bfc73b464f257783152c83
SHA3-384 hash: 0ffc28933901ea9e2cc4ad92b5b71e7d4633aa4f5f4ca165b4949f4c4154ed397ce79788c173c43f9e83200eb2b2b3f6
SHA1 hash: 8b5d5d4c508106c9958fb33116e8b4eac9e4df8a
MD5 hash: 1c9f7a7f37ed9143b8cbefe285b96419
humanhash: october-spring-nebraska-illinois
File name:1c9f7a7f37ed9143b8cbefe285b96419.exe
Download: download sample
Signature Stealc
Create hunting rule
File size:419'841 bytes
First seen:2024-04-02 18:23:48 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash c4a60923dba9ba09eab802a43aae91ba (1 x LummaStealer, 1 x Stealc)
ssdeep 6144:6vZFT3XcbbLvNeULGRvdEvUkiHDdBonjSdwn6O9F2AiX:6vZFT3MvLH+GUB4jQwn6wF25X
TLSH T1A4949C03A2D1BC61E5664773BF2E9AEC372EF9615E286B6722487E0F54B00B0D253753
TrID 34.5% (.CPL) Windows Control Panel Item (generic) (57583/11/19)
25.8% (.EXE) InstallShield setup (43053/19/16)
18.7% (.EXE) Win32 Executable MS Visual C++ (generic) (31206/45/13)
6.3% (.EXE) Win64 Executable (generic) (10523/12/4)
3.9% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
File icon (PE):PE icon
dhash icon 0030409010301000 (1 x Stealc)
Reporter abuse_ch
Tags:exe Stealc

Intelligence

File Origin
# of uploads :
1
# of downloads :
330
Origin country :
NL NL
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
81b64ff8f989f5a498e306b5f6f08e92b1d2d0a3c4bfc73b464f257783152c83.exe
Verdict:
Malicious activity
Analysis date:
2024-04-02 18:29:11 UTC
Tags:
loader stealer stealc
Link:
https://app.any.run/tasks/ee76b0bb-88d5-488b-bcf3-8eec278ca9ef

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Result
Verdict:
Malware
Maliciousness:

Behaviour
Sending an HTTP GET request to an infection source
Creating a file in the %temp% directory
Сreating synchronization primitives
Creating a process from a recently created file
Launching the default Windows debugger (dwwin.exe)
Creating a window
Searching for synchronization primitives
Creating a file
DNS request
Connecting to a non-recommended domain
Connection attempt
Sending an HTTP POST request
Searching for the window
Transferring files using the Background Intelligent Transfer Service (BITS)
Sending a custom TCP request
Enabling the 'hidden' option for files in the %temp% directory
Moving a recently created file
Connection attempt to an infection source
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
fingerprint overlay packed
Link:
https://www.filescan.io/uploads/660c4d48bb285b5db05532df/reports/07966448-331f-48ca-bb67-cdca88d8bc13/overview
Verdict:
Malicious
Labled as:
Malware
Link:
https://www.hybrid-analysis.com/sample/81b64ff8f989f5a498e306b5f6f08e92b1d2d0a3c4bfc73b464f257783152c83
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:
Stealc
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/bb7beadb-d9b6-4693-9f24-0cc51bc4971b
Result
Threat name:
Mars Stealer, PureLog Stealer, Stealc, V
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1418973
Signature
.NET source code contains method to dynamically call methods (often used by packers)
Antivirus / Scanner detection for submitted sample
Antivirus detection for dropped file
Antivirus detection for URL or domain
C2 URLs / IPs found in malware configuration
Checks if the current machine is a virtual machine (disk enumeration)
Detected unpacking (changes PE section rights)
Detected unpacking (overwrites its own PE header)
Found evasive API chain (may stop execution after checking locale)
Found malware configuration
Found many strings related to Crypto-Wallets (likely being stolen)
Machine Learning detection for dropped file
Machine Learning detection for sample
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Queries sensitive disk information (via WMI, Win32_DiskDrive, often done to detect virtual machines)
Queries sensitive service information (via WMI, Win32_LogicalDisk, often done to detect sandboxes)
Queries sensitive video device information (via WMI, Win32_VideoController, often done to detect virtual machines)
Sample uses string decryption to hide its real strings
Searches for specific processes (likely to inject)
Snort IDS alert for network traffic
Tries to harvest and steal Bitcoin Wallet information
Tries to harvest and steal browser information (history, passwords, etc)
Tries to harvest and steal ftp login credentials
Tries to steal Crypto Currency Wallets
Tries to steal Mail credentials (via file / registry access)
Uses ping.exe to check the status of other devices and networks
Uses ping.exe to sleep
Yara detected Generic Downloader
Yara detected Mars stealer
Yara detected PureLog Stealer
Yara detected Stealc
Yara detected Vidar stealer
Yara detected zgRAT
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1418973 Sample: Pe5Tdm4QOQ.exe Startdate: 02/04/2024 Architecture: WINDOWS Score: 100 61 westus2-2.in.applicationinsights.azure.com 2->61 63 westus2-2.in.ai.privatelink.monitor.azure.com 2->63 65 2 other IPs or domains 2->65 89 Snort IDS alert for network traffic 2->89 91 Found malware configuration 2->91 93 Malicious sample detected (through community Yara rule) 2->93 95 15 other signatures 2->95 11 Pe5Tdm4QOQ.exe 1 3 2->11         started        signatures3 process4 dnsIp5 69 185.172.128.90, 49699, 80 NADYMSS-ASRU Russian Federation 11->69 71 185.172.128.144, 49702, 80 NADYMSS-ASRU Russian Federation 11->71 73 185.172.128.65, 49700, 49701, 49733 NADYMSS-ASRU Russian Federation 11->73 53 C:\Users\user\AppData\Local\Temp\u4g0.1.exe, PE32 11->53 dropped 55 C:\Users\user\AppData\Local\Temp\u4g0.0.exe, PE32 11->55 dropped 109 Detected unpacking (changes PE section rights) 11->109 111 Detected unpacking (overwrites its own PE header) 11->111 16 u4g0.0.exe 59 11->16         started        21 u4g0.1.exe 10 8 11->21         started        23 WerFault.exe 21 16 11->23         started        file6 signatures7 process8 dnsIp9 57 185.172.128.209, 49703, 80 NADYMSS-ASRU Russian Federation 16->57 45 C:\Users\user\AppData\...\KFIIJJJDGC.exe, PE32 16->45 dropped 47 C:\Users\user\AppData\...\softokn3[1].dll, PE32 16->47 dropped 49 C:\Users\user\AppData\Local\...\nss3[1].dll, PE32 16->49 dropped 51 11 other files (7 malicious) 16->51 dropped 79 Antivirus detection for dropped file 16->79 81 Detected unpacking (changes PE section rights) 16->81 83 Detected unpacking (overwrites its own PE header) 16->83 87 9 other signatures 16->87 25 cmd.exe 16->25         started        28 WerFault.exe 16->28         started        59 svc.iolo.com 20.157.87.45, 49704, 49725, 80 MICROSOFT-CORP-MSN-AS-BLOCKUS United States 21->59 85 Checks if the current machine is a virtual machine (disk enumeration) 21->85 30 SystemMechanic_5488CB36-BE62-4606-B07B-2EE938868BD1.exe 11 21->30         started        file10 signatures11 process12 signatures13 99 Uses ping.exe to sleep 25->99 101 Uses ping.exe to check the status of other devices and networks 25->101 32 KFIIJJJDGC.exe 25->32         started        35 conhost.exe 25->35         started        103 Queries sensitive video device information (via WMI, Win32_VideoController, often done to detect virtual machines) 30->103 105 Queries sensitive disk information (via WMI, Win32_DiskDrive, often done to detect virtual machines) 30->105 107 Queries sensitive service information (via WMI, Win32_LogicalDisk, often done to detect sandboxes) 30->107 process14 signatures15 75 Antivirus detection for dropped file 32->75 77 Multi AV Scanner detection for dropped file 32->77 37 cmd.exe 32->37         started        process16 signatures17 97 Uses ping.exe to sleep 37->97 40 PING.EXE 37->40         started        43 conhost.exe 37->43         started        process18 dnsIp19 67 2.2.2.2 FranceTelecom-OrangeFR France 40->67
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/81b64ff8f989f5a498e306b5f6f08e92b1d2d0a3c4bfc73b464f257783152c83
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/81b64ff8f989f5a498e306b5f6f08e92b1d2d0a3c4bfc73b464f257783152c83/
Threat name:
Win32.Trojan.Smokeloader
Create hunting rule
Status:
Malicious
First seen:
2024-04-01 08:53:35 UTC
File Type:
PE (Exe)
Extracted files:
35
AV detection:
22 of 24 (91.67%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=qg3e76hzrh22jghda227n4eosky5fufdys74oo2gj4sxpayvfsbq._file
Verdict:
malicious
Result
Malware family:
zgrat
Create hunting rule
Score:
  10/10
Tags:
family:stealc family:zgrat discovery rat spyware stealer
Link:
https://tria.ge/reports/240402-w112kshf2w/
Behaviour
Checks SCSI registry key(s)
Checks processor information in registry
Runs ping.exe
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
Suspicious use of SendNotifyMessage
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Program crash
Accesses cryptocurrency files/wallets, possible credential harvesting
Checks installed software on the system
Checks computer location settings
Executes dropped EXE
Loads dropped DLL
Reads data files stored by FTP clients
Reads user/profile data of web browsers
Downloads MZ/PE file
Detect ZGRat V1
Stealc
ZGRat
Malware Config
C2 Extraction:
http://185.172.128.209
Unpacked files
SH256 hash:
929c311d58965ae456d96ca118fb7fcabf98699e02d30e0913ddf08a06e8d0c4
MD5 hash:
08aaaa25ef78eff19a96c02905e84004
SHA1 hash:
6940d4f0b6426d28d6f6821c2d531343eedb121d
Link:
https://www.unpac.me/results/1f54a138-43fd-4d50-b4b6-3f3ebba095d1/
SH256 hash:
81b64ff8f989f5a498e306b5f6f08e92b1d2d0a3c4bfc73b464f257783152c83
MD5 hash:
1c9f7a7f37ed9143b8cbefe285b96419
SHA1 hash:
8b5d5d4c508106c9958fb33116e8b4eac9e4df8a
Link:
https://www.unpac.me/results/1f54a138-43fd-4d50-b4b6-3f3ebba095d1/
Malware family:
Stealc
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/81b64ff8f989/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/81b64ff8f989f5a498e306b5f6f08e92b1d2d0a3c4bfc73b464f257783152c83

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:BitcoinAddress
Create hunting rule
Author:Didier Stevens (@DidierStevens)
Description:Contains a valid Bitcoin address
Rule name:DebuggerCheck__API
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:EXE_Stealer_StealC_Feb2024
Create hunting rule
Author:Yashraj Solanki - Cyber Threat Intelligence Analyst at Bridewell
Rule name:ThreadControl__Context
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara

File information

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

Web download

Stealc

Executable exe 81b64ff8f989f5a498e306b5f6f08e92b1d2d0a3c4bfc73b464f257783152c83

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/2796247/
  
Delivery method
Distributed via web download

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_PIEMissing Position-Independent Executable (PIE) Protectionhigh
Reviews
IDCapabilitiesEvidence
WIN32_PROCESS_APICan Create Process and ThreadsKERNEL32.dll::CloseHandle
WIN_BASE_APIUses Win Base APIKERNEL32.dll::TerminateProcess
KERNEL32.dll::FindFirstVolumeMountPointW
KERNEL32.dll::FindNextVolumeW
KERNEL32.dll::LoadLibraryA
KERNEL32.dll::LoadLibraryExW
KERNEL32.dll::GetVolumeInformationA
WIN_BASE_EXEC_APICan Execute other programsKERNEL32.dll::WriteConsoleW
KERNEL32.dll::ReadConsoleW
KERNEL32.dll::ReadConsoleInputA
KERNEL32.dll::SetStdHandle
KERNEL32.dll::GetConsoleAliasesLengthW
KERNEL32.dll::GetConsoleAliasA
KERNEL32.dll::GetConsoleCP
KERNEL32.dll::GetConsoleMode
WIN_BASE_IO_APICan Create FilesKERNEL32.dll::CreateFileA
KERNEL32.dll::CreateFileW
KERNEL32.dll::MoveFileWithProgressA
KERNEL32.dll::GetWindowsDirectoryW
KERNEL32.dll::RemoveDirectoryW
WIN_BASE_USER_APIRetrieves Account InformationKERNEL32.dll::QueryDosDeviceA
WIN_HTTP_APIUses HTTP servicesWINHTTP.dll::WinHttpSetDefaultProxyConfiguration

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