MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 a37a21d7760274f3fbe4ba574f8a5916722fe7c2adbf66e065cf05adc61bc9c4. 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: 13


Intelligence 13 IOCs YARA 4 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: a37a21d7760274f3fbe4ba574f8a5916722fe7c2adbf66e065cf05adc61bc9c4
SHA3-384 hash: 46e241ee7356164ce6485b00ef2289f7a6edbe8318ef78b5161643b049c18ef071fe1307462f4724499fb1c630c1e76b
SHA1 hash: cfa1548f8b547af19e46103212b08b43851517fe
MD5 hash: ef983e091438c06cef2ffeb1e7d54bc8
humanhash: tennis-leopard-vermont-spring
File name:ef983e091438c06cef2ffeb1e7d54bc8.exe
Download: download sample
Signature Stealc
Create hunting rule
File size:424'961 bytes
First seen:2024-04-22 15:55:41 UTC
Last seen:2024-04-22 16:34:50 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash 12f7de8a3c68b276aca25710ff68730e (11 x Stealc)
ssdeep 6144:+aNl9hsfxn6bIHo2ve4QrU2O/84Odz0f2kZ401ic9BJ/P:+aNXhKxwII2veXEIUBZD1BP
TLSH T18894F111B5FCECF2C52649354C67DAED692EB8625EB0868F73945A7F0F303D09622326
TrID 67.1% (.CPL) Windows Control Panel Item (generic) (57583/11/19)
12.2% (.EXE) Win64 Executable (generic) (10523/12/4)
5.8% (.EXE) Win16 NE executable (generic) (5038/12/1)
5.2% (.EXE) Win32 Executable (generic) (4504/4/1)
2.4% (.ICL) Windows Icons Library (generic) (2059/9)
File icon (PE):PE icon
dhash icon 64d29a9899a9a989 (5 x Stealc, 1 x Smoke Loader)
Reporter abuse_ch
Tags:exe Stealc


Avatar
abuse_ch
Stealc C2:
http://185.172.128.76/3cd2b41cbde8fc9c.php

Intelligence

File Origin
# of uploads :
2
# of downloads :
317
Origin country :
NL NL
Vendor Threat Intelligence
Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
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
DNS request
Connection attempt
Sending an HTTP GET request
Creating a window
Searching for synchronization primitives
Creating a file
Connecting to a non-recommended domain
Launching the default Windows debugger (dwwin.exe)
Sending an HTTP POST request
Running batch commands
Creating a process with a hidden window
Launching a process
Transferring files using the Background Intelligent Transfer Service (BITS)
Sending a custom TCP request
Connection attempt to an infection source
Verdict:
No Threat
Threat level:
  10/10
Confidence:
100%
Tags:
fingerprint overlay
Link:
https://www.filescan.io/uploads/6626889651edb67852f7feac/reports/ecd3dfa0-eb79-4702-a61f-5159f1dc77d9/overview
Verdict:
Malicious
Labled as:
Malware
Link:
https://www.hybrid-analysis.com/sample/a37a21d7760274f3fbe4ba574f8a5916722fe7c2adbf66e065cf05adc61bc9c4
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/bd2facfd-71c3-49f8-b306-10433ad950da
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/1429796
Signature
.NET source code contains method to dynamically call methods (often used by packers)
.NET source code contains potential unpacker
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)
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: 1429796 Sample: 22biblH3Ks.exe Startdate: 22/04/2024 Architecture: WINDOWS Score: 100 39 westus2-2.in.applicationinsights.azure.com 2->39 41 westus2-2.in.ai.privatelink.monitor.azure.com 2->41 43 3 other IPs or domains 2->43 55 Snort IDS alert for network traffic 2->55 57 Found malware configuration 2->57 59 Malicious sample detected (through community Yara rule) 2->59 61 12 other signatures 2->61 8 22biblH3Ks.exe 1 3 2->8         started        signatures3 process4 dnsIp5 45 185.172.128.90, 49705, 80 NADYMSS-ASRU Russian Federation 8->45 47 185.172.128.228, 49706, 49709, 80 NADYMSS-ASRU Russian Federation 8->47 49 2 other IPs or domains 8->49 27 C:\Users\user\AppData\Local\Temp\u11s.1.exe, PE32 8->27 dropped 29 C:\Users\user\AppData\Local\Temp\u11s.0.exe, PE32 8->29 dropped 69 Detected unpacking (changes PE section rights) 8->69 71 Detected unpacking (overwrites its own PE header) 8->71 13 u11s.0.exe 76 8->13         started        18 u11s.1.exe 10 8 8->18         started        20 WerFault.exe 19 16 8->20         started        file6 signatures7 process8 dnsIp9 51 185.172.128.76, 49710, 80 NADYMSS-ASRU Russian Federation 13->51 31 C:\Users\user\AppData\...\softokn3[1].dll, PE32 13->31 dropped 33 C:\Users\user\AppData\Local\...\nss3[1].dll, PE32 13->33 dropped 35 C:\Users\user\AppData\...\mozglue[1].dll, PE32 13->35 dropped 37 9 other files (5 malicious) 13->37 dropped 73 Multi AV Scanner detection for dropped file 13->73 75 Detected unpacking (changes PE section rights) 13->75 77 Detected unpacking (overwrites its own PE header) 13->77 81 9 other signatures 13->81 22 WerFault.exe 13->22         started        53 svc.iolo.com 20.157.87.45, 49711, 49733, 80 MICROSOFT-CORP-MSN-AS-BLOCKUS United States 18->53 79 Checks if the current machine is a virtual machine (disk enumeration) 18->79 24 SystemMechanic_5488CB36-BE62-4606-B07B-2EE938868BD1.exe 14 10 18->24         started        file10 signatures11 process12 signatures13 63 Queries sensitive video device information (via WMI, Win32_VideoController, often done to detect virtual machines) 24->63 65 Queries sensitive disk information (via WMI, Win32_DiskDrive, often done to detect virtual machines) 24->65 67 Queries sensitive service information (via WMI, Win32_LogicalDisk, often done to detect sandboxes) 24->67
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/a37a21d7760274f3fbe4ba574f8a5916722fe7c2adbf66e065cf05adc61bc9c4
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/a37a21d7760274f3fbe4ba574f8a5916722fe7c2adbf66e065cf05adc61bc9c4/
Threat name:
Win32.Ransomware.StopCrypt
Create hunting rule
Status:
Malicious
First seen:
2024-04-22 15:56:05 UTC
File Type:
PE (Exe)
Extracted files:
32
AV detection:
20 of 24 (83.33%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=un5cdv3waj2ph67exjlu7cszczzc7z6cvw7wnydfz4c23rq3zhca._file
Verdict:
malicious
Result
Malware family:
zgrat
Create hunting rule
Score:
  10/10
Tags:
family:stealc family:zgrat rat stealer
Link:
https://tria.ge/reports/240422-tdbr3adb25/
Behaviour
Checks SCSI registry key(s)
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
Checks computer location settings
Executes dropped EXE
Loads dropped DLL
Downloads MZ/PE file
Detect ZGRat V1
Stealc
ZGRat
Unpacked files
SH256 hash:
a1ff96ad65a9ead5053b1de9ed94a03ff792cb4f39d84e3123f62ab22fb71e29
MD5 hash:
37862a13464da087a12b6b45fe34f9fe
SHA1 hash:
9214969d475793f2647cbea48760f29998c907d5
Link:
https://www.unpac.me/results/705bc2c2-8982-4323-b8c1-52d07c9ac9ef/
SH256 hash:
a37a21d7760274f3fbe4ba574f8a5916722fe7c2adbf66e065cf05adc61bc9c4
MD5 hash:
ef983e091438c06cef2ffeb1e7d54bc8
SHA1 hash:
cfa1548f8b547af19e46103212b08b43851517fe
Link:
https://www.unpac.me/results/705bc2c2-8982-4323-b8c1-52d07c9ac9ef/
Malware family:
Stealc
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/a37a21d77602/report/overview.html
Please note that we are no longer able to provide a coverage score for Virus Total.

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:DebuggerCheck__API
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:maldoc_find_kernel32_base_method_1
Create hunting rule
Author:Didier Stevens (https://DidierStevens.com)
Rule name:Windows_Trojan_Generic_2993e5a5
Create hunting rule
Author:Elastic Security

File information

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

Web download

Stealc

Executable exe a37a21d7760274f3fbe4ba574f8a5916722fe7c2adbf66e065cf05adc61bc9c4

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/2804603/
  
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_NXMissing Non-Executable Memory Protectioncritical
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::FindNextVolumeW
KERNEL32.dll::SetFirmwareEnvironmentVariableA
KERNEL32.dll::LoadLibraryW
KERNEL32.dll::LoadLibraryA
KERNEL32.dll::GetVolumeInformationW
WIN_BASE_EXEC_APICan Execute other programsKERNEL32.dll::WriteConsoleA
KERNEL32.dll::WriteConsoleW
KERNEL32.dll::SetConsoleDisplayMode
KERNEL32.dll::SetConsoleTitleW
KERNEL32.dll::SetStdHandle
KERNEL32.dll::GetConsoleAliasesLengthA
KERNEL32.dll::GetConsoleAliasExesLengthW
KERNEL32.dll::GetConsoleCP
KERNEL32.dll::GetConsoleMode
KERNEL32.dll::GetConsoleOutputCP
WIN_BASE_IO_APICan Create FilesKERNEL32.dll::CreateFileA
WIN_BASE_USER_APIRetrieves Account InformationKERNEL32.dll::GetComputerNameW

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