MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 666d91620d589b16b55f847c0c84396419461844d9ab844ad39a7df9d88c34e5. 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


UmbralStealer


Vendor detections: 15


Intelligence 15 IOCs YARA 6 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 666d91620d589b16b55f847c0c84396419461844d9ab844ad39a7df9d88c34e5
SHA3-384 hash: 2ef5ca2a6b2781e781b07aac86b7bc846353e5365a84584efb42cc1c4037d663beb95fcc01a986b81041804a7f6b3b12
SHA1 hash: 03822545415f9dc69207495898c706c0d8340807
MD5 hash: 9fa71bd01a54e0726de72e272bcbe6eb
humanhash: cardinal-sink-salami-fix
File name:9fa71bd01a54e0726de72e272bcbe6eb.exe
Download: download sample
Signature UmbralStealer
Create hunting rule
File size:1'375'744 bytes
First seen:2024-12-13 16:49:27 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'652 x AgentTesla, 19'463 x Formbook, 12'204 x SnakeKeylogger)
ssdeep 24576:x0kpqP4E3+rAOymAfu86lJ5qKYv8aIlbRnxYUsNV/qXOlY/nZZMR:kwKcATbG8TKrOlNxqXTvMR
TLSH T1A755CF2BB6C6CCB1F5535776C4C7212043B0D5A577BBFA1B3A4A23AA19637A6CCC2107
TrID 71.1% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13)
10.2% (.EXE) Win64 Executable (generic) (10522/11/4)
6.3% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
4.3% (.EXE) Win32 Executable (generic) (4504/4/1)
2.0% (.ICL) Windows Icons Library (generic) (2059/9)
Magika pebin
Reporter abuse_ch
Tags:exe RAT UmbralStealer

Intelligence

File Origin
# of uploads :
1
# of downloads :
431
Origin country :
NL NL
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
9fa71bd01a54e0726de72e272bcbe6eb.exe
Verdict:
Malicious activity
Analysis date:
2024-12-13 16:59:38 UTC
Tags:
purecrypter netreactor
Link:
https://app.any.run/tasks/2a6381b0-f216-45de-b45d-65455eae1b96

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Malicious
Score:
97.4%
Link:
https://cyber-fortress.com/docs/result/index.php?id=675c6846653a8698dfc314c3
Tags:
autorun umbra
Result
Verdict:
Malware
Maliciousness:

Behaviour
Сreating synchronization primitives
Running batch commands
Creating a process with a hidden window
Launching a process
Sending a UDP request
Creating a file
Enabling autorun by creating a file
Unauthorized injection to a system process
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
net_reactor obfuscated packed packed packer_detected
Link:
https://www.filescan.io/uploads/675c65bd7fd0f454f845e63c/reports/c3f1f104-a74b-4d1f-bebe-2fd1bdf79215/overview
Verdict:
Malicious
Labled as:
Win/malicious_confidence_100%
Link:
https://www.hybrid-analysis.com/sample/666d91620d589b16b55f847c0c84396419461844d9ab844ad39a7df9d88c34e5
Result
Verdict:
SUSPICIOUS
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:
Agent Tesla
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/5b8fe840-66e9-405e-9ef8-aada36b7d2a4
Result
Threat name:
Blank Grabber, Umbral Stealer
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1574867
Signature
.NET source code contains potential unpacker
AI detected suspicious sample
C2 URLs / IPs found in malware configuration
Drops VBS files to the startup folder
Encrypted powershell cmdline option found
Found malware configuration
Found many strings related to Crypto-Wallets (likely being stolen)
Injects a PE file into a foreign processes
Loading BitLocker PowerShell Module
Machine Learning detection for dropped file
Machine Learning detection for sample
Malicious sample detected (through community Yara rule)
Modifies Windows Defender protection settings
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Obfuscated command line found
Sigma detected: Drops script at startup location
Sigma detected: Invoke-Obfuscation CLIP+ Launcher
Sigma detected: Invoke-Obfuscation VAR+ Launcher
Sigma detected: Powershell Base64 Encoded MpPreference Cmdlet
Sigma detected: WScript or CScript Dropper
Suspicious execution chain found
Suspicious powershell command line found
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Uses ipconfig to lookup or modify the Windows network settings
Windows Scripting host queries suspicious COM object (likely to drop second stage)
Writes to foreign memory regions
Yara detected AntiVM3
Yara detected Blank Grabber
Yara detected Costura Assembly Loader
Yara detected Umbral Stealer
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 1574867 Sample: 8aKOgl2Ype.exe Startdate: 13/12/2024 Architecture: WINDOWS Score: 100 61 Found malware configuration 2->61 63 Malicious sample detected (through community Yara rule) 2->63 65 Multi AV Scanner detection for submitted file 2->65 67 13 other signatures 2->67 8 8aKOgl2Ype.exe 6 2->8         started        12 wscript.exe 1 2->12         started        process3 file4 55 C:\Users\user\AppData\Local\update.exe, PE32 8->55 dropped 57 C:\Users\user\AppData\Roaming\...\update.vbs, ASCII 8->57 dropped 59 C:\Users\user\...\update.exe:Zone.Identifier, ASCII 8->59 dropped 69 Suspicious powershell command line found 8->69 71 Obfuscated command line found 8->71 73 Found many strings related to Crypto-Wallets (likely being stolen) 8->73 79 6 other signatures 8->79 14 powershell.exe 23 8->14         started        17 cmd.exe 1 8->17         started        19 cmd.exe 1 8->19         started        23 2 other processes 8->23 75 Windows Scripting host queries suspicious COM object (likely to drop second stage) 12->75 77 Suspicious execution chain found 12->77 21 update.exe 12->21         started        signatures5 process6 signatures7 81 Loading BitLocker PowerShell Module 14->81 37 2 other processes 14->37 83 Uses ipconfig to lookup or modify the Windows network settings 17->83 39 2 other processes 17->39 41 2 other processes 19->41 85 Multi AV Scanner detection for dropped file 21->85 87 Suspicious powershell command line found 21->87 89 Obfuscated command line found 21->89 91 4 other signatures 21->91 25 cmd.exe 21->25         started        27 cmd.exe 21->27         started        29 powershell.exe 21->29         started        31 AppLaunch.exe 21->31         started        33 AppLaunch.exe 23->33         started        35 conhost.exe 23->35         started        process8 process9 43 conhost.exe 25->43         started        45 ipconfig.exe 25->45         started        47 conhost.exe 27->47         started        49 ipconfig.exe 27->49         started        51 conhost.exe 29->51         started        53 AppLaunch.exe 31->53         started       
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/666d91620d589b16b55f847c0c84396419461844d9ab844ad39a7df9d88c34e5
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/666d91620d589b16b55f847c0c84396419461844d9ab844ad39a7df9d88c34e5/
Threat name:
ByteCode-MSIL.Infostealer.Tinba
Create hunting rule
Status:
Malicious
First seen:
2024-12-13 12:56:09 UTC
File Type:
PE (.Net Exe)
Extracted files:
3
AV detection:
17 of 24 (70.83%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=mzwzcyqnlcnrnnk7qr6azbbzmqmumgce3gvyiswttj67twemgtsq._file
Result
Malware family:
umbral
Create hunting rule
Score:
  10/10
Tags:
family:umbral discovery execution stealer
Link:
https://tria.ge/reports/241213-vb9rravlas/
Behaviour
Detects videocard installed
Gathers network information
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Program crash
System Location Discovery: System Language Discovery
Suspicious use of SetThreadContext
Legitimate hosting services abused for malware hosting/C2
Looks up external IP address via web service
Checks computer location settings
Drops startup file
Command and Scripting Interpreter: PowerShell
Detect Umbral payload
Suspicious use of NtCreateUserProcessOtherParentProcess
Umbral
Umbral family
Verdict:
Suspicious
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/f7d92806-e681-40cd-b0a2-5a42a19b9c4e
Unpacked files
SH256 hash:
44ad5777fd004992ae1f2e5a46f100d37b242f1e9e2f200e6b75c40ce8002b98
MD5 hash:
4b8893fe5faacaa6b29679b2ac738c42
SHA1 hash:
f7a1cdc014094b5a81e133927bdadc6218da37f9
Detections:
SUSP_OBF_NET_Reactor_Indicators_Jan24
Create hunting rule
Link:
https://www.unpac.me/results/0333cd28-aa9e-4ebe-94a5-8823afec752b/
SH256 hash:
666d91620d589b16b55f847c0c84396419461844d9ab844ad39a7df9d88c34e5
MD5 hash:
9fa71bd01a54e0726de72e272bcbe6eb
SHA1 hash:
03822545415f9dc69207495898c706c0d8340807
Link:
https://www.unpac.me/results/0333cd28-aa9e-4ebe-94a5-8823afec752b/
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/666d91620d58/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:NET
Create hunting rule
Author:malware-lu
Rule name:pe_imphash
Create hunting rule
Rule name:RansomPyShield_Antiransomware
Create hunting rule
Author:XiAnzheng
Description:Check for Suspicious String and Import combination that Ransomware mostly abuse(can create FP)
Rule name:Skystars_Malware_Imphash
Create hunting rule
Author:Skystars LightDefender
Description:imphash
Rule name:Sus_Obf_Enc_Spoof_Hide_PE
Create hunting rule
Author:XiAnzheng
Description:Check for Overlay, Obfuscating, Encrypting, Spoofing, Hiding, or Entropy Technique(can create FP)

File information

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

Web download

UmbralStealer

Executable exe 666d91620d589b16b55f847c0c84396419461844d9ab844ad39a7df9d88c34e5

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/3346495/
  
Delivery method
Distributed via web download
  
URLhaus
https://urlhaus.abuse.ch/url/3346496/
  
URLhaus
https://urlhaus.abuse.ch/url/3346507/
  
URLhaus
https://urlhaus.abuse.ch/url/3346468/

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 (GUARD_CF)high

Comments