MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b81f074c11d54ccc1947cbe1c42fbbb9cbc338c7bbd18d7ca2e6903755d3126f. 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


Formbook


Vendor detections: 16


Intelligence 16 IOCs YARA 5 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: b81f074c11d54ccc1947cbe1c42fbbb9cbc338c7bbd18d7ca2e6903755d3126f
SHA3-384 hash: bb70022de3bbf36ff7aab6c961bb1ae2be8df3be62881310a28d4a921d2b643fe00782b3f58fd4f911e35d22408d64cb
SHA1 hash: d442f295ce2a7f20d7613e399f3c651c9d7a1684
MD5 hash: 932a87d571d56d231e21e8b4f99ae7c8
humanhash: oscar-nitrogen-juliet-blue
File name:Gbbv8zRYvxcgBHP.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:706'560 bytes
First seen:2025-03-18 03:25:40 UTC
Last seen:2025-03-24 14:47:40 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'660 x AgentTesla, 19'469 x Formbook, 12'208 x SnakeKeylogger)
ssdeep 12288:q0hONPINJQ5LDt/k609Tn5inDx069Tj5tDo/ygnM56FcxJTRKAp7X1MAnk5vCEoO:PcNPHSTnalPv5tD2jnMQFqVhRnyCV
Threatray 2'797 similar samples on MalwareBazaar
TLSH T121E412B96A89ED67CC8507781873E3B25F746DACF429E753AADD9CEB7C4221460093C0
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
dhash icon 886443434b83cbe2 (17 x AgentTesla, 7 x Formbook, 4 x SnakeKeylogger)
Reporter threatcat_ch
Tags:exe FormBook

Intelligence

File Origin
# of uploads :
3
# of downloads :
532
Origin country :
CH CH
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
Gbbv8zRYvxcgBHP.exe
Verdict:
No threats detected
Analysis date:
2025-03-18 05:06:28 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/8cd444a3-125a-48c5-8876-bc757bfc8f8d

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Malicious
Score:
91.7%
Link:
https://cyber-fortress.com/docs/result/index.php?id=67d8fbdc3962f1a6f47285e0
Tags:
shell virus micro
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Сreating synchronization primitives
Creating a process with a hidden window
Unauthorized injection to a recently created process
Restart of the analyzed sample
Creating a file
Adding an exclusion to Microsoft Defender
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
obfuscated packed packed packer_detected
Link:
https://www.filescan.io/uploads/67d8e7d101edd28374b2e3da/reports/9433ed70-07fa-4f4e-a69a-fa976ab4dbfa/overview
Verdict:
Malicious
Labled as:
Win/malicious_confidence_100%
Link:
https://www.hybrid-analysis.com/sample/b81f074c11d54ccc1947cbe1c42fbbb9cbc338c7bbd18d7ca2e6903755d3126f
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/1f08f331-aafe-405b-a08d-f4181546c380
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1641236
Signature
.NET source code contains potential unpacker
Adds a directory exclusion to Windows Defender
Antivirus detection for URL or domain
Found direct / indirect Syscall (likely to bypass EDR)
Injects a PE file into a foreign processes
Joe Sandbox ML detected suspicious sample
Loading BitLocker PowerShell Module
Maps a DLL or memory area into another process
Modifies the context of a thread in another process (thread injection)
Multi AV Scanner detection for submitted file
Performs DNS queries to domains with low reputation
Queues an APC in another process (thread injection)
Sigma detected: Powershell Base64 Encoded MpPreference Cmdlet
Suricata IDS alerts for network traffic
Switches to a custom stack to bypass stack traces
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Mail credentials (via file / registry access)
Yara detected AntiVM3
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1641236 Sample: Gbbv8zRYvxcgBHP.exe Startdate: 18/03/2025 Architecture: WINDOWS Score: 100 46 www.nexusstakes.xyz 2->46 48 www.autografo.xyz 2->48 50 22 other IPs or domains 2->50 60 Suricata IDS alerts for network traffic 2->60 62 Antivirus detection for URL or domain 2->62 64 Multi AV Scanner detection for submitted file 2->64 68 5 other signatures 2->68 10 Gbbv8zRYvxcgBHP.exe 4 2->10         started        14 svchost.exe 1 1 2->14         started        signatures3 66 Performs DNS queries to domains with low reputation 48->66 process4 dnsIp5 38 C:\Users\user\...behaviorgraphbbv8zRYvxcgBHP.exe.log, ASCII 10->38 dropped 72 Adds a directory exclusion to Windows Defender 10->72 74 Injects a PE file into a foreign processes 10->74 17 Gbbv8zRYvxcgBHP.exe 10->17         started        20 powershell.exe 23 10->20         started        52 127.0.0.1 unknown unknown 14->52 file6 signatures7 process8 signatures9 54 Maps a DLL or memory area into another process 17->54 22 42GtzJ9Ua.exe 17->22 injected 56 Loading BitLocker PowerShell Module 20->56 25 WmiPrvSE.exe 20->25         started        27 conhost.exe 20->27         started        process10 signatures11 70 Found direct / indirect Syscall (likely to bypass EDR) 22->70 29 upnpcont.exe 13 22->29         started        process12 signatures13 76 Tries to steal Mail credentials (via file / registry access) 29->76 78 Tries to harvest and steal browser information (history, passwords, etc) 29->78 80 Modifies the context of a thread in another process (thread injection) 29->80 82 3 other signatures 29->82 32 42GtzJ9Ua.exe 29->32 injected 36 firefox.exe 29->36         started        process14 dnsIp15 40 dottorino.info 195.110.124.133, 49729, 49730, 49731 REGISTER-ASIT Italy 32->40 42 www.maxpeak.top 69.57.163.64, 49762, 49763, 49764 FORTRESSITXUS United States 32->42 44 8 other IPs or domains 32->44 58 Found direct / indirect Syscall (likely to bypass EDR) 32->58 signatures16
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/b81f074c11d54ccc1947cbe1c42fbbb9cbc338c7bbd18d7ca2e6903755d3126f
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/b81f074c11d54ccc1947cbe1c42fbbb9cbc338c7bbd18d7ca2e6903755d3126f/
Threat name:
ByteCode-MSIL.Trojan.Heracles
Create hunting rule
Status:
Malicious
First seen:
2025-03-18 03:26:11 UTC
File Type:
PE (.Net Exe)
Extracted files:
7
AV detection:
15 of 22 (68.18%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=xapqotar2vgmygkhzpq4il53xhf4goghxpiy27fc42idovotcjxq._file
Verdict:
malicious
Label(s):
unc_loader_037
Create hunting rule
Similar samples:
0430a90c31aec5b1dc8250061bad8a72854e2edee80c2999f1ac4dab32c22c55
Formbook
05933129150f0927685c83dbfb864f46255786b668e7a562c0c7e053e1f37dbe
Formbook
20570ccc8671e4d163bf80afe2a407a188f0bb6416acf095853e0e428fa9eab8
Formbook
37e335aff10117f36eebb8f1cb13312d071560592f3e556c49f431f288eecfa7
Formbook
41415c1dab37487faf427095855fb66cafa150ae15b9c515234e1e0b5f733aa8
Formbook
997b4dc3095f512657a0653b4efba798deb6fcf40f840ce2775a4f43c7d86791
Formbook
error
Formbook
f044b5d05d7ba6db1b4145a880af916645f2c3e1c28341cee79021ffedb4d1a9
Formbook
+ 2'787 additional samples on MalwareBazaar
Result
Malware family:
n/a
Score:
  8/10
Tags:
discovery execution
Link:
https://tria.ge/reports/250318-dy9a3atvcx/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
System Location Discovery: System Language Discovery
Suspicious use of SetThreadContext
Checks computer location settings
Command and Scripting Interpreter: PowerShell
Verdict:
Malicious
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/f836d083-a520-47a5-876c-233a55ddb8b3
Unpacked files
SH256 hash:
b81f074c11d54ccc1947cbe1c42fbbb9cbc338c7bbd18d7ca2e6903755d3126f
MD5 hash:
932a87d571d56d231e21e8b4f99ae7c8
SHA1 hash:
d442f295ce2a7f20d7613e399f3c651c9d7a1684
Link:
https://www.unpac.me/results/5d3230b9-5e46-49b7-be6e-2506256de6a3/
SH256 hash:
f842476d74838d1b27e538f3f864788a1cacb924e43f82b4a54308c7224ee146
MD5 hash:
be1c72385dc471ed6a7f8b60bfbd649e
SHA1 hash:
0e02a1e1033150e1592ad05e3e93bd95ccf76702
Detections:
INDICATOR_EXE_Packed_SmartAssembly
Create hunting rule
Link:
https://www.unpac.me/results/5d3230b9-5e46-49b7-be6e-2506256de6a3/
Parent samples :
b81f074c11d54ccc1947cbe1c42fbbb9cbc338c7bbd18d7ca2e6903755d3126f
3d0f6fd7bc98088001e550fed82caa73063fbbde486dbb933b40db23741674dd
c822084a8f1aa34346264bea15d6af68a8c1bd85a3eb2a80b5cd00085da29f24
4b4beec1e12d797f9b269b73d71d6561538ff45c502f4e67e9d9357b3786cbeb
e5ee0f86a7365463f8a0bdd3591624c214c8db88abf861d06d1fbd342a6fbfd1
SH256 hash:
0398027586b5a63765848a4f0d8e06b3647bc399654aa737af2bdce26948d1e9
MD5 hash:
ae175954e38248a771cd99731fe39758
SHA1 hash:
32ee9d67bc139e4366e4283183e6dd7d9ccf718c
Detections:
SUSP_OBF_NET_ConfuserEx_Name_Pattern_Jan24
Create hunting rule
SUSP_OBF_NET_Reactor_Indicators_Jan24
Create hunting rule
Link:
https://www.unpac.me/results/5d3230b9-5e46-49b7-be6e-2506256de6a3/
SH256 hash:
6f79e965aff54bb7c48ce4cabdb081f86bd979deaca7fddd26dd6e589365bcec
MD5 hash:
a5dba0e32d838a240bd0d2919c8db89a
SHA1 hash:
9df26fa8024552b56edb215e7f4afc1950b34c7a
Link:
https://www.unpac.me/results/5d3230b9-5e46-49b7-be6e-2506256de6a3/
SH256 hash:
9837ea469e9917b53d31570befa0f755733e03d288d438ddb8a8032ad44308fd
MD5 hash:
b0024fee681e92fdcb557a86b9fa72b0
SHA1 hash:
5810c79e4098eaf78c36a14a6e72c3b017e1f5a1
Link:
https://www.unpac.me/results/5d3230b9-5e46-49b7-be6e-2506256de6a3/
Malware family:
FormBook
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/b81f074c11d5/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/b81f074c11d54ccc1947cbe1c42fbbb9cbc338c7bbd18d7ca2e6903755d3126f

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:NETexecutableMicrosoft
Create hunting rule
Author:malware-lu
Rule name:pe_imphash
Create hunting rule
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.

Malspam

Formbook

Executable exe b81f074c11d54ccc1947cbe1c42fbbb9cbc338c7bbd18d7ca2e6903755d3126f

(this sample)

  
Delivery method
Distributed via e-mail attachment

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