MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b92ba639eab5cffac0ba3cd2e1ea98448be3063b2dd43a6e102e284734f9cb4f. 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: 18


Intelligence 18 IOCs YARA 6 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: b92ba639eab5cffac0ba3cd2e1ea98448be3063b2dd43a6e102e284734f9cb4f
SHA3-384 hash: 3072017343104a8c42877016990adf5cb674e2f73388ae06640ac782b7b257501ff1d299cfd715f136804c1b42134870
SHA1 hash: c785dd0147b41454ae91e0d887fdd5167c3cad64
MD5 hash: a822f66ceeff72f1cb8a3c5a2dd350e7
humanhash: island-fifteen-wisconsin-blue
File name:interna_lletter pdf.bat
Download: download sample
Signature Formbook
Create hunting rule
File size:888'832 bytes
First seen:2025-09-11 21:36:49 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'744 x AgentTesla, 19'608 x Formbook, 12'242 x SnakeKeylogger)
ssdeep 12288:0fMG4BQaKqOZQ8M5jW4aHy54G5GAO57EQB7VfL1vBkbtpw9wjdGtYXwgltxn/+u7:IoqRRQ3jPaHy9GAojrBkh9dG0wgltF/
TLSH T15415CFAC3254B59EC553CE728E74DC70AA606DAA9707C20395D71DAFB81DA97CF002E3
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 threatcat_ch
Tags:exe FormBook

Intelligence

File Origin
# of uploads :
1
# of downloads :
124
Origin country :
CH CH
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
interna_lletter pdf.bat
Verdict:
No threats detected
Analysis date:
2025-09-11 21:37:52 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/20f9c7e0-7aaf-4a84-8f7e-42870734d3cf

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
Formbook
Create hunting rule
Link:
https://www.capesandbox.com/analysis/27002/
Verdict:
Malicious
Score:
90.9%
Link:
https://cyber-fortress.com/docs/result/index.php?id=68c341186e66ba602d7aa50c
Tags:
agenttesla shell virus msil
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Creating a process with a hidden window
Unauthorized injection to a recently created process
Restart of the analyzed sample
Creating a file
Сreating synchronization primitives
Adding an exclusion to Microsoft Defender
Verdict:
Likely Malicious
Threat level:
  7.5/10
Confidence:
100%
Tags:
masquerade obfuscated obfuscated packed
Link:
https://www.filescan.io/uploads/68c34119dbc6f5a29c40c59e/reports/23cf2298-03ed-49a0-aebd-a130c9034aa4/overview
Verdict:
Malicious
Labled as:
Win/malicious_confidence_100%
Link:
https://www.hybrid-analysis.com/sample/b92ba639eab5cffac0ba3cd2e1ea98448be3063b2dd43a6e102e284734f9cb4f
Verdict:
Malicious
File Type:
exe x32
First seen:
2025-09-11T14:38:00Z UTC
Last seen:
2025-09-11T14:38:00Z UTC
Hits:
~100
Link:
https://opentip.kaspersky.com/b92ba639eab5cffac0ba3cd2e1ea98448be3063b2dd43a6e102e284734f9cb4f/results?tab=lookup
Malware family:
Agent Tesla
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/373032e7-a35e-437d-ba44-2332604b2f62
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1776004
Signature
.NET source code contains method to dynamically call methods (often used by packers)
.NET source code contains potential unpacker
Adds a directory exclusion to Windows Defender
Antivirus / Scanner detection for submitted sample
Antivirus detection for URL or domain
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
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: 1776004 Sample: interna_lletter pdf.bat.exe Startdate: 11/09/2025 Architecture: WINDOWS Score: 100 36 www.ecpay-tw067.xyz 2->36 38 www.78452609.xyz 2->38 40 21 other IPs or domains 2->40 48 Suricata IDS alerts for network traffic 2->48 50 Antivirus detection for URL or domain 2->50 52 Antivirus / Scanner detection for submitted sample 2->52 56 8 other signatures 2->56 11 interna_lletter pdf.bat.exe 4 2->11         started        signatures3 54 Performs DNS queries to domains with low reputation 38->54 process4 file5 34 C:\Users\...\interna_lletter pdf.bat.exe.log, ASCII 11->34 dropped 66 Adds a directory exclusion to Windows Defender 11->66 15 interna_lletter pdf.bat.exe 11->15         started        18 powershell.exe 23 11->18         started        signatures6 process7 signatures8 68 Maps a DLL or memory area into another process 15->68 20 1BWGy8vclKU.exe 15->20 injected 70 Loading BitLocker PowerShell Module 18->70 23 conhost.exe 18->23         started        process9 dnsIp10 42 www.suvorr.tokyo 46.37.111.21, 49702, 49703, 49704 Y-INTERNETGB Spain 20->42 44 www.nexilo.life 162.0.239.7, 49706, 49707, 49708 NAMECHEAP-NETUS Canada 20->44 46 10 other IPs or domains 20->46 25 clip.exe 13 20->25         started        process11 signatures12 58 Tries to steal Mail credentials (via file / registry access) 25->58 60 Tries to harvest and steal browser information (history, passwords, etc) 25->60 62 Modifies the context of a thread in another process (thread injection) 25->62 64 2 other signatures 25->64 28 chrome.exe 25->28         started        30 firefox.exe 25->30         started        process13 process14 32 WerFault.exe 4 28->32         started       
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/b92ba639eab5cffac0ba3cd2e1ea98448be3063b2dd43a6e102e284734f9cb4f
Verdict:
inconclusive
YARA:
12 match(es)
Tags:
.Net Executable Managed .NET PE (Portable Executable) PE File Layout SOS: 0.78 Win 32 Exe x86
Link:
https://app.malva.re/file/a822f66ceeff72f1cb8a3c5a2dd350e7
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/b92ba639eab5cffac0ba3cd2e1ea98448be3063b2dd43a6e102e284734f9cb4f/
Threat name:
Win32.Trojan.Egairtigado
Create hunting rule
Status:
Malicious
First seen:
2025-09-11 19:52:40 UTC
File Type:
PE (.Net Exe)
Extracted files:
9
AV detection:
23 of 38 (60.53%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=xev2mopkwxh7vqf2htjod2uyisf6gbr3fxkdu3qqfyueonhzznhq._file
Verdict:
malicious
Label(s):
unc_loader_037
Create hunting rule
Similar samples:
error
Formbook
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook discovery execution rat spyware stealer trojan
Link:
https://tria.ge/reports/250911-1gplnaxwgw/
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
Formbook payload
Formbook
Formbook family
Verdict:
Malicious
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/9c5ceb6e-0bd4-4a0c-bec8-89232a5ada45
Unpacked files
SH256 hash:
b92ba639eab5cffac0ba3cd2e1ea98448be3063b2dd43a6e102e284734f9cb4f
MD5 hash:
a822f66ceeff72f1cb8a3c5a2dd350e7
SHA1 hash:
c785dd0147b41454ae91e0d887fdd5167c3cad64
Link:
https://www.unpac.me/results/cb13cfb4-ebb6-4ad0-b404-a15e29acbf0e/
SH256 hash:
2ec2e9ac00b5c64cee72cf8071bbeb801e899c24c6c92b0ba52bcd4baab2b765
MD5 hash:
ddcc13ecfe4ca31cc4cfe97ba628ccc4
SHA1 hash:
2da647384844cc0de8f527806dcb8aa492903324
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/cb13cfb4-ebb6-4ad0-b404-a15e29acbf0e/
SH256 hash:
12dda0cd3b378fbced3071df357733426bb09e47c31fcc3ba6273650f67895dc
MD5 hash:
773c55854eb467033abb78bc2b667f80
SHA1 hash:
54bfd694185cd257abb4ee6b477dba12b971b9b9
Link:
https://www.unpac.me/results/cb13cfb4-ebb6-4ad0-b404-a15e29acbf0e/
SH256 hash:
1c30cc7458ec56557ec3b6a6f5b6f85ddfb93e2e33785d332b86aa95fda5f521
MD5 hash:
5e16e45a0c609879f79a10fd545dfd8b
SHA1 hash:
ee83cabfaf5af082d6c4f4113ef7573e18c6f017
Link:
https://www.unpac.me/results/cb13cfb4-ebb6-4ad0-b404-a15e29acbf0e/
SH256 hash:
a6df6c6e4b4f537e820729250c5700e39147cbcb6b237faf1a51dadfbba3578d
MD5 hash:
39e18a84c0a5781f4b4664e029d275b7
SHA1 hash:
7feeea3739308e7e67ae43037ce288d7aa1f3c45
Link:
https://www.unpac.me/results/cb13cfb4-ebb6-4ad0-b404-a15e29acbf0e/
Malware family:
FormBook
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/b92ba639eab5/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/b92ba639eab5cffac0ba3cd2e1ea98448be3063b2dd43a6e102e284734f9cb4f

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:CP_AllMal_Detector
Create hunting rule
Author:DiegoAnalytics
Description:CrossPlatform All Malwares Detector: Detect PE, ELF, Mach-O, scripts, archives; overlay, obfuscation, encryption, spoofing, hiding, high entropy, network communication
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 b92ba639eab5cffac0ba3cd2e1ea98448be3063b2dd43a6e102e284734f9cb4f

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/27002/

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