MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b3942d6dfb0b11aa8c229e55b2cf42da88f9a993c85bc7d3adb328c2ee2f1476. 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: 19


Intelligence 19 IOCs YARA 8 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: b3942d6dfb0b11aa8c229e55b2cf42da88f9a993c85bc7d3adb328c2ee2f1476
SHA3-384 hash: a6e29bed9960fe4c60c4aa42468eece3b975647eb9dec3218d50e61c379e39f330996d29cc97a59f6636ab6ed18f4e19
SHA1 hash: 99cd89e47a491aa4a9db72415efbb8032416ac8b
MD5 hash: e74da7d7c60ad3dda63b6493242fa3e9
humanhash: connecticut-magnesium-social-grey
File name:7755591297776.img.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:1'221'120 bytes
First seen:2025-11-25 14:55:54 UTC
Last seen:2025-12-08 15:43:57 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash 1895460fffad9475fda0c84755ecfee1 (341 x Formbook, 90 x AgentTesla, 56 x a310Logger)
ssdeep 24576:x5EmXFtKaL4/oFe5T9yyXYfP1ijXda3du713PzwuPYTE:xPVt/LZeJbInQRa3M5Zw
TLSH T17F45BF0273D1C062FFAB92334B56F6115ABC79260123EA1F13981DB9BE705B1563E7A3
TrID 40.3% (.EXE) Win64 Executable (generic) (10522/11/4)
19.3% (.EXE) Win16 NE executable (generic) (5038/12/1)
17.2% (.EXE) Win32 Executable (generic) (4504/4/1)
7.7% (.EXE) OS/2 Executable (generic) (2029/13)
7.6% (.EXE) Generic Win/DOS Executable (2002/3)
Magika pebin
Reporter threatcat_ch
Tags:exe FormBook

Intelligence

File Origin
# of uploads :
2
# of downloads :
133
Origin country :
CH CH
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
7755591297776.img.exe
Verdict:
Malicious activity
Analysis date:
2025-11-25 14:56:37 UTC
Tags:
auto-startup
Link:
https://app.any.run/tasks/5f27db19-1fd5-448b-9865-afc2c5603c50

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/41465/
Detection(s):
SecuriteInfo.com.Win32.Trojan.Agent.35E5V6.UNOFFICIAL
Create hunting rule

Verdict:
Malicious
Score:
99.9%
Link:
https://cyber-fortress.com/docs/result/index.php?id=6925c396587b4206e7f2ca40
Tags:
autorun autoit emotet
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Creating a file in the %temp% directory
Creating a file
Creating a process from a recently created file
Launching a process
Searching for synchronization primitives
Launching the default Windows debugger (dwwin.exe)
DNS request
Enabling autorun by creating a file
Unauthorized injection to a system process
Verdict:
Likely Malicious
Threat level:
  7.5/10
Confidence:
100%
Tags:
adaptive-context anti-debug autoit compiled-script fingerprint keylogger masquerade microsoft_visual_cc packed
Link:
https://www.filescan.io/uploads/6925c3941d4c8d00732ece58/reports/c41e24d7-9e16-45b1-8274-febddd30da11/overview
Verdict:
Malicious
Labled as:
Win/malicious_confidence_100%
Link:
https://www.hybrid-analysis.com/sample/b3942d6dfb0b11aa8c229e55b2cf42da88f9a993c85bc7d3adb328c2ee2f1476
Verdict:
Malicious
File Type:
exe x32
First seen:
2025-11-25T10:23:00Z UTC
Last seen:
2025-11-27T10:28:00Z UTC
Hits:
~1000
Link:
https://opentip.kaspersky.com/b3942d6dfb0b11aa8c229e55b2cf42da88f9a993c85bc7d3adb328c2ee2f1476/results?tab=lookup
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/6311f579-dc75-4710-b885-5a00af46bb37
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1820620
Signature
Antivirus / Scanner detection for submitted sample
Antivirus detection for dropped file
Binary is likely a compiled AutoIt script file
Drops VBS files to the startup folder
Found API chain indicative of sandbox detection
Joe Sandbox ML detected suspicious sample
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 dropped file
Multi AV Scanner detection for submitted file
Performs DNS queries to domains with low reputation
Sigma detected: Drops script at startup location
Sigma detected: WScript or CScript Dropper
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)
Unusual module load detection (module proxying)
Windows Scripting host queries suspicious COM object (likely to drop second stage)
Writes to foreign memory regions
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1820620 Sample: 7755591297776.img.exe Startdate: 25/11/2025 Architecture: WINDOWS Score: 100 45 www.030059015.xyz 2->45 47 www.xplora-gaming.com 2->47 49 8 other IPs or domains 2->49 65 Antivirus / Scanner detection for submitted sample 2->65 67 Multi AV Scanner detection for submitted file 2->67 69 Yara detected FormBook 2->69 73 5 other signatures 2->73 12 7755591297776.img.exe 6 2->12         started        16 wscript.exe 1 2->16         started        signatures3 71 Performs DNS queries to domains with low reputation 45->71 process4 file5 43 C:\Users\user\AppData\Local\...\Mazateco.exe, PE32 12->43 dropped 91 Binary is likely a compiled AutoIt script file 12->91 93 Unusual module load detection (module proxying) 12->93 18 Mazateco.exe 3 12->18         started        95 Windows Scripting host queries suspicious COM object (likely to drop second stage) 16->95 22 Mazateco.exe 2 16->22         started        signatures6 process7 file8 41 C:\Users\user\AppData\...\Mazateco.vbs, data 18->41 dropped 75 Antivirus detection for dropped file 18->75 77 Multi AV Scanner detection for dropped file 18->77 79 Binary is likely a compiled AutoIt script file 18->79 85 3 other signatures 18->85 24 svchost.exe 18->24         started        81 Writes to foreign memory regions 22->81 83 Maps a DLL or memory area into another process 22->83 27 svchost.exe 22->27         started        signatures9 process10 signatures11 87 Maps a DLL or memory area into another process 24->87 89 Unusual module load detection (module proxying) 24->89 29 S4n9xgTNBKCVXn.exe 24->29 injected process12 dnsIp13 51 corpomedgua.website 50.31.177.154, 49692, 49693, 49694 SERVERCENTRALUS United States 29->51 53 e-commercetrading.com 198.251.89.220, 49702, 49703, 49704 PONYNETUS United States 29->53 55 3 other IPs or domains 29->55 32 typeperf.exe 13 29->32         started        process14 signatures15 57 Tries to steal Mail credentials (via file / registry access) 32->57 59 Tries to harvest and steal browser information (history, passwords, etc) 32->59 61 Modifies the context of a thread in another process (thread injection) 32->61 63 3 other signatures 32->63 35 chrome.exe 32->35         started        37 firefox.exe 32->37         started        process16 process17 39 WerFault.exe 4 35->39         started       
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/b3942d6dfb0b11aa8c229e55b2cf42da88f9a993c85bc7d3adb328c2ee2f1476
Verdict:
Malware
YARA:
7 match(es)
Tags:
AutoIt Decompiled Executable PDB Path PE (Portable Executable) PE File Layout Suspect Win 32 Exe x86
Link:
https://app.malva.re/file/e74da7d7c60ad3dda63b6493242fa3e9
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/b3942d6dfb0b11aa8c229e55b2cf42da88f9a993c85bc7d3adb328c2ee2f1476/
Verdict:
Malicious
Threat:
Family.FORMBOOK
Link:
https://tip.neiki.dev/file/b3942d6dfb0b11aa8c229e55b2cf42da88f9a993c85bc7d3adb328c2ee2f1476
Threat name:
Win32.Malware.Heuristic
Create hunting rule
Status:
Malicious
First seen:
2025-11-25 13:24:00 UTC
File Type:
PE (Exe)
Extracted files:
28
AV detection:
19 of 24 (79.17%)
Threat level:
  2/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=wokc23p3bmi2vdbctzk3ft2c3keptkmtzbn4pu5nwmumf3rpcr3a._file
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook discovery rat spyware stealer trojan
Link:
https://tria.ge/reports/251125-sa6mlaxnhr/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of FindShellTrayWindow
Suspicious use of SendNotifyMessage
Suspicious use of WriteProcessMemory
Program crash
System Location Discovery: System Language Discovery
AutoIT Executable
Suspicious use of SetThreadContext
Drops startup file
Executes dropped EXE
Formbook payload
Formbook
Formbook family
Verdict:
Malicious
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/cefd6e74-fc59-401a-94b2-55bdf8eb1797
Unpacked files
SH256 hash:
b3942d6dfb0b11aa8c229e55b2cf42da88f9a993c85bc7d3adb328c2ee2f1476
MD5 hash:
e74da7d7c60ad3dda63b6493242fa3e9
SHA1 hash:
99cd89e47a491aa4a9db72415efbb8032416ac8b
Link:
https://www.unpac.me/results/9c9624f2-ec96-4f6c-b5b1-ab7519fae6be/
SH256 hash:
7ac112d7ebdbf4909fe443d4fe83318783d2662b32aed740b9bfb015e51c9c4a
MD5 hash:
947849f49f0cbf58642c172c8de2b0c9
SHA1 hash:
d4eb0baecd79320e1bac6017157e903cacd22a73
Link:
https://www.unpac.me/results/9c9624f2-ec96-4f6c-b5b1-ab7519fae6be/
SH256 hash:
4199a13d5f6a5a4f9be82ec4b81404d44ec05a89f4155eb3c3366f06561dc941
MD5 hash:
4d52fc8c55eeeb67efe6e1d222d523a3
SHA1 hash:
46624dceaa72b98fe5622519904f0b154978fd45
Detections:
win_formbook_g0
Create hunting rule
Link:
https://www.unpac.me/results/9c9624f2-ec96-4f6c-b5b1-ab7519fae6be/
Parent samples :
e9d5396c421427a2f91a52de7109fc642837dcf9dad29f7500bd51310a400d5a
d282f4c83e313cd23a89b1d0ff819cea73990d5a52d449bddd9f91b398523590
b3942d6dfb0b11aa8c229e55b2cf42da88f9a993c85bc7d3adb328c2ee2f1476
5ca1cd75c510adff5ec4d592556594d86db181dc1e6bb3b8bc5cb98c70708921
Malware family:
FormBook
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/b3942d6dfb0b/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/b3942d6dfb0b11aa8c229e55b2cf42da88f9a993c85bc7d3adb328c2ee2f1476

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:AutoIT_Compiled
Create hunting rule
Author:@bartblaze
Description:Identifies compiled AutoIT script (as EXE). This rule by itself does NOT necessarily mean the detected file is malicious.
Rule name:CP_Script_Inject_Detector
Create hunting rule
Author:DiegoAnalytics
Description:Detects attempts to inject code into another process across PE, ELF, Mach-O binaries
Rule name:DebuggerCheck__API
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:golang_bin_JCorn_CSC846
Create hunting rule
Author:Justin Cornwell
Description:CSC-846 Golang detection ruleset
Rule name:pe_detect_tls_callbacks
Create hunting rule
Rule name:pe_no_import_table
Create hunting rule
Description:Detect pe file that no import table
Rule name:shellcode
Create hunting rule
Author:nex
Description:Matched shellcode byte patterns
Rule name:TH_Generic_MassHunt_Win_Malware_2025_CYFARE
Create hunting rule
Author:CYFARE
Description:Generic Windows malware mass-hunt rule - 2025
Reference:https://cyfare.net/

File information

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

Malspam

Formbook

Executable exe b3942d6dfb0b11aa8c229e55b2cf42da88f9a993c85bc7d3adb328c2ee2f1476

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/41465/

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