MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 c6aa56afa7a6941d9bb8786b07e192ea996d3a133c992285b58349cc5c204561. 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 21 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: c6aa56afa7a6941d9bb8786b07e192ea996d3a133c992285b58349cc5c204561
SHA3-384 hash: aa8a656c11bb94bbd1e49ce24e72eb29b12b3cbfc2f8b3cb8665ed3c30a1672e4b61f794d5d270cf6f6d90e0d95f0f2b
SHA1 hash: 69eefed70a5c886524f63cbf329691377a366d3a
MD5 hash: 3237a99023bb062ef6ab993bcf6305ff
humanhash: butter-pennsylvania-three-venus
File name:MT LADY YASSO VSL BRIEF DETAILSpdf.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:963'072 bytes
First seen:2026-01-20 05:14:21 UTC
Last seen:2026-01-20 17:28:10 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'750 x AgentTesla, 19'656 x Formbook, 12'248 x SnakeKeylogger)
ssdeep 12288:qDa9y7hqp0ZIomwJiIC6TeXxd+e7pshgFOsZYwv96Jp7+Rh0DqvQ2KJFV3Y5xpnT:wITlXxUhgci9mp7+R2OQL25oc
Threatray 2'499 similar samples on MalwareBazaar
TLSH T16A2512187659E603C84947F40DB8E77113689E8EE500D393CFEE7DDB74A9B95AA08283
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 :
3
# of downloads :
124
Origin country :
CH CH
Vendor Threat Intelligence
Details
Link:
https://research.acce.ciphertechsolutions.com/results/d46e5ebb-409d-4042-b726-d4a0c030abfb/
Malware family:
n/a
ID:
1
File name:
MT LADY YASSO VSL BRIEF DETAILSpdf.exe
Verdict:
No threats detected
Analysis date:
2026-01-20 05:15:14 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/cfbf1044-e5c5-4fd4-a6b0-a0d7184785ba

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/49472/
Verdict:
Malicious
Score:
70%
Link:
https://cyber-fortress.com/docs/result/index.php?id=696f0f35bcad3327ec06ace4
Tags:
micro
Verdict:
Likely Malicious
Threat level:
  7.5/10
Confidence:
100%
Tags:
krypt packed
Link:
https://www.filescan.io/uploads/696f0f30f3c1b7b1fbd7eba5/reports/5ad5739f-ed5b-46d6-8086-fc0dece00d6c/overview
Verdict:
Malicious
Labled as:
Win/malicious_confidence_90%
Link:
https://www.hybrid-analysis.com/sample/c6aa56afa7a6941d9bb8786b07e192ea996d3a133c992285b58349cc5c204561
Verdict:
Malicious
File Type:
exe x32
First seen:
2026-01-20T02:01:00Z UTC
Last seen:
2026-01-22T02:47:00Z UTC
Hits:
~10000
Detections:
Trojan-Spy.Win32.Noon.sb Trojan-Spy.Noon.HTTP.ServerRequest PDM:Trojan.Win32.Generic HEUR:Trojan-Spy.MSIL.Noon.gen Backdoor.Agent.HTTP.C&C VHO:Trojan.Win32.Sdum.gen
Link:
https://opentip.kaspersky.com/c6aa56afa7a6941d9bb8786b07e192ea996d3a133c992285b58349cc5c204561/results?tab=lookup
Malware family:
Formbook
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/54e2d51f-66a3-4219-852e-f46673be3772
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1853750
Signature
.NET source code contains potential unpacker
Injects a PE file into a foreign processes
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 submitted file
Queues an APC in another process (thread injection)
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)
Unusual module load detection (module proxying)
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1853750 Sample: MT LADY YASSO VSL BRIEF DET... Startdate: 20/01/2026 Architecture: WINDOWS Score: 100 34 s3.ueyzqqnhdwf.top 2->34 36 goranstaxi.se 2->36 38 7 other IPs or domains 2->38 46 Suricata IDS alerts for network traffic 2->46 48 Multi AV Scanner detection for submitted file 2->48 50 Yara detected FormBook 2->50 52 3 other signatures 2->52 11 MT LADY YASSO VSL BRIEF DETAILSpdf.exe 3 2->11         started        signatures3 process4 file5 32 MT LADY YASSO VSL ... DETAILSpdf.exe.log, ASCII 11->32 dropped 62 Injects a PE file into a foreign processes 11->62 15 MT LADY YASSO VSL BRIEF DETAILSpdf.exe 11->15         started        signatures6 process7 signatures8 64 Maps a DLL or memory area into another process 15->64 18 qzcwEeVc.exe 15->18 injected process9 process10 20 unlodctr.exe 13 18->20         started        signatures11 54 Tries to steal Mail credentials (via file / registry access) 20->54 56 Tries to harvest and steal browser information (history, passwords, etc) 20->56 58 Modifies the context of a thread in another process (thread injection) 20->58 60 4 other signatures 20->60 23 afzPlBrhQGo.exe 20->23 injected 26 chrome.exe 20->26         started        28 firefox.exe 20->28         started        process12 dnsIp13 40 s3.ueyzqqnhdwf.top 43.226.78.180, 49736, 49737, 49738 CHINANET-LIAONING-DALIAN-MANCHINANETLiaoningprovinceDali China 23->40 42 goranstaxi.se 172.232.141.237, 49728, 49729, 49730 AKAMAI-ASN1EU United States 23->42 44 3 other IPs or domains 23->44 30 WerFault.exe 4 26->30         started        process14
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/c6aa56afa7a6941d9bb8786b07e192ea996d3a133c992285b58349cc5c204561
Verdict:
inconclusive
YARA:
5 match(es)
Tags:
.Net Executable Managed .NET PDB Path PE (Portable Executable) PE File Layout SOS: 0.21 Win 32 Exe x86
Link:
https://app.malva.re/file/3237a99023bb062ef6ab993bcf6305ff
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/c6aa56afa7a6941d9bb8786b07e192ea996d3a133c992285b58349cc5c204561/
Verdict:
Malicious
Threat:
Family.FORMBOOK
Link:
https://tip.neiki.dev/file/c6aa56afa7a6941d9bb8786b07e192ea996d3a133c992285b58349cc5c204561
Threat name:
ByteCode-MSIL.Backdoor.FormBook
Create hunting rule
Status:
Malicious
First seen:
2026-01-20 04:59:11 UTC
File Type:
PE (.Net Exe)
Extracted files:
7
AV detection:
17 of 24 (70.83%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=y2vfnl5hu2kb3g5ypbvqpyms5kmw2oqthsmsfbnvqne4yxbaivqq._file
Verdict:
malicious
Label(s):
formbook
Create hunting rule
Similar samples:
4eef5964d4be888f65a3410d0f60fd3559021aff06bf1448c919e294b7ecb72e
Formbook
571728e210ae139dc4fa0f18c737d161db62b197e8c5e28e28543b2bc074a549
Formbook
77be2ee5c55a9c5f20b6522fb6fbd174465481ad60b5143c95ee31e16fccaf8e
Formbook
9334cab7d15dcdd5909b7002d21108d6c1c9d0da4436db37b48763e3e7b1e5e9
Formbook
990f4fd84ce32890f866a99e5bea2a2d7f0aa64c40aacc28a4c359bff3dff636
Formbook
99e787914a65e928c023070c9a029cf58d4e405e4952bbb1142b1c8e53edfcc6
Formbook
b824470ef9a3b58d253689fb4736e3c9f39aaacf1bee32cbf113f94117bd1d48
Formbook
c6aa56afa7a6941d9bb8786b07e192ea996d3a133c992285b58349cc5c204561
Formbook
dc868203fe63fc8e75865fcfe43849fc1a4fd6a845416dee9497834b158669eb
Formbook
e4ff62b66b02a6f78870344b002d83ae80391d1cc0b1651085f23f28d41f027b
Formbook
error
Formbook
+ 2'489 additional samples on MalwareBazaar
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook discovery rat spyware stealer trojan
Link:
https://tria.ge/reports/260120-fw7esshy5c/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious use of WriteProcessMemory
System Location Discovery: System Language Discovery
SmartAssembly .NET packer
Suspicious use of SetThreadContext
Formbook payload
Formbook
Formbook family
Verdict:
Suspicious
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/ebccd004-6d87-4c2d-a006-644d16390b42
Unpacked files
SH256 hash:
c6aa56afa7a6941d9bb8786b07e192ea996d3a133c992285b58349cc5c204561
MD5 hash:
3237a99023bb062ef6ab993bcf6305ff
SHA1 hash:
69eefed70a5c886524f63cbf329691377a366d3a
Link:
https://www.unpac.me/results/5e3e8714-b7e5-4968-a71e-fbe5c46e5627/
SH256 hash:
2094497b3f255e8a87c2b757c2d70211bf9d57409352ccb7bfd396d41d332a93
MD5 hash:
cf4b62421ea5b6cc3c2e98c43cab27b3
SHA1 hash:
a35e74869129abb17e42a8670d71d6f75e6258dc
Link:
https://www.unpac.me/results/5e3e8714-b7e5-4968-a71e-fbe5c46e5627/
SH256 hash:
d4c5416bc2a5af3b1774ff39cb97559b60e9637b65e202e9d35cf1693f3ce471
MD5 hash:
6767996995d8a605a650adfb85503744
SHA1 hash:
b94096e4454ad8f0279c329b5a00a4578363d8d8
Detections:
INDICATOR_EXE_Packed_SmartAssembly
Create hunting rule
Link:
https://www.unpac.me/results/5e3e8714-b7e5-4968-a71e-fbe5c46e5627/
Parent samples :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 hash:
8e6bce458ba30e4187b1aeee0a428359920d2f587120c212ec80f1ccd9788b45
MD5 hash:
b164ecea82abb070c8f119dc43ebd3b9
SHA1 hash:
db95a2e52a7407e31848f3b3eecc85020a3be35f
Detections:
SUSP_OBF_NET_ConfuserEx_Name_Pattern_Jan24
Create hunting rule
Link:
https://www.unpac.me/results/5e3e8714-b7e5-4968-a71e-fbe5c46e5627/
SH256 hash:
83f731ca2b2297eea1592ba73700a69a704cbd69dac3d065c855669027a8adf0
MD5 hash:
85bbbbf468e67b56ff0df8a1b10e2408
SHA1 hash:
1554cc9831feb600d3a84ef4312941ad8d683dfa
Link:
https://www.unpac.me/results/5e3e8714-b7e5-4968-a71e-fbe5c46e5627/
Malware family:
FormBook
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/c6aa56afa7a6/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/c6aa56afa7a6941d9bb8786b07e192ea996d3a133c992285b58349cc5c204561

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_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__GlobalFlags
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:DebuggerCheck__QueryInfo
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:DebuggerHiding__Active
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:DebuggerHiding__Thread
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:DetectEncryptedVariants
Create hunting rule
Author:Zinyth
Description:Detects 'encrypted' in ASCII, Unicode, base64, or hex-encoded
Rule name:dgaagas
Create hunting rule
Author:Harshit
Description:Uses certutil.exe to download a file named test.txt
Rule name:Formbook
Create hunting rule
Author:kevoreilly
Description:Formbook Payload
Rule name:golang_bin_JCorn_CSC846
Create hunting rule
Author:Justin Cornwell
Description:CSC-846 Golang detection ruleset
Rule name:MD5_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for MD5 constants
Rule name:meth_stackstrings
Create hunting rule
Author:Willi Ballenthin
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:pe_no_import_table
Create hunting rule
Description:Detect pe file that no import table
Rule name:RIPEMD160_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for RIPEMD-160 constants
Rule name:SEH__vectored
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:SHA1_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for SHA1 constants
Rule name:shellcode
Create hunting rule
Author:nex
Description:Matched shellcode byte patterns
Rule name:Skystars_Malware_Imphash
Create hunting rule
Author:Skystars LightDefender
Description:imphash
Rule name:TH_Win_ETW_Bypass_2025_CYFARE
Create hunting rule
Author:CYFARE
Description:Windows ETW Bypass Detection 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 c6aa56afa7a6941d9bb8786b07e192ea996d3a133c992285b58349cc5c204561

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/49472/

Comments