MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 91c657cef25403ba946ecfe02fa69010169e8ab2515d3a1608b405ac3d12c1cd. 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: 17


Intelligence 17 IOCs YARA 18 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 91c657cef25403ba946ecfe02fa69010169e8ab2515d3a1608b405ac3d12c1cd
SHA3-384 hash: 1fa5dee643467b925a9a9ac77de8ed97ae73b21a33a9458ee8168030be58047878399f0f85ed9613808026467ec82634
SHA1 hash: e05e478ce595c575d20f26b9cecc027068af5cd4
MD5 hash: b6422c6c56cdab2a43415fdcceeaf3e6
humanhash: speaker-tennis-mockingbird-early
File name:Purchase Order_20240528.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:729'608 bytes
First seen:2024-05-28 05:13:07 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'666 x AgentTesla, 19'479 x Formbook, 12'209 x SnakeKeylogger)
ssdeep 12288:1KcJV/xL+hxh/ZmLtf1NamPJ79GaBMu02wuRgxpAg7jcXWFEaM3By1GkR:oYtN5nGGMNSGAg7tXn
TLSH T15CF4129A76347793C2B58AF051F6C1224BF0274B2BB0D7D92DD524DB0AE2F984386D1B
TrID 71.1% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13)
10.2% (.EXE) Win64 Executable (generic) (10523/12/4)
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)
File icon (PE):PE icon
dhash icon b2b269f0d4e88692 (5 x AgentTesla, 4 x Formbook, 2 x Loki)
Reporter threatcat_ch
Tags:exe FormBook

Intelligence

File Origin
# of uploads :
1
# of downloads :
378
Origin country :
CH CH
Vendor Threat Intelligence
Malware family:
formbook
Create hunting rule
ID:
1
File name:
91c657cef25403ba946ecfe02fa69010169e8ab2515d3a1608b405ac3d12c1cd.exe
Verdict:
Malicious activity
Analysis date:
2024-05-28 05:14:06 UTC
Tags:
formbook xloader
Link:
https://app.any.run/tasks/c841301e-95cf-4cec-aece-89e9937127c9

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection(s):
SecuriteInfo.com.Win32.CrypterX-gen.16651.13127.UNOFFICIAL
Create hunting rule

Verdict:
Malicious
Score:
95.7%
Link:
https://cyber-fortress.com/docs/result/index.php?id=665568275721c8e527177fb7win7simulatehigh_evasion
Tags:
Encryption Generic Static Swotter
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Unauthorized injection to a recently created process
Restart of the analyzed sample
Creating a file
Сreating synchronization primitives
Launching a process
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
masquerade overlay packed
Link:
https://www.filescan.io/uploads/6655681b458fabe8a95c34c0/reports/961e0e09-a93f-48c1-924d-d59c9ed98b83/overview
Verdict:
Malicious
Labled as:
Malware
Link:
https://www.hybrid-analysis.com/sample/91c657cef25403ba946ecfe02fa69010169e8ab2515d3a1608b405ac3d12c1cd
Result
Verdict:
MALICIOUS
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:
Malicious Packer
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/26a8aac2-a818-4950-a915-448c560c1027
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1448264
Signature
.NET source code contains potential unpacker
.NET source code contains very large array initializations
AI detected suspicious sample
Antivirus detection for URL or domain
Found direct / indirect Syscall (likely to bypass EDR)
Initial sample is a PE file and has a suspicious name
Injects a PE file into a foreign processes
Machine Learning detection for sample
Malicious sample detected (through community Yara rule)
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 domain / URL
Multi AV Scanner detection for submitted file
Queues an APC in another process (thread injection)
Snort IDS alert for network traffic
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Mail credentials (via file / registry access)
Uses nslookup.exe to query domains
Yara detected AntiVM3
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1448264 Sample: Purchase Order_20240528.exe Startdate: 28/05/2024 Architecture: WINDOWS Score: 100 28 www.vpachurch.org.uk 2->28 30 www.shortput.top 2->30 32 20 other IPs or domains 2->32 44 Snort IDS alert for network traffic 2->44 46 Multi AV Scanner detection for domain / URL 2->46 48 Malicious sample detected (through community Yara rule) 2->48 50 10 other signatures 2->50 10 Purchase Order_20240528.exe 3 2->10         started        signatures3 process4 signatures5 62 Injects a PE file into a foreign processes 10->62 13 Purchase Order_20240528.exe 10->13         started        process6 signatures7 64 Maps a DLL or memory area into another process 13->64 16 qFrNDyfVqdmmFLBeyXwBmuB.exe 13->16 injected process8 signatures9 40 Uses nslookup.exe to query domains 16->40 42 Found direct / indirect Syscall (likely to bypass EDR) 16->42 19 nslookup.exe 13 16->19         started        process10 signatures11 52 Tries to steal Mail credentials (via file / registry access) 19->52 54 Tries to harvest and steal browser information (history, passwords, etc) 19->54 56 Modifies the context of a thread in another process (thread injection) 19->56 58 2 other signatures 19->58 22 qFrNDyfVqdmmFLBeyXwBmuB.exe 19->22 injected 26 firefox.exe 19->26         started        process12 dnsIp13 34 www.shortput.top 203.161.43.227, 49741, 49742, 49743 VNPT-AS-VNVNPTCorpVN Malaysia 22->34 36 betopfloor.com 108.179.192.228, 49753, 49754, 49755 UNIFIEDLAYER-AS-1US United States 22->36 38 11 other IPs or domains 22->38 60 Found direct / indirect Syscall (likely to bypass EDR) 22->60 signatures14
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/91c657cef25403ba946ecfe02fa69010169e8ab2515d3a1608b405ac3d12c1cd
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/91c657cef25403ba946ecfe02fa69010169e8ab2515d3a1608b405ac3d12c1cd/
Threat name:
Win32.Trojan.FormBook
Create hunting rule
Status:
Malicious
First seen:
2024-05-28 03:13:36 UTC
File Type:
PE (.Net Exe)
Extracted files:
11
AV detection:
21 of 24 (87.50%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=shdfptxskqb3vfdoz7qc7juqcalj5cvskfotufqiwqc2ypisyhgq._file
Verdict:
malicious
Label(s):
formbook
Create hunting rule
Result
Malware family:
n/a
Score:
  5/10
Tags:
n/a
Link:
https://tria.ge/reports/240528-fwzpysgg77/
Behaviour
Modifies Internet Explorer settings
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of UnmapMainImage
Suspicious use of WriteProcessMemory
Suspicious use of SetThreadContext
Verdict:
Suspicious
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/400abe8a-7784-41fc-902e-dc6d9b26c957
Unpacked files
SH256 hash:
ea9eef71655ad92fb314ddf37633b88f23eebeffde6d547fe51c3fa662a9e9bc
MD5 hash:
f81207e10a74338541e8723a6a417124
SHA1 hash:
4e1e5af4c43fac8d1c52e3d8ad7879cdbc2492c1
Link:
https://www.unpac.me/results/e67623ba-6bb0-4e8b-81e2-a0bb955dc9d4/
SH256 hash:
ebf469c46d04df3e52eb8690219f91dfcc6d0f29ec0c382155041f6da8537c39
MD5 hash:
8290a941e1129be99cf08f0e5ce5e1c1
SHA1 hash:
33161ef23a5ed447dc35a8b61b37705525dfdb9d
Link:
https://www.unpac.me/results/e67623ba-6bb0-4e8b-81e2-a0bb955dc9d4/
SH256 hash:
73113abdadefd54e02f0d3f3aec21c31e96b315dc2ad6ae7d725cd5197e97c48
MD5 hash:
ae27d0d76e10c13d9dc0ad2a6b147756
SHA1 hash:
f1a4bc030b4476ac1450cc797213e34f567dd434
Link:
https://www.unpac.me/results/e67623ba-6bb0-4e8b-81e2-a0bb955dc9d4/
SH256 hash:
1a1de9f3fe4c3a7ea7cd547cdd9d78b3873d6e243e544e5bb647452d6d9f6cfe
MD5 hash:
ceb52a5c98659e8905ea76737fe00c01
SHA1 hash:
bb7b30ff84d6aa26eaa0021c9fa3cd2c5a08e694
Link:
https://www.unpac.me/results/e67623ba-6bb0-4e8b-81e2-a0bb955dc9d4/
SH256 hash:
429fdbfeb6d6e32f8006a6285bcee8235b49de66f8fb011a4327677e36609948
MD5 hash:
7e6735f1d3b617a3b6fe3173c16129c7
SHA1 hash:
b2f267ce49cb1fb36b24c2670cc8eb384f59d318
Link:
https://www.unpac.me/results/e67623ba-6bb0-4e8b-81e2-a0bb955dc9d4/
SH256 hash:
f44e2326d631a8b1c6f12108d065c40025074a4b99900ae347b78d49533d4bf6
MD5 hash:
cb28453bcc6bc73c47cd1248e72c8aa9
SHA1 hash:
3db02510b120c8b1e88c6a2e9d1eb4c2de9be34e
Link:
https://www.unpac.me/results/e67623ba-6bb0-4e8b-81e2-a0bb955dc9d4/
SH256 hash:
91c657cef25403ba946ecfe02fa69010169e8ab2515d3a1608b405ac3d12c1cd
MD5 hash:
b6422c6c56cdab2a43415fdcceeaf3e6
SHA1 hash:
e05e478ce595c575d20f26b9cecc027068af5cd4
Detections:
INDICATOR_KB_CERT_7c1118cbbadc95da3752c46e47a27438
Create hunting rule
Link:
https://www.unpac.me/results/e67623ba-6bb0-4e8b-81e2-a0bb955dc9d4/
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/91c657cef254/report/overview.html
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Formbook
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/91c657cef25403ba946ecfe02fa69010169e8ab2515d3a1608b405ac3d12c1cd

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:Formbook
Create hunting rule
Author:kevoreilly
Description:Formbook Payload
Rule name:INDICATOR_KB_CERT_7c1118cbbadc95da3752c46e47a27438
Create hunting rule
Author:ditekSHen
Description:Detects executables signed with stolen, revoked or invalid certificates
Rule name:maldoc_getEIP_method_1
Create hunting rule
Author:Didier Stevens (https://DidierStevens.com)
Rule name:meth_get_eip
Create hunting rule
Author:Willi Ballenthin
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_Digital_Certificate
Create hunting rule
Author:albertzsigovits
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:PE_Potentially_Signed_Digital_Certificate
Create hunting rule
Author:albertzsigovits
Rule name:RIPEMD160_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for RIPEMD-160 constants
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:Windows_Trojan_Formbook
Create hunting rule
Author:@malgamy12
Rule name:Windows_Trojan_Formbook_1112e116
Create hunting rule
Author:Elastic Security
Reference:https://www.elastic.co/security-labs/formbook-adopts-cab-less-approach
Rule name:win_formbook_w0
Create hunting rule
Author:@malgamy12

File information

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

Malspam

Formbook

Executable exe 91c657cef25403ba946ecfe02fa69010169e8ab2515d3a1608b405ac3d12c1cd

(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 (HIGH_ENTROPY_VA)high

Comments