MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 66c5b65f8e75acbce3103b6527cc1c32fdb53467c9b22475f36b60b28ed85f26. 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: 15


Intelligence 15 IOCs YARA 5 File information Comments
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SHA256 hash: 66c5b65f8e75acbce3103b6527cc1c32fdb53467c9b22475f36b60b28ed85f26
SHA3-384 hash: c07d37a226741ec0c0631a50de6956c03398e628411480ffeb38d717e842c896e93dc561cdd691d97e4010367043bad2
SHA1 hash: c6b5793e7e2bbb9ec7800c3be8c93ce6133e7c08
MD5 hash: fbca6486149d6f11d5bd8bf08381a50c
humanhash: october-item-delaware-ink
File name:fbca6486149d6f11d5bd8bf08381a50c.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:546'229 bytes
First seen:2022-11-25 07:40:44 UTC
Last seen:2022-11-25 09:41:00 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash ab6770b0a8635b9d92a5838920cfe770 (84 x Formbook, 30 x AgentTesla, 15 x Loki)
ssdeep 6144:HBnFSsVAU8BQmtEML/cLo/EJ8ADBbszFZnEnGEPUsEy8a4vGbYXja8liAEgaOw:3AU8GML/ciz5ZEn7PUsEvaLbkliRgPw
TLSH T15DC4CFE33220B5B9C45546B6C143CEDA9774FAB287C1120631B8BF3F1A722C5E61ADD6
TrID 47.3% (.EXE) Win32 Executable MS Visual C++ (generic) (31206/45/13)
15.9% (.EXE) Win64 Executable (generic) (10523/12/4)
9.9% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
7.6% (.EXE) Win16 NE executable (generic) (5038/12/1)
6.8% (.EXE) Win32 Executable (generic) (4505/5/1)
File icon (PE):PE icon
dhash icon c0e0fcfcfcf0f808 (3 x Formbook, 1 x AveMariaRAT)
Reporter abuse_ch
Tags:exe FormBook

Intelligence

File Origin
# of uploads :
2
# of downloads :
376
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
formbook
Create hunting rule
ID:
1
File name:
invoice.doc
Verdict:
Malicious activity
Analysis date:
2022-11-24 03:18:39 UTC
Tags:
trojan exploit cve-2017-11882 loader formbook stealer
Link:
https://app.any.run/tasks/a2da45b7-857c-4f7a-8938-5e962af167a2

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/338365/
Detection(s):
SecuriteInfo.com.Trojan.Siggen19.12484.3681.7146.UNOFFICIAL
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Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a file in the %temp% directory
Creating a process from a recently created file
Searching for the window
Launching a process
Сreating synchronization primitives
Launching cmd.exe command interpreter
Searching for synchronization primitives
Setting browser functions hooks
Unauthorized injection to a recently created process
Unauthorized injection to a recently created process by context flags manipulation
Unauthorized injection to a system process
Unauthorized injection to a browser process
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
overlay packed shell32.dll
Link:
https://www.filescan.io/uploads/6380719000c584752ee1cdef/reports/eed46bb9-9800-46d9-aad6-5954afade1e9/overview
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:
LockBit Ransomware
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Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/05b7c858-b856-47bb-9add-5edce624fab7
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1120951
Signature
C2 URLs / IPs found in malware configuration
Found evasive API chain (may stop execution after reading information in the PEB, e.g. number of processors)
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)
Modifies the prolog of user mode functions (user mode inline hooks)
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
System process connects to network (likely due to code injection or exploit)
Tries to detect virtualization through RDTSC time measurements
Uses netsh to modify the Windows network and firewall settings
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 753668 Sample: T9aSvLqcAv.exe Startdate: 25/11/2022 Architecture: WINDOWS Score: 100 34 www.ekeisolutions.com 2->34 36 ekeisolutions.com 2->36 52 Malicious sample detected (through community Yara rule) 2->52 54 Multi AV Scanner detection for submitted file 2->54 56 Yara detected FormBook 2->56 58 3 other signatures 2->58 11 T9aSvLqcAv.exe 19 2->11         started        signatures3 process4 file5 32 C:\Users\user\AppData\Local\Temp\pozwro.exe, PE32 11->32 dropped 14 pozwro.exe 1 11->14         started        process6 signatures7 68 Multi AV Scanner detection for dropped file 14->68 70 Found evasive API chain (may stop execution after reading information in the PEB, e.g. number of processors) 14->70 72 Uses netsh to modify the Windows network and firewall settings 14->72 74 2 other signatures 14->74 17 pozwro.exe 14->17         started        20 conhost.exe 14->20         started        process8 signatures9 44 Modifies the context of a thread in another process (thread injection) 17->44 46 Maps a DLL or memory area into another process 17->46 48 Sample uses process hollowing technique 17->48 50 Queues an APC in another process (thread injection) 17->50 22 netsh.exe 17->22         started        25 explorer.exe 17->25 injected process10 dnsIp11 60 Modifies the context of a thread in another process (thread injection) 22->60 62 Maps a DLL or memory area into another process 22->62 64 Tries to detect virtualization through RDTSC time measurements 22->64 28 cmd.exe 1 22->28         started        38 www.bullybrain.com 25->38 40 hdr-nlb7-aebd5d615260636b.elb.us-east-1.amazonaws.com 34.205.242.146, 49699, 80 AMAZON-AESUS United States 25->40 42 traff-5.hugedomains.com 25->42 66 System process connects to network (likely due to code injection or exploit) 25->66 signatures12 process13 process14 30 conhost.exe 28->30         started       
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/66c5b65f8e75acbce3103b6527cc1c32fdb53467c9b22475f36b60b28ed85f26/
Threat name:
Win32.Trojan.FormBook
Create hunting rule
Status:
Malicious
First seen:
2022-11-24 06:59:41 UTC
File Type:
PE (Exe)
Extracted files:
4
AV detection:
26 of 40 (65.00%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=m3c3mx4oowwlzyyqhnsspta4gl63kndhzgzci5ptnnqlfdwyl4ta._file
Verdict:
malicious
Label(s):
formbook
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cobaltstrike
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Result
Malware family:
formbook
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Score:
  10/10
Tags:
family:formbook campaign:lt63 rat spyware stealer trojan
Link:
https://tria.ge/reports/221125-jh4zasfa7v/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
Suspicious use of SendNotifyMessage
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Suspicious use of SetThreadContext
Loads dropped DLL
Executes dropped EXE
Formbook payload
Formbook
Verdict:
Suspicious
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/80f1a922-7792-4e99-a747-f574661348d1
Unpacked files
SH256 hash:
f85988a97318ca71790688312a923e4b10cd05790801c747b0f0bb9ebc0a6ee2
MD5 hash:
b1bbc7280df281e302e1c28cc2f26c17
SHA1 hash:
f71f9319c4759421f887af24f914f9193c927199
Detections:
FormBook
Create hunting rule
win_formbook_auto
Create hunting rule
win_formbook_g0
Create hunting rule
Link:
https://www.unpac.me/results/6f4de761-2725-4290-916c-d0891459a00d/
Parent samples :
44b473195e8f495f9e53899badaabf0e164b52ec3cc3d73be3c59cc5c570ccd1
66c5b65f8e75acbce3103b6527cc1c32fdb53467c9b22475f36b60b28ed85f26
f4a9a76e7a18ea2e2dcf234b006be09f9fdf1cbd4ac7d88bdf0dced5cb453374
7a0e92402659c86d9da6faf33be3817996718051ea564e34aa43a41606df7be6
548fb330ffeb62ab1fd674a557606885338344c8cc807e2a3f9c64e475bdf2c0
d38f58de7af51ac311b23e3f813e8c33599df3f5fe78661fd8b50b90b7805b22
68cb6a1efb7c442f063eee5ae3f96ae12a3d2fba0852f22aa7a761cf8b1ae31a
SH256 hash:
00babba341e3b51c2ad2c71a37fe48ce7ca0856d4c555f4afb9036c9d55a1ad8
MD5 hash:
360a13bff8a12502b8c1441b4a44bd8c
SHA1 hash:
11a49152cbf717d614d44dba227f051dc4507bf7
Link:
https://www.unpac.me/results/6f4de761-2725-4290-916c-d0891459a00d/
SH256 hash:
66c5b65f8e75acbce3103b6527cc1c32fdb53467c9b22475f36b60b28ed85f26
MD5 hash:
fbca6486149d6f11d5bd8bf08381a50c
SHA1 hash:
c6b5793e7e2bbb9ec7800c3be8c93ce6133e7c08
Link:
https://www.unpac.me/results/6f4de761-2725-4290-916c-d0891459a00d/
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Legit
Score:
0.18
Link:
https://yomi.yoroi.company/submissions/66c5b65f8e75acbce3103b6527cc1c32fdb53467c9b22475f36b60b28ed85f26

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:meth_get_eip
Create hunting rule
Author:Willi Ballenthin
Rule name:meth_stackstrings
Create hunting rule
Author:Willi Ballenthin
Rule name:Windows_Trojan_Formbook
Create hunting rule
Author:@malgamy12
Rule name:Windows_Trojan_Formbook_1112e116
Create hunting rule
Author:Elastic Security
Rule name:win_formbook_auto
Create hunting rule
Author:Felix Bilstein - yara-signator at cocacoding dot com
Description:Detects win.formbook.

File information

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

Web download

Formbook

Executable exe 66c5b65f8e75acbce3103b6527cc1c32fdb53467c9b22475f36b60b28ed85f26

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/2431514/
  
Delivery method
Distributed via web download
Cape
Cape
https://www.capesandbox.com/analysis/338365/

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