MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 4a91d8f52d07bcd7fde157c6b56e2881c4abba94a0f7921633da4ae2bba53074. 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: 12


Intelligence 12 IOCs YARA 3 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 4a91d8f52d07bcd7fde157c6b56e2881c4abba94a0f7921633da4ae2bba53074
SHA3-384 hash: e340a9db4f6bd314b81aa2cbb68c0d10b321986788514fb8f6f44cc1546933088961684c4b300943a04a4aed86252078
SHA1 hash: 5597636fe0d024ad1831b30cc5b16764847a2085
MD5 hash: a3e29a08e40f22092782a69ada250f36
humanhash: quiet-zulu-montana-bulldog
File name:4444.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:470'528 bytes
First seen:2021-09-10 07:52:04 UTC
Last seen:2021-09-10 13:27:55 UTC
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:GFx0I9i7r6aTCNQKHQkjqxtnQOrmR4rEKzO1y:G2ui7OACQKnjqzQOrXrE6
Threatray 9'173 similar samples on MalwareBazaar
TLSH T164A4121A32648D2FCFBE0AFCC0612645CBBA811265C3FEDC1FA161DA61D27D9B54439B
dhash icon 022c5b52a6a456a9 (8 x Formbook, 7 x AgentTesla, 3 x Loki)
Reporter GovCERT_CH
Tags:exe FormBook xloader

Intelligence

File Origin
# of uploads :
2
# of downloads :
268
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
4444.exe
Verdict:
Malicious activity
Analysis date:
2021-09-10 07:53:41 UTC
Tags:
trojan formbook stealer
Link:
https://app.any.run/tasks/57dbebb7-7a53-4ec1-9f36-fb0512637e67

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/186813/
Detection(s):
SecuriteInfo.com.MSIL.Kryptik.VFR-1.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Sending a UDP request
Launching a process
Creating a file
Launching cmd.exe command interpreter
Unauthorized injection to a system process
Malware family:
Formbook
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Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/8e13c0a1-7a13-4a2f-a136-834c2c26d93e
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/848645
Signature
.NET source code contains potential unpacker
Antivirus detection for URL or domain
C2 URLs / IPs found in malware configuration
Found malware configuration
Injects a PE file into a foreign processes
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 submitted file
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Sigma detected: Bad Opsec Defaults Sacrificial Processes With Improper Arguments
Sigma detected: CMSTP Execution Process Creation
Snort IDS alert for network traffic (e.g. based on Emerging Threat rules)
System process connects to network (likely due to code injection or exploit)
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Tries to detect virtualization through RDTSC time measurements
Writes to foreign memory regions
Yara detected AntiVM3
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 481076 Sample: 4444.exe Startdate: 10/09/2021 Architecture: WINDOWS Score: 100 31 www.rinstech.net 2->31 33 rinstech.net 2->33 41 Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) 2->41 43 Found malware configuration 2->43 45 Malicious sample detected (through community Yara rule) 2->45 47 9 other signatures 2->47 11 4444.exe 3 2->11         started        signatures3 process4 file5 29 C:\Users\user\AppData\Local\...\4444.exe.log, ASCII 11->29 dropped 57 Writes to foreign memory regions 11->57 59 Injects a PE file into a foreign processes 11->59 15 RegSvcs.exe 11->15         started        signatures6 process7 signatures8 61 Modifies the context of a thread in another process (thread injection) 15->61 63 Maps a DLL or memory area into another process 15->63 65 Sample uses process hollowing technique 15->65 67 2 other signatures 15->67 18 explorer.exe 15->18 injected process9 dnsIp10 35 nashautoglass.com 50.87.197.86, 49831, 80 UNIFIEDLAYER-AS-1US United States 18->35 37 www.hearthomelife.com 74.220.199.6, 49835, 80 UNIFIEDLAYER-AS-1US United States 18->37 39 9 other IPs or domains 18->39 49 System process connects to network (likely due to code injection or exploit) 18->49 22 cmstp.exe 18->22         started        signatures11 process12 signatures13 51 Modifies the context of a thread in another process (thread injection) 22->51 53 Maps a DLL or memory area into another process 22->53 55 Tries to detect virtualization through RDTSC time measurements 22->55 25 cmd.exe 1 22->25         started        process14 process15 27 conhost.exe 25->27         started       
Detection:
formbook
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Link:
https://mwdb.cert.pl/sample/4a91d8f52d07bcd7fde157c6b56e2881c4abba94a0f7921633da4ae2bba53074/
Threat name:
ByteCode-MSIL.Spyware.Noon
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Status:
Malicious
First seen:
2021-09-10 04:06:59 UTC
AV detection:
9 of 45 (20.00%)
Threat level:
  2/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=jki5r5jna66np7pbk7dlk3riqhckxouuud3zefrt3jfofo5fgb2a._file
Verdict:
malicious
Label(s):
formbook
Create hunting rule
Similar samples:
34f75f8458b1f58bdb1e8ff1a46270f98c6d246d213413cd0c4a7708e15e82c9
Formbook
55e967fecbdcb5166af6a5a6b8d09db0ca26582ed70d170a248a4d1e69c9a8c9
Formbook
5bc9d0c8fd02f1c138178b1291378304a653717076f9e12ba4334609dcf7b11c
Formbook
7af335cb2a2646ddadf12f730585a217523da868aaeb12ba621b367c1b942693
Formbook
7e75dded768c2260cd9845daa4502ab5ebd269eee077dd5dd573a9ffcb4da70d
Formbook
a086821049463b0bfc414cb3763c4f82688182d2d018ae5c9cd472f59f9e36ff
Formbook
acf3df7da4bdf99226ab8574e15d1145e46e28605afdf660f1fb19b1d061c386
Formbook
c840ee368fcab5974485c16fc456b1dc1923cc5e113ce6a96f6f314a7ec5ac94
Formbook
+ 9'163 additional samples on MalwareBazaar
Result
Malware family:
xloader
Create hunting rule
Score:
  10/10
Tags:
family:xloader campaign:t75f loader rat
Link:
https://tria.ge/reports/210910-jqflnshfh2/
Behaviour
Gathers network information
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of UnmapMainImage
Suspicious use of WriteProcessMemory
Suspicious use of SetThreadContext
Xloader Payload
Xloader
Malware Config
C2 Extraction:
http://www.vertexnailsblaine.com/t75f/
Unpacked files
SH256 hash:
034c645316c78acb2b9110f9bfd8b840b981489bab385e8c39912ec5c7c4f1c9
MD5 hash:
d17b3ace9f0ca124101674d27328cbf6
SHA1 hash:
8ed2472b79df133a2d6cc73cbed726c444b91bff
Detections:
win_formbook_g0
Create hunting rule
win_formbook_auto
Create hunting rule
Link:
https://www.unpac.me/results/7e3a958c-69a3-4f61-8d2b-dd5e40474bf3/
Parent samples :
7af335cb2a2646ddadf12f730585a217523da868aaeb12ba621b367c1b942693
5bc9d0c8fd02f1c138178b1291378304a653717076f9e12ba4334609dcf7b11c
c840ee368fcab5974485c16fc456b1dc1923cc5e113ce6a96f6f314a7ec5ac94
34f75f8458b1f58bdb1e8ff1a46270f98c6d246d213413cd0c4a7708e15e82c9
4a91d8f52d07bcd7fde157c6b56e2881c4abba94a0f7921633da4ae2bba53074
43d831616e23a03c055971bc1c7c9ae0e87f491976e72ce8fa0074610f004488
SH256 hash:
865936fa0b452900b7964d5c1d739a3c980df1948bcab98801b68ac5389a2b5e
MD5 hash:
44176af362af8e8fc97c1e5dd918cdba
SHA1 hash:
c49b9b1f75f99c22d950c278cc1889d115d7d4f1
Link:
https://www.unpac.me/results/7e3a958c-69a3-4f61-8d2b-dd5e40474bf3/
SH256 hash:
ad4a7895d529d5164302bb88596964ab42ff125bf0f5544418c80b6d438cb587
MD5 hash:
43ababb6b0a02907aad43084f12b10d9
SHA1 hash:
b60ba705891d5a666d64300181b475a46714ffa8
Link:
https://www.unpac.me/results/7e3a958c-69a3-4f61-8d2b-dd5e40474bf3/
SH256 hash:
4a91d8f52d07bcd7fde157c6b56e2881c4abba94a0f7921633da4ae2bba53074
MD5 hash:
a3e29a08e40f22092782a69ada250f36
SHA1 hash:
5597636fe0d024ad1831b30cc5b16764847a2085
Link:
https://www.unpac.me/results/7e3a958c-69a3-4f61-8d2b-dd5e40474bf3/
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/4a91d8f52d07/report/overview.html
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Suspicious File
Score:
0.54
Link:
https://yomi.yoroi.company/submissions/4a91d8f52d07bcd7fde157c6b56e2881c4abba94a0f7921633da4ae2bba53074

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:pe_imphash
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Rule name:pe_imphash
Create hunting rule
Rule name:Skystars_Malware_Imphash
Create hunting rule
Author:Skystars LightDefender
Description:imphash

File information

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

Malspam

Formbook

Executable exe 4a91d8f52d07bcd7fde157c6b56e2881c4abba94a0f7921633da4ae2bba53074

(this sample)

  
Dropped by
xloader
  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/186813/

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