MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 87b7df6f5ec9193ab04a19a1f2d87a4920ccee54bd4583d9a2d2fa6512c8cf0b. 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: 16


Intelligence 16 IOCs YARA 5 File information Comments
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SHA256 hash: 87b7df6f5ec9193ab04a19a1f2d87a4920ccee54bd4583d9a2d2fa6512c8cf0b
SHA3-384 hash: 4f00a99bfec4fdedb7e61f75ebba516825c42e37ee6af2451c3b8767d16eae3c49fa6ace4924b69acb63f1d7bd2af354
SHA1 hash: 4efa07e5da5360159b220414a5ecd2fcdec69b2a
MD5 hash: 172f2be4796290c1e1431515b9ea6e28
humanhash: don-hawaii-white-washington
File name:microsoft_update.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:482'816 bytes
First seen:2021-12-24 07:19:19 UTC
Last seen:2021-12-24 09:16:26 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'662 x AgentTesla, 19'477 x Formbook, 12'208 x SnakeKeylogger)
ssdeep 6144:qF1lTmWFRSTsi3pnGMaLe9A3imz2vilL5Ducf9CgjGHewWXABbtq5yiMt7ay6AbP:qF15i3pGzL36qLdPkgiH8mkwbqJi
TLSH T15BA4D04639D9E3A4F87BE7B50CB4758147F9F1E1E651E8DEFE85088998A2F004F40A72
Reporter GovCERT_CH
Tags:exe FormBook

Intelligence

File Origin
# of uploads :
2
# of downloads :
196
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
microsoft_update.exe
Verdict:
Malicious activity
Analysis date:
2021-12-24 07:20:32 UTC
Tags:
trojan formbook stealer
Link:
https://app.any.run/tasks/4e68fda1-ceb8-4a92-8914-c1f71a572bed

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/216099/
Detection(s):
SecuriteInfo.com.Trojan.Inject4.22959.26679.5683.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
DNS request
Creating a window
Sending a custom TCP request
Unauthorized injection to a recently created process
Creating a file
Launching a process
Сreating synchronization primitives
Launching cmd.exe command interpreter
Searching for synchronization primitives
Setting browser functions hooks
Unauthorized injection to a system process
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
obfuscated packed
Link:
https://www.filescan.io/uploads/61c574a68991ba72b3951516/reports/511f460e-2c82-4702-9d3e-c3e2e6522d64/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:
Formbook
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/c74439a6-e14c-4649-9fdc-6ec1a2ab471f
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/912347
Signature
.NET source code contains very large strings
Antivirus / Scanner detection for submitted sample
C2 URLs / IPs found in malware configuration
Found malware configuration
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)
Modifies the prolog of user mode functions (user mode inline hooks)
Multi AV Scanner detection for submitted file
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Self deletion via cmd delete
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
Uses ipconfig to lookup or modify the Windows network settings
Yara detected AntiVM3
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 544822 Sample: microsoft_update.exe Startdate: 24/12/2021 Architecture: WINDOWS Score: 100 33 www.schooloftutorials.com 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 microsoft_update.exe 3 2->11         started        signatures3 process4 file5 31 C:\Users\user\...\microsoft_update.exe.log, ASCII 11->31 dropped 61 Tries to detect virtualization through RDTSC time measurements 11->61 63 Injects a PE file into a foreign processes 11->63 15 microsoft_update.exe 11->15         started        18 microsoft_update.exe 11->18         started        signatures6 process7 signatures8 65 Modifies the context of a thread in another process (thread injection) 15->65 67 Maps a DLL or memory area into another process 15->67 69 Sample uses process hollowing technique 15->69 71 Queues an APC in another process (thread injection) 15->71 20 explorer.exe 15->20 injected process9 dnsIp10 35 www.schoolgain.com 20->35 37 www.leathermartuk.com 20->37 39 2 other IPs or domains 20->39 49 System process connects to network (likely due to code injection or exploit) 20->49 51 Uses ipconfig to lookup or modify the Windows network settings 20->51 24 ipconfig.exe 20->24         started        signatures11 process12 signatures13 53 Self deletion via cmd delete 24->53 55 Modifies the context of a thread in another process (thread injection) 24->55 57 Maps a DLL or memory area into another process 24->57 59 Tries to detect virtualization through RDTSC time measurements 24->59 27 cmd.exe 1 24->27         started        process14 process15 29 conhost.exe 27->29         started       
Detection:
formbook
Create hunting rule
Link:
https://mwdb.cert.pl/sample/87b7df6f5ec9193ab04a19a1f2d87a4920ccee54bd4583d9a2d2fa6512c8cf0b/
Threat name:
ByteCode-MSIL.Trojan.AgentTesla
Create hunting rule
Status:
Malicious
First seen:
2021-12-24 05:37:43 UTC
File Type:
PE (.Net Exe)
Extracted files:
10
AV detection:
28 of 43 (65.12%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=q6356326zemtvmckdgq7fwd2jeqmz3suxvcyhwnc2l5gkewiz4fq._file
Verdict:
malicious
Label(s):
formbook
Create hunting rule
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook campaign:st28 rat spyware stealer trojan
Link:
https://tria.ge/reports/211224-h54rdacef2/
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
Suspicious use of SetThreadContext
Deletes itself
Formbook Payload
Formbook
Unpacked files
SH256 hash:
550baec93fdb67462ebb97d3b86711596d3c903a2303694805180b5ca621a2c0
MD5 hash:
5f149575ae76af9452a2ea5bce91ebf3
SHA1 hash:
e3d96ee81df0defc3b46f1c6b82f1907e773af9f
Detections:
win_formbook_g0
Create hunting rule
win_formbook_auto
Create hunting rule
Link:
https://www.unpac.me/results/34a47a64-875b-4bae-b48c-ea43e893b345/
Parent samples :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 hash:
79823e47436e129def4fba8ee225347a05b7bb27477fb1cc8be6dc9e9ce75696
MD5 hash:
39f524c1ab0eb76dfd79b2852e5e8c39
SHA1 hash:
428018e1701006744e34480b0029982a76d8a57d
Link:
https://www.unpac.me/results/34a47a64-875b-4bae-b48c-ea43e893b345/
SH256 hash:
a76976c556189f512ea3dfc72ad520a0923865376f35844ff7d41bd1e62da37c
MD5 hash:
2c8e88cfdd3d161e7b47e470874bd66d
SHA1 hash:
0989ceaea3b90c0a9e5ee6d0b47f5fd36eda9f95
Link:
https://www.unpac.me/results/34a47a64-875b-4bae-b48c-ea43e893b345/
SH256 hash:
87b7df6f5ec9193ab04a19a1f2d87a4920ccee54bd4583d9a2d2fa6512c8cf0b
MD5 hash:
172f2be4796290c1e1431515b9ea6e28
SHA1 hash:
4efa07e5da5360159b220414a5ecd2fcdec69b2a
Link:
https://www.unpac.me/results/34a47a64-875b-4bae-b48c-ea43e893b345/
Malware family:
FormBook
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/87b7df6f5ec9/report/overview.html
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
0.71
Link:
https://yomi.yoroi.company/submissions/87b7df6f5ec9193ab04a19a1f2d87a4920ccee54bd4583d9a2d2fa6512c8cf0b

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:JPCERT/CC Incident Response Group
Description:detect Formbook in memory
Reference:internal research
Rule name:INDICATOR_SUSPICIOUS_Stomped_PECompilation_Timestamp_InTheFuture
Create hunting rule
Author:ditekSHen
Description:Detect executables with stomped PE compilation timestamp that is greater than local current time
Rule name:pe_imphash
Create hunting rule
Rule name:Skystars_Malware_Imphash
Create hunting rule
Author:Skystars LightDefender
Description:imphash
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.

Malspam

Formbook

Executable exe 87b7df6f5ec9193ab04a19a1f2d87a4920ccee54bd4583d9a2d2fa6512c8cf0b

(this sample)

  
Dropped by
Formbook
  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/216099/

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