MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 a998850fc7940055baac6f61dde2d0e29836c9386ac87555549eeaa1a9998401. 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: 9


Intelligence 9 IOCs YARA File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: a998850fc7940055baac6f61dde2d0e29836c9386ac87555549eeaa1a9998401
SHA3-384 hash: 2760832184993865b9fa48970088d23708d3b7bd2ead262ff337dbc929317e7ad133f7af99eab8c7a75cafde67a348a1
SHA1 hash: 2d40157583a3dc4553bc4fc1f3a601d274e14691
MD5 hash: 55e0e0b024886daa5ebb3664ce8fd4c7
humanhash: rugby-beryllium-texas-don
File name:REVISED PROFORMA_XLS.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:734'208 bytes
First seen:2020-10-08 17:44:52 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'649 x AgentTesla, 19'452 x Formbook, 12'202 x SnakeKeylogger)
ssdeep 12288:uloYr/pYM6gs7Ms8Umz7mgEv9CQYfmh16lRd1VuYg4dZSMvLB57XVnVrIHDbm:oz/prs79G7mTvFYfm+n1w4dVvd57XVVu
Threatray 2'390 similar samples on MalwareBazaar
TLSH 7EF42204A4F95B13C9BD87FE8A86995193F5E123B967D3C94EC932DA39E7B040087D43
Reporter abuse_ch
Tags:exe FormBook


Avatar
abuse_ch
Malspam distributing unidentified malware:

HELO: cpshared6.tedata.net
Sending IP: 213.158.180.196
From: Sales Department <hyejinp51@yongbee.co.kr>
Subject: PROFORMA INVOICE
Attachment: REVISED PROFORMA_XLS.arj (contains "REVISED PROFORMA_XLS.exe")

Intelligence

File Origin
# of uploads :
1
# of downloads :
135
Origin country :
n/a
Vendor Threat Intelligence
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/69322/
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Sending a UDP request
Unauthorized injection to a recently created process
Creating a file
Launching a process
Launching cmd.exe command interpreter
Unauthorized injection to a system process
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/485870
Signature
Antivirus / Scanner detection for submitted sample
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
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
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 295380 Sample: REVISED PROFORMA_XLS.exe Startdate: 08/10/2020 Architecture: WINDOWS Score: 100 33 cdn.onenote.net 2->33 41 Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) 2->41 43 Malicious sample detected (through community Yara rule) 2->43 45 Antivirus / Scanner detection for submitted sample 2->45 47 6 other signatures 2->47 11 REVISED PROFORMA_XLS.exe 3 2->11         started        signatures3 process4 file5 31 C:\Users\...\REVISED PROFORMA_XLS.exe.log, ASCII 11->31 dropped 57 Injects a PE file into a foreign processes 11->57 15 REVISED PROFORMA_XLS.exe 11->15         started        18 REVISED PROFORMA_XLS.exe 11->18         started        signatures6 process7 signatures8 59 Modifies the context of a thread in another process (thread injection) 15->59 61 Maps a DLL or memory area into another process 15->61 63 Sample uses process hollowing technique 15->63 65 Queues an APC in another process (thread injection) 15->65 20 explorer.exe 15->20 injected process9 dnsIp10 35 mybriefbox.com 34.102.136.180, 49752, 80 GOOGLEUS United States 20->35 37 shops.myshopify.com 23.227.38.64, 49757, 49758, 80 CLOUDFLARENETUS Canada 20->37 39 4 other IPs or domains 20->39 49 System process connects to network (likely due to code injection or exploit) 20->49 24 control.exe 20->24         started        signatures11 process12 signatures13 51 Modifies the context of a thread in another process (thread injection) 24->51 53 Maps a DLL or memory area into another process 24->53 55 Tries to detect virtualization through RDTSC time measurements 24->55 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/a998850fc7940055baac6f61dde2d0e29836c9386ac87555549eeaa1a9998401/
Threat name:
ByteCode-MSIL.Trojan.AgentTesla
Create hunting rule
Status:
Malicious
First seen:
2020-10-08 17:19:51 UTC
AV detection:
26 of 29 (89.66%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=vgmikd6hsqaflovmn5q53ywq4kmdnsjynlehkvkut3vkdkmzqqaq._file
Verdict:
malicious
Label(s):
formbook
Create hunting rule
Similar samples:
04cfc683167a0462256cdf6a6f29ae3e628b09ff0d6052b569edfb0ada348c10
Formbook
07528f3c583c546d2b444b091c3ede380c6427ed0691b95294c7e32dd35560ab
Formbook
4ba0d07d32c048141100317f95bd6dd8b791ba9c6608730b8408530490a13922
Formbook
89bf15eae14f60d6acc308cead31f09459947626b9839bbbddbf76f00821fe3b
Formbook
b19d067a87767c377a60981192e5edb9256ce11f7d663cdcae2af3d8d0c0c382
Formbook
d4014ac2689b47f11708425cad3d8aa02dd05ee6d6745006156dffbe0a27b4be
Formbook
d7d1d6057e7e731b75e1ba9579ccfe717334cc7b4f59324af1a0aa179db22e68
Formbook
da111408d9dccb99b2c429d535ca55f6e970d911da4c24553e75d02fe9c00489
Formbook
ebd88634ecfbdc7e88bca32a0b22fa35e24c9feb309799128f3d12d2cceac224
Formbook
f4854fb409d136b74193144c50c888b36bbbbcde71b52acb5f8177a862ebd76c
Formbook
+ 2'380 additional samples on MalwareBazaar
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
rat trojan spyware stealer family:formbook
Link:
https://tria.ge/reports/201008-zzwaycb4xs/
Behaviour
Enumerates system info in registry
Suspicious behavior: EnumeratesProcesses
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
Malware Config
C2 Extraction:
http://www.mybriefbox.com/sdk/
Unpacked files
SH256 hash:
a998850fc7940055baac6f61dde2d0e29836c9386ac87555549eeaa1a9998401
MD5 hash:
55e0e0b024886daa5ebb3664ce8fd4c7
SHA1 hash:
2d40157583a3dc4553bc4fc1f3a601d274e14691
Link:
https://www.unpac.me/results/4c42b432-2791-487f-9a0f-efe5068192e0/
SH256 hash:
607f04646c9f16f7c23fa69d4b8f660fc7c44d40e4f73a0c70a2b315debdaa8b
MD5 hash:
a90baadadf904455325f7bc787185c7b
SHA1 hash:
7d833bb819d638008c98be469b05db2feaf201cd
Link:
https://www.unpac.me/results/4c42b432-2791-487f-9a0f-efe5068192e0/
SH256 hash:
aab2e27d6414a6455d1c4b86d2ad664168a5c7b3b503f00ae3fa9e2efd87cb31
MD5 hash:
9dc20ef0d18643a5eca5b3288a662310
SHA1 hash:
ea49e0f8e787dac103c6bb41822c8908a45bf40c
Link:
https://www.unpac.me/results/4c42b432-2791-487f-9a0f-efe5068192e0/
SH256 hash:
d4acd33258b1d3ed7b0aee563686718cfe4e47fa16b002efdecd03b6eae7394b
MD5 hash:
88f7bb341e6d5f3c2a94fa5de3603371
SHA1 hash:
d3be8988a2bf621993bcd71ebf7ecf4e1d60799d
Detections:
win_formbook_g0
Create hunting rule
win_formbook_auto
Create hunting rule
Link:
https://www.unpac.me/results/4c42b432-2791-487f-9a0f-efe5068192e0/
Parent samples :
a998850fc7940055baac6f61dde2d0e29836c9386ac87555549eeaa1a9998401
765c1e7486aedffd7021ae5f15c86e549c7b796a5025249781f9c8a6327f4037
af61853ca27001c0721463fce68bb033a9084e9fcd0c6ced3acd7fc3ea0e957a
d085d4d4370b02036dfe9de7c9061d88a8a5cd12cbced6dbdca9ba217112375c
410b12d131a36c0b5be88c52e6ad02a1e50b20c4d80f30de42ea5a260fc92624
4e98a7f7084a5fa80d8e1dd45e8b8f8a1f9fc891d223cc265524cfcfe3c57c0b
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Suspicious File
Score:
0.45
Link:
https://yomi.yoroi.company/submissions/a998850fc7940055baac6f61dde2d0e29836c9386ac87555549eeaa1a9998401

File information

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

Malspam

Formbook

zip 5523f788b6b921689b9078667e01d1c280dde63baa431d81afd845d78f72748b

Formbook

Executable exe a998850fc7940055baac6f61dde2d0e29836c9386ac87555549eeaa1a9998401

(this sample)

  
Dropped by
MD5 77d67710eac40c282a243fd29b9ecc06
  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/69322/
  
Dropped by
SHA256 5523f788b6b921689b9078667e01d1c280dde63baa431d81afd845d78f72748b

Comments