MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 a3071d3d586d802ca6e86e641ae978872ab99fe208dc287a12d80fa2562b91a8. 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: 18


Intelligence 18 IOCs YARA 19 File information Comments
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SHA256 hash: a3071d3d586d802ca6e86e641ae978872ab99fe208dc287a12d80fa2562b91a8
SHA3-384 hash: 2531dbd3474eda57226272c48aaf6f2894e9bb8ec55fc258ee3b3eb7faa1da688da4f989125f52e5fdc42064c44baef1
SHA1 hash: fc6b0809717dcf869b816f1b3975c1150722c384
MD5 hash: 3276dce705034a220770c23d60f34c27
humanhash: butter-fix-item-cat
File name:dekont.pdf.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:338'060 bytes
First seen:2023-09-19 16:30:09 UTC
Last seen:2023-09-19 17:34:32 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash 61259b55b8912888e90f516ca08dc514 (1'059 x Formbook, 741 x AgentTesla, 431 x GuLoader)
ssdeep 6144:/Ya6WRmW7aDDKHeu2F6ohGEjQxNVw4TX0NztBULsHaeNC15s+suNEHM:/YIRdaiHL+6ooioV3m7UInQ5sgkM
Threatray 1'944 similar samples on MalwareBazaar
TLSH T1A0742369B3C0955BE0A30730597593A9CEDBB52965324B0BA3E03A8D3D96681C32F7F1
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 b2a89c96a2cada72 (2'283 x Formbook, 981 x Loki, 803 x AgentTesla)
Reporter abuse_ch
Tags:exe FormBook

Intelligence

File Origin
# of uploads :
2
# of downloads :
268
Origin country :
NL NL
Vendor Threat Intelligence
Malware family:
formbook
Create hunting rule
ID:
1
File name:
dekont.pdf.exe
Verdict:
Malicious activity
Analysis date:
2023-09-19 16:58:19 UTC
Tags:
formbook xloader
Link:
https://app.any.run/tasks/a2b1bc78-1371-476b-ac28-e06104843f7d

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/449770/
Detection(s):
SecuriteInfo.com.Trojan.Loader.1550.27294.12529.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a file in the %temp% directory
Creating a window
Creating a process from a recently created file
Launching a process
Сreating synchronization primitives
Launching cmd.exe command interpreter
Setting browser functions hooks
Unauthorized injection to a recently created process by context flags manipulation
Unauthorized injection to a system process
Unauthorized injection to a browser process
Gathering data
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
control lolbin masquerade overlay packed shell32
Link:
https://www.filescan.io/uploads/6509ccc733582f234efc4ae1/reports/47794645-e973-4fab-826e-0b91e636f856/overview
Verdict:
Malicious
Labled as:
Win/malicious_confidence_100%
Link:
https://www.hybrid-analysis.com/sample/a3071d3d586d802ca6e86e641ae978872ab99fe208dc287a12d80fa2562b91a8
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/2e52beb8-e76b-45d9-84d5-34e235e49536
Result
Threat name:
FormBook, NSISDropper
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Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1310966
Signature
Antivirus / Scanner detection for submitted sample
Antivirus detection for URL or domain
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)
Found malware configuration
Initial sample is a PE file and has a suspicious name
Machine Learning detection for dropped file
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
Performs DNS queries to domains with low reputation
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Snort IDS alert for network traffic
System process connects to network (likely due to code injection or exploit)
Tries to detect virtualization through RDTSC time measurements
Uses an obfuscated file name to hide its real file extension (double extension)
Yara detected FormBook
Yara detected NSISDropper
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 1310966 Sample: dekont.pdf.exe Startdate: 19/09/2023 Architecture: WINDOWS Score: 100 50 Snort IDS alert for network traffic 2->50 52 Found malware configuration 2->52 54 Malicious sample detected (through community Yara rule) 2->54 56 10 other signatures 2->56 11 dekont.pdf.exe 18 2->11         started        process3 file4 32 C:\Users\user\AppData\...\aviviezluy.exe, PE32 11->32 dropped 14 aviviezluy.exe 11->14         started        process5 signatures6 68 Multi AV Scanner detection for dropped file 14->68 70 Machine Learning detection for dropped file 14->70 72 Found evasive API chain (may stop execution after reading information in the PEB, e.g. number of processors) 14->72 74 2 other signatures 14->74 17 aviviezluy.exe 14->17         started        process7 signatures8 42 Modifies the context of a thread in another process (thread injection) 17->42 44 Maps a DLL or memory area into another process 17->44 46 Sample uses process hollowing technique 17->46 48 Queues an APC in another process (thread injection) 17->48 20 explorer.exe 8 6 17->20 injected process9 dnsIp10 34 www.5812harold.com 20->34 36 www.rw6dh.top 156.234.201.239, 80 MOACKCOLTD-AS-APMOACKCoLTDKR Seychelles 20->36 38 13 other IPs or domains 20->38 58 System process connects to network (likely due to code injection or exploit) 20->58 60 Performs DNS queries to domains with low reputation 20->60 24 cmstp.exe 12 20->24         started        signatures11 process12 dnsIp13 40 www.rw6dh.top 24->40 62 Modifies the context of a thread in another process (thread injection) 24->62 64 Maps a DLL or memory area into another process 24->64 66 Tries to detect virtualization through RDTSC time measurements 24->66 28 cmd.exe 1 24->28         started        signatures14 process15 process16 30 conhost.exe 28->30         started       
Detection:
formbook
Create hunting rule
Link:
https://mwdb.cert.pl/sample/a3071d3d586d802ca6e86e641ae978872ab99fe208dc287a12d80fa2562b91a8/
Threat name:
Win32.Trojan.Vigorf
Create hunting rule
Status:
Malicious
First seen:
2023-09-18 12:41:58 UTC
File Type:
PE (Exe)
Extracted files:
3
AV detection:
21 of 35 (60.00%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=umdr2pkynwaczjxinzsbv2lyq4vlth7cbdocq6qs3ah2evrlsgua._file
Verdict:
malicious
Label(s):
formbook
Create hunting rule
Similar samples:
545922d6a8c2e95e41d555cac8d3fcd44fa562e92ee1de2d11e3bd0860e5a21a
Formbook
6ab510e025f1d00b20b2272a997b5ebd76249532898cd3188af857cc21df125c
Formbook
7b88e2abbaa9a126435447c3d3c1ee10bba7d9355bad947297409bd6709b59ac
Formbook
837fc8d2a3e348e96ea2db94abbe3319b380496b7329cde30519b26f51c1de88
Formbook
b663d64967ea2c767419bb45189b60b0ff088b8060598a7b914bd284a91c4c92
Formbook
eb24fab8968acfad6a1a28b2399fa0cb0b7dd6e2135116312d8ae0412fcd0543
Formbook
f90f3b5208e8e8089d318234c5e041db74317c142934594530e0486e0329b23f
Formbook
+ 1'934 additional samples on MalwareBazaar
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook campaign:mh21 rat spyware stealer trojan
Link:
https://tria.ge/reports/230919-t1c9eacf42/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of UnmapMainImage
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Suspicious use of SetThreadContext
Executes dropped EXE
Loads dropped DLL
Formbook payload
Formbook
Unpacked files
SH256 hash:
6d6811d829d95221e67673ac9f391e458f9a753110b0ce2bebeb225ac33d00f2
MD5 hash:
17550bb34503e44739b98ae9fc450e1f
SHA1 hash:
a8961b993025b47e455e846f76aafb2a7824b7a7
Detections:
FormBook
Create hunting rule
win_formbook_w0
Create hunting rule
win_formbook_auto
Create hunting rule
win_formbook_g0
Create hunting rule
Link:
https://www.unpac.me/results/8a769877-9d8a-4232-a2b3-e04569f47800/
Parent samples :
b663d64967ea2c767419bb45189b60b0ff088b8060598a7b914bd284a91c4c92
d1e98d098f45c722026716f6b574a056d535813805d00a8cc2f1943efc271fa9
837fc8d2a3e348e96ea2db94abbe3319b380496b7329cde30519b26f51c1de88
7b88e2abbaa9a126435447c3d3c1ee10bba7d9355bad947297409bd6709b59ac
a3071d3d586d802ca6e86e641ae978872ab99fe208dc287a12d80fa2562b91a8
SH256 hash:
268fa5767a0bc3e7f91646af96575aaf2cf733cc3b562129630359e692c5e12b
MD5 hash:
51519e67a6ed50c46cb60c5c75a214eb
SHA1 hash:
69637eea9bee95ca0265b6ec7bd1f55d4314b828
Link:
https://www.unpac.me/results/8a769877-9d8a-4232-a2b3-e04569f47800/
SH256 hash:
a3071d3d586d802ca6e86e641ae978872ab99fe208dc287a12d80fa2562b91a8
MD5 hash:
3276dce705034a220770c23d60f34c27
SHA1 hash:
fc6b0809717dcf869b816f1b3975c1150722c384
Link:
https://www.unpac.me/results/8a769877-9d8a-4232-a2b3-e04569f47800/
Malware family:
FormBook
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/a3071d3d586d/report/overview.html
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/a3071d3d586d802ca6e86e641ae978872ab99fe208dc287a12d80fa2562b91a8

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:cobalt_strike_tmp01925d3f
Create hunting rule
Author:The DFIR Report
Description:files - file ~tmp01925d3f.exe
Reference:https://thedfirreport.com
Rule name:DebuggerCheck__API
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:DebuggerCheck__GlobalFlags
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:DebuggerCheck__QueryInfo
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:DebuggerHiding__Active
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:DebuggerHiding__Thread
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:maldoc_find_kernel32_base_method_1
Create hunting rule
Author:Didier Stevens (https://DidierStevens.com)
Rule name:maldoc_getEIP_method_1
Create hunting rule
Author:Didier Stevens (https://DidierStevens.com)
Rule name:MD5_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for MD5 constants
Rule name:meth_get_eip
Create hunting rule
Author:Willi Ballenthin
Rule name:meth_stackstrings
Create hunting rule
Author:Willi Ballenthin
Rule name:RIPEMD160_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for RIPEMD-160 constants
Rule name:SEH__vectored
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
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: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.
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 a3071d3d586d802ca6e86e641ae978872ab99fe208dc287a12d80fa2562b91a8

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/449770/

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