MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 837fc8d2a3e348e96ea2db94abbe3319b380496b7329cde30519b26f51c1de88. 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: 17


Intelligence 17 IOCs YARA 23 File information Comments
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SHA256 hash: 837fc8d2a3e348e96ea2db94abbe3319b380496b7329cde30519b26f51c1de88
SHA3-384 hash: 7a3e883aef13debc3bc98944aa3161936b6a9879d0ce715fcc84aa7f2e67428a360847c896cbf729854971077c878b2f
SHA1 hash: aaac23729120d0515f11e57e9a1c0bb52ff517de
MD5 hash: 68e81732f7b3b06be645ef5bccd8e419
humanhash: april-romeo-ink-april
File name:e-dekont.pdf.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:364'342 bytes
First seen:2023-09-04 16:20:01 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash 61259b55b8912888e90f516ca08dc514 (1'059 x Formbook, 741 x AgentTesla, 431 x GuLoader)
ssdeep 6144:/Ya67Z+/XILeburh5lX8sH/DWwYMY/o+ztDGZr6JF/yMJ/q2cEjczf863Z58tKJC:/YpOOpN5pp6wYMY3xDymnaMJCaM863Zg
Threatray 1'985 similar samples on MalwareBazaar
TLSH T1B174225A6AD4D05BF22202314CB29E175FAAFA261538539F2F71455EBEA33E3C10DB31
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 geo TUR

Intelligence

File Origin
# of uploads :
1
# of downloads :
322
Origin country :
NL NL
Vendor Threat Intelligence
Malware family:
formbook
Create hunting rule
ID:
1
File name:
e-dekont.pdf.exe
Verdict:
Malicious activity
Analysis date:
2023-09-04 16:20:37 UTC
Tags:
formbook xloader stealer spyware
Link:
https://app.any.run/tasks/cdb2f39c-371d-4eec-884c-3939f10ffdff

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/446132/
Detection(s):
Sanesecurity.Malware.28947.BadP.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
Searching for the window
Launching a process
Сreating synchronization primitives
Launching cmd.exe command interpreter
Sending a custom TCP request
Setting browser functions hooks
Unauthorized injection to a recently created process by context flags manipulation
Forced shutdown of a system process
Unauthorized injection to a system process
Unauthorized injection to a browser process
Gathering data
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
control lolbin masquerade overlay packed shell32
Link:
https://www.filescan.io/uploads/64f603b8e29c52e38dc74899/reports/8e6a2618-53c2-4153-85b2-bd3eb342bd45/overview
Verdict:
Malicious
Labled as:
Win/malicious_confidence_100%
Link:
https://www.hybrid-analysis.com/sample/837fc8d2a3e348e96ea2db94abbe3319b380496b7329cde30519b26f51c1de88
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/03c22b43-901c-4aec-9781-845bab3e7648
Result
Threat name:
FormBook, NSISDropper
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Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1303067
Signature
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 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 dnsIp2 2 Behavior Graph ID: 1303067 Sample: e-dekont.pdf.exe Startdate: 04/09/2023 Architecture: WINDOWS Score: 100 36 www.simplebly.store 2->36 52 Snort IDS alert for network traffic 2->52 54 Found malware configuration 2->54 56 Malicious sample detected (through community Yara rule) 2->56 58 9 other signatures 2->58 12 e-dekont.pdf.exe 18 2->12         started        signatures3 process4 file5 34 C:\Users\user\AppData\...\fdvazbckgj.exe, PE32 12->34 dropped 15 fdvazbckgj.exe 1 12->15         started        process6 signatures7 70 Multi AV Scanner detection for dropped file 15->70 72 Found evasive API chain (may stop execution after reading information in the PEB, e.g. number of processors) 15->72 74 Maps a DLL or memory area into another process 15->74 76 Tries to detect virtualization through RDTSC time measurements 15->76 18 fdvazbckgj.exe 15->18         started        21 conhost.exe 15->21         started        process8 signatures9 44 Modifies the context of a thread in another process (thread injection) 18->44 46 Maps a DLL or memory area into another process 18->46 48 Sample uses process hollowing technique 18->48 50 Queues an APC in another process (thread injection) 18->50 23 explorer.exe 6 18->23 injected process10 dnsIp11 38 www.olkja.xyz 203.161.54.43, 49740, 80 VNPT-AS-VNVNPTCorpVN Malaysia 23->38 40 www.simplebly.store 172.105.126.100, 80 LINODE-APLinodeLLCUS United States 23->40 42 4 other IPs or domains 23->42 60 System process connects to network (likely due to code injection or exploit) 23->60 62 Performs DNS queries to domains with low reputation 23->62 27 cmstp.exe 23->27         started        signatures12 process13 signatures14 64 Modifies the context of a thread in another process (thread injection) 27->64 66 Maps a DLL or memory area into another process 27->66 68 Tries to detect virtualization through RDTSC time measurements 27->68 30 cmd.exe 1 27->30         started        process15 process16 32 conhost.exe 30->32         started       
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/837fc8d2a3e348e96ea2db94abbe3319b380496b7329cde30519b26f51c1de88/
Threat name:
Win32.Trojan.FormBook
Create hunting rule
Status:
Malicious
First seen:
2023-09-04 10:28:29 UTC
File Type:
PE (Exe)
Extracted files:
3
AV detection:
21 of 24 (87.50%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=qn74ruvd4neos3vc3okkxprtdgzyasllomu43yyfdgzg6uob32ea._file
Verdict:
malicious
Label(s):
formbook
Create hunting rule
Similar samples:
545922d6a8c2e95e41d555cac8d3fcd44fa562e92ee1de2d11e3bd0860e5a21a
Formbook
6ab510e025f1d00b20b2272a997b5ebd76249532898cd3188af857cc21df125c
Formbook
92f7889579c919e3c4a5f65717a71ccf029ea1118d3b70969a2c85276cb61698
Formbook
b0302231ae277b08e383cef527b093307edf552a1777b5c9a088e2e1c61ad6fe
Formbook
b663d64967ea2c767419bb45189b60b0ff088b8060598a7b914bd284a91c4c92
Formbook
eb24fab8968acfad6a1a28b2399fa0cb0b7dd6e2135116312d8ae0412fcd0543
Formbook
f6530f654262274b3f1debb0bc6b3de7686fd551224a03a3d0814b45c7e431ea
Formbook
+ 1'975 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/230904-ts4fmahf82/
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
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/1b4e9a8c-edab-46bd-94a0-6484d9deb463/
Parent samples :
b663d64967ea2c767419bb45189b60b0ff088b8060598a7b914bd284a91c4c92
d1e98d098f45c722026716f6b574a056d535813805d00a8cc2f1943efc271fa9
837fc8d2a3e348e96ea2db94abbe3319b380496b7329cde30519b26f51c1de88
7b88e2abbaa9a126435447c3d3c1ee10bba7d9355bad947297409bd6709b59ac
a3071d3d586d802ca6e86e641ae978872ab99fe208dc287a12d80fa2562b91a8
SH256 hash:
d261b4241c77e9d362b0876c9dcef509e4c23ea2dd88bb3052f76155a30dc646
MD5 hash:
765fd0073777fa17c2e48904593c31d9
SHA1 hash:
4144d6b59acf2c48d34917140b69a1fe42354f60
Link:
https://www.unpac.me/results/1b4e9a8c-edab-46bd-94a0-6484d9deb463/
SH256 hash:
837fc8d2a3e348e96ea2db94abbe3319b380496b7329cde30519b26f51c1de88
MD5 hash:
68e81732f7b3b06be645ef5bccd8e419
SHA1 hash:
aaac23729120d0515f11e57e9a1c0bb52ff517de
Link:
https://www.unpac.me/results/1b4e9a8c-edab-46bd-94a0-6484d9deb463/
Malware family:
FormBook
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/837fc8d2a3e3/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/837fc8d2a3e348e96ea2db94abbe3319b380496b7329cde30519b26f51c1de88

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:azov_Dropped
Create hunting rule
Author:Potatech
Description:Azov Detection
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 837fc8d2a3e348e96ea2db94abbe3319b380496b7329cde30519b26f51c1de88

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/446132/

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