MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 41ceb21d5f34451ddc166d2891c03c3af37ac0f2a055f5e274948b14c0f5a187. 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 7 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 41ceb21d5f34451ddc166d2891c03c3af37ac0f2a055f5e274948b14c0f5a187
SHA3-384 hash: 21ed4b5c48c049bf690040be255d22cf76a407d78f6b7e1d52dc8e77d4a0ab18372539d8a86fa6a6ecfe6beab9c8f668
SHA1 hash: de3b01aae8ce817d6d091ad6bd17f484c1832d4f
MD5 hash: 325d14fe27a3b2a6cf35c604286b30a8
humanhash: beer-table-happy-juliet
File name:Dekont.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:243'254 bytes
First seen:2023-03-14 13:38:48 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash 61259b55b8912888e90f516ca08dc514 (1'059 x Formbook, 741 x AgentTesla, 427 x GuLoader)
ssdeep 6144:PYa62863TgrVl42oJpOgUkS4TU70Cfitvm9HrHID:PYg8xrVlBWpiu0etELa
Threatray 2'404 similar samples on MalwareBazaar
TLSH T1743412217585C463E4B31B325EFD139AAE57EE290266878F47A06F8CF6723422D0F764
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 lowmal3
Tags:exe FormBook

Intelligence

File Origin
# of uploads :
1
# of downloads :
247
Origin country :
DE DE
Vendor Threat Intelligence
Malware family:
formbook
Create hunting rule
ID:
1
File name:
Dekont.exe
Verdict:
Malicious activity
Analysis date:
2023-03-14 13:40:43 UTC
Tags:
formbook xloader
Link:
https://app.any.run/tasks/8b2c2715-19a9-4375-acbc-b2cd0897d7e2

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/374242/
Detection(s):
SecuriteInfo.com.Trojan.Loader.1341.16335.6114.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
Sending a custom TCP request
Launching a process
Searching for synchronization primitives
Сreating synchronization primitives
Launching cmd.exe command interpreter
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
Result
Malware family:
n/a
Score:
  5/10
Tags:
n/a
Link:
https://dragonfly.certego.net/analysis/73093/overview
Behaviour
MalwareBazaar
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
comodo formbook nemesis overlay packed remcos shell32.dll
Link:
https://www.filescan.io/uploads/641078f806c49bd8b6b5b64d/reports/63e5d8e1-8be9-48b8-af49-3d29de538c75/overview
Verdict:
Malicious
Labled as:
Win/malicious_confidence_100%
Link:
https://www.hybrid-analysis.com/sample/41ceb21d5f34451ddc166d2891c03c3af37ac0f2a055f5e274948b14c0f5a187
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/017b93ba-4818-4c7e-8f4e-4e5517ebcd98
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1193327
Signature
Antivirus detection for dropped file
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)
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 domain / URL
Multi AV Scanner detection for submitted file
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
System process connects to network (likely due to code injection or exploit)
Tries to detect virtualization through RDTSC time measurements
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 826233 Sample: Dekont.exe Startdate: 14/03/2023 Architecture: WINDOWS Score: 100 51 Multi AV Scanner detection for domain / URL 2->51 53 Malicious sample detected (through community Yara rule) 2->53 55 Antivirus detection for URL or domain 2->55 57 5 other signatures 2->57 11 Dekont.exe 19 2->11         started        process3 file4 35 C:\Users\user\AppData\Local\...\auytkbuji.exe, PE32 11->35 dropped 14 auytkbuji.exe 11->14         started        process5 signatures6 67 Antivirus detection for dropped file 14->67 69 Machine Learning detection for dropped file 14->69 71 Found evasive API chain (may stop execution after reading information in the PEB, e.g. number of processors) 14->71 73 2 other signatures 14->73 17 auytkbuji.exe 14->17         started        process7 signatures8 43 Modifies the context of a thread in another process (thread injection) 17->43 45 Maps a DLL or memory area into another process 17->45 47 Sample uses process hollowing technique 17->47 49 Queues an APC in another process (thread injection) 17->49 20 explorer.exe 1 17->20 injected process9 dnsIp10 37 www.forty04.com 188.114.97.3, 49695, 80 CLOUDFLARENETUS European Union 20->37 39 www.naijabrain.africa 20->39 41 www.constantinopanama.com 20->41 59 System process connects to network (likely due to code injection or exploit) 20->59 24 WWAHost.exe 20->24         started        27 autofmt.exe 20->27         started        29 autofmt.exe 20->29         started        signatures11 process12 signatures13 61 Modifies the context of a thread in another process (thread injection) 24->61 63 Maps a DLL or memory area into another process 24->63 65 Tries to detect virtualization through RDTSC time measurements 24->65 31 cmd.exe 1 24->31         started        process14 process15 33 conhost.exe 31->33         started       
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/41ceb21d5f34451ddc166d2891c03c3af37ac0f2a055f5e274948b14c0f5a187/
Threat name:
Win32.Trojan.Leonem
Create hunting rule
Status:
Malicious
First seen:
2023-03-14 13:10:34 UTC
File Type:
PE (Exe)
Extracted files:
3
AV detection:
20 of 24 (83.33%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=ihhlehk7grcr3xawnuujdqb4hlzxvqhsubk7lytussfrjqhvugdq._file
Verdict:
malicious
Label(s):
formbook
Create hunting rule
Similar samples:
0bd096a462dd6ca8fd6563954bcb47167296672ce207e0a1b8b2407a796760a6
Formbook
142f8b22d894f1fee4c501acbc425edec276004d5d30ab7572cdfab85e89ad12
Formbook
1a28827929bbdf8fc02cbf542ae73de715c0b4b0e1be5c9484987ee44e652da1
Formbook
2d3c7fefde60268ec96906144d74058651f6d5d7ed5993a8b1ed00ca40a2d7f0
Formbook
34b13a0e4c1c0226e821fa78d0a32e797db1329f3ab0d16e41a413968c274ba7
Formbook
3af2c0904f3729e0408f6479f4222d5fbcf695f2b5cd32e8737e8690661bb18b
Formbook
73ebb7a09698155fa4a55057e36c5ffda58b30940670955cb7e2ecff5a348b15
Formbook
bedb5ef007caf41eb52f0331f1fdf5997271a828df7adb1e1132063129eba99e
Formbook
f863d6f9552aca996768b5d21f3a51ba32b0e918295102de475dd16562ec08c9
Formbook
+ 2'394 additional samples on MalwareBazaar
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook campaign:k04s rat spyware stealer trojan
Link:
https://tria.ge/reports/230314-qxyjdshe7t/
Behaviour
Gathers network information
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:
b98fda303c4f1b1c24919d5515b1ea66450aeaa67fded9cfa47b9d5b638c8f8f
MD5 hash:
33bf3d74194455b3e451c4a85a526f2a
SHA1 hash:
9e6938c3d9475aca196bee1be3141877d4c50f5e
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/69863359-460b-4014-96a6-683df7f20ea4/
Parent samples :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 hash:
5e9848939718dd6886d5e167bda39aec400de89e53b06a003df8881bdca4bf24
MD5 hash:
8c7e8408c958a4842f8007dffe91280f
SHA1 hash:
ecc463d0098647f5f0cc79e56339b8468bc70aec
Link:
https://www.unpac.me/results/69863359-460b-4014-96a6-683df7f20ea4/
SH256 hash:
41ceb21d5f34451ddc166d2891c03c3af37ac0f2a055f5e274948b14c0f5a187
MD5 hash:
325d14fe27a3b2a6cf35c604286b30a8
SHA1 hash:
de3b01aae8ce817d6d091ad6bd17f484c1832d4f
Link:
https://www.unpac.me/results/69863359-460b-4014-96a6-683df7f20ea4/
Malware family:
XLoader
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/41ceb21d5f34/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/41ceb21d5f34451ddc166d2891c03c3af37ac0f2a055f5e274948b14c0f5a187

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:meth_get_eip
Create hunting rule
Author:Willi Ballenthin
Rule name:meth_stackstrings
Create hunting rule
Author:Willi Ballenthin
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 41ceb21d5f34451ddc166d2891c03c3af37ac0f2a055f5e274948b14c0f5a187

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/374242/

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