MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 39c5b29df15e13a18cbc4b77a44208aa927af8851555a4d220d8af0be7aeb235. 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: 15


Intelligence 15 IOCs YARA 4 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 39c5b29df15e13a18cbc4b77a44208aa927af8851555a4d220d8af0be7aeb235
SHA3-384 hash: 48cda9bc8b038a7daaa5514bd7017490cca9ba9c2fd97dc40006e9fe2ef43aad6d74c16fafee65305336e41387baa573
SHA1 hash: 2a16ca50e68593db49450672e54ec8a977239a02
MD5 hash: 799febf0e89864960c7f98b546cea32c
humanhash: solar-fix-oklahoma-montana
File name:nAIj8iSBKtENT6y.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:420'864 bytes
First seen:2021-09-16 04:40:08 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'657 x AgentTesla, 19'468 x Formbook, 12'206 x SnakeKeylogger)
ssdeep 6144:8VbVe25GDwPtwcwZa/FbcGy5bL7jIP79cTe8ghjLswFf2TuOCnPq46iNeZFe:O07EPt7+mBcZZHjITae8ghSTxCn6iOe
Threatray 9'284 similar samples on MalwareBazaar
TLSH T1FB9412C7E24426ABC5AE46FCD093600883B2C6276243F3CDEE83D6E956C3FD11659697
Reporter GovCERT_CH
Tags:exe FormBook xloader

Intelligence

File Origin
# of uploads :
1
# of downloads :
272
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
nAIj8iSBKtENT6y.exe
Verdict:
Malicious activity
Analysis date:
2021-09-16 04:41:15 UTC
Tags:
trojan formbook stealer
Link:
https://app.any.run/tasks/61f693f6-c6e7-4569-a3d9-69fee5ae7289

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/188306/
Detection(s):
SecuriteInfo.com.MSIL.Kryptik.VFR-1.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Launching a process
Creating a file in the %temp% directory
Delayed writing of the file
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
packed
Link:
https://www.filescan.io/uploads/61751f06a9d585e6d537101d/reports/754ed097-e4a1-40fd-bf2e-19b64fa2f654/overview
Malware family:
Formbook
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/02d64e20-8f7d-412d-9a8a-46789d8577e3
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/851841
Signature
.NET source code contains potential unpacker
C2 URLs / IPs found in malware configuration
Found malware configuration
Injects a PE file into a foreign processes
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)
Multi AV Scanner detection for submitted file
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Sigma detected: Bad Opsec Defaults Sacrificial Processes With Improper Arguments
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 netstat to query active network connections and open ports
Writes to foreign memory regions
Yara detected AntiVM3
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 484272 Sample: nAIj8iSBKtENT6y.exe Startdate: 16/09/2021 Architecture: WINDOWS Score: 100 39 Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) 2->39 41 Found malware configuration 2->41 43 Malicious sample detected (through community Yara rule) 2->43 45 7 other signatures 2->45 10 nAIj8iSBKtENT6y.exe 3 2->10         started        process3 file4 29 C:\Users\user\...\nAIj8iSBKtENT6y.exe.log, ASCII 10->29 dropped 57 Writes to foreign memory regions 10->57 59 Injects a PE file into a foreign processes 10->59 14 RegSvcs.exe 10->14         started        signatures5 process6 signatures7 61 Modifies the context of a thread in another process (thread injection) 14->61 63 Maps a DLL or memory area into another process 14->63 65 Sample uses process hollowing technique 14->65 67 2 other signatures 14->67 17 explorer.exe 14->17 injected process8 dnsIp9 31 zcbrktc158kijhtx.phlotplay.com 154.204.48.217, 80 SONDERCLOUDLIMITED-AS-APSonderCloudLimitedHK Seychelles 17->31 33 www.438451.com 160.202.170.147, 49820, 80 SKHT-ASShenzhenKatherineHengTechnologyInformationCo China 17->33 35 11 other IPs or domains 17->35 47 System process connects to network (likely due to code injection or exploit) 17->47 49 Uses netstat to query active network connections and open ports 17->49 21 NETSTAT.EXE 12 17->21         started        signatures10 process11 dnsIp12 37 www.changcheng.pro 21->37 51 Modifies the context of a thread in another process (thread injection) 21->51 53 Maps a DLL or memory area into another process 21->53 55 Tries to detect virtualization through RDTSC time measurements 21->55 25 cmd.exe 1 21->25         started        signatures13 process14 process15 27 conhost.exe 25->27         started       
Detection:
formbook
Create hunting rule
Link:
https://mwdb.cert.pl/sample/39c5b29df15e13a18cbc4b77a44208aa927af8851555a4d220d8af0be7aeb235/
Threat name:
ByteCode-MSIL.Trojan.AgentTesla
Create hunting rule
Status:
Malicious
First seen:
2021-09-16 03:54:34 UTC
AV detection:
23 of 28 (82.14%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=hhc3fhprlyj2ddf4jn32iqqivkjhv6efcvk2jura3cxqxz5owi2q._file
Verdict:
malicious
Label(s):
formbook
Create hunting rule
Similar samples:
3f383c683795d277510e0fb4c806ae17bfb33dd6ff875b66c159068e58c28818
Formbook
4611b180e4173882dba3e08aaa44ae28ce14d2f2709b2017082d57bcdecfb352
Formbook
4b9ec9143ae2471c8cf540f5e3815c4ca4bb5e073d5c45e6bd934cc0350e8546
Formbook
7deecd8502e99ced6aec8588840f7e972a3b030c19e0e88ef94ec3a9d2ababc9
Formbook
abb1db77386f0eb3cd2c68603ee8817d6d1015287422182845345dad70503564
Formbook
bb60b98852cad89fe450ec8486cee96bb6932b29c692f97d5b7ed7936556845f
Formbook
bb7d986712c63235f866f11ebc85ac60c360676e0576a075f16c16f679c31c7b
Formbook
cfdb27a9ff39bd1aa5a0a43fe6e272c269a311f5748d8a13b2e705f7d66f16bd
Formbook
+ 9'274 additional samples on MalwareBazaar
Result
Malware family:
xloader
Create hunting rule
Score:
  10/10
Tags:
family:xloader campaign:t75f loader rat
Link:
https://tria.ge/reports/210916-fa43jscaa8/
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 UnmapMainImage
Suspicious use of WriteProcessMemory
Suspicious use of SetThreadContext
Xloader Payload
Xloader
Malware Config
C2 Extraction:
http://www.438451.com/t75f/
Unpacked files
SH256 hash:
137e7f2e6a7c09a78e52e3f6d1c5a7edc98b7da2cf696a76b3ae4229c2caa3d1
MD5 hash:
30dbc8cb36f5984331c8dfacab154e15
SHA1 hash:
6fd356a90ac8d7862738cede781486f9ce0ef26e
Detections:
win_formbook_g0
Create hunting rule
win_formbook_auto
Create hunting rule
Link:
https://www.unpac.me/results/b9dedecd-542e-4700-9d7e-3a2ad44bdea7/
Parent samples :
7deecd8502e99ced6aec8588840f7e972a3b030c19e0e88ef94ec3a9d2ababc9
7c3d5ebd2c417a52b2a0b98dee95b5a7f283816f6a2453ceeffd31becc140882
39c5b29df15e13a18cbc4b77a44208aa927af8851555a4d220d8af0be7aeb235
SH256 hash:
ad4a7895d529d5164302bb88596964ab42ff125bf0f5544418c80b6d438cb587
MD5 hash:
43ababb6b0a02907aad43084f12b10d9
SHA1 hash:
b60ba705891d5a666d64300181b475a46714ffa8
Link:
https://www.unpac.me/results/b9dedecd-542e-4700-9d7e-3a2ad44bdea7/
SH256 hash:
5c1f1dd6ede041a8867f455a788673475374d129c8b9660cd0c7c3a6995be154
MD5 hash:
8106f25d6d1c8a763db78c444826dc4c
SHA1 hash:
74cbbb85f683a0a4cbc371cefe16a0b6580d4a3b
Link:
https://www.unpac.me/results/b9dedecd-542e-4700-9d7e-3a2ad44bdea7/
SH256 hash:
39c5b29df15e13a18cbc4b77a44208aa927af8851555a4d220d8af0be7aeb235
MD5 hash:
799febf0e89864960c7f98b546cea32c
SHA1 hash:
2a16ca50e68593db49450672e54ec8a977239a02
Link:
https://www.unpac.me/results/b9dedecd-542e-4700-9d7e-3a2ad44bdea7/
Malware family:
FormBook
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/39c5b29df15e/report/overview.html
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
0.81
Link:
https://yomi.yoroi.company/submissions/39c5b29df15e13a18cbc4b77a44208aa927af8851555a4d220d8af0be7aeb235

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: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:pe_imphash
Create hunting rule
Rule name:Skystars_Malware_Imphash
Create hunting rule
Author:Skystars LightDefender
Description:imphash

File information

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

Malspam

Formbook

Executable exe 39c5b29df15e13a18cbc4b77a44208aa927af8851555a4d220d8af0be7aeb235

(this sample)

  
Dropped by
xloader
  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/188306/

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