MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 ef028b54c9db1e219945dc197b728fa1d486357029e065c6f635b6fff660da3f. 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: 12


Intelligence 12 IOCs YARA 6 File information Comments
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SHA256 hash: ef028b54c9db1e219945dc197b728fa1d486357029e065c6f635b6fff660da3f
SHA3-384 hash: 6964c2505f63e1aec300481c492fec113fc9979953bbf9352bd165befe6da021da55290aa87b441ee8df72f3482ecb67
SHA1 hash: a131daf626cf9c9a3417629c3e68e91d95edbb9a
MD5 hash: 429f6a8c21ff3e2c1fc6b6711b85a4ef
humanhash: carbon-emma-louisiana-wolfram
File name:Taskmgr.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:28'088 bytes
First seen:2021-11-28 22:17:03 UTC
Last seen:2021-11-28 23:34:14 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'742 x AgentTesla, 19'606 x Formbook, 12'242 x SnakeKeylogger)
ssdeep 384:X/WN1xrHSDBHSpSQSaS3SrOrOxspLX9rSVTo71tkzDM9cXd4qjHvJoTBeh5NX:OoDdWSQSaS3SyAZw1tgS2DvJoTBehH
Threatray 11'923 similar samples on MalwareBazaar
TLSH T1BDC209607659063ACF7A4E33F492C112F33C5356F81FDB4D38AA59198DD33422A562AF
Reporter GovCERT_CH
Tags:exe FormBook signed

Code Signing Certificate

Organisation:0RU8aK7746dbe82
Issuer:0RU8aK7746dbe82
Algorithm:sha256WithRSAEncryption
Valid from:2021-11-02T21:50:41Z
Valid to:2022-11-02T21:50:41Z
Serial number: 2d15494d4fbb8bd1501fe6a23cdb6a39
Thumbprint Algorithm:SHA256
Thumbprint: f73974203ba916df16e39e72fe2d421468069d625f17a2e1f90a383ec2dcbe2f
Source:This information was brought to you by ReversingLabs A1000 Malware Analysis Platform

Intelligence

File Origin
# of uploads :
2
# of downloads :
135
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
Taskmgr.exe
Verdict:
Malicious activity
Analysis date:
2021-11-28 22:17:51 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/843a471c-dcb6-4db9-a492-4865b43b72c6

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection(s):
SecuriteInfo.com.Trojan.Siggen15.36988.15813.30115.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Сreating synchronization primitives
DNS request
Sending a custom TCP request
Creating a file in the %temp% subdirectories
Creating a process from a recently created file
Creating a process with a hidden window
Launching a service
Launching a process
Adding an access-denied ACE
Changing a file
Searching for synchronization primitives
Launching the default Windows debugger (dwwin.exe)
Launching cmd.exe command interpreter
Searching for the window
Using the Windows Management Instrumentation requests
Sending an HTTP GET request
Blocking the User Account Control
Forced shutdown of a system process
Adding exclusions to Windows Defender
Unauthorized injection to a system process
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
80%
Tags:
overlay packed packed
Link:
https://www.filescan.io/uploads/61a4001beffcae2254f3d3f0/reports/e4f7fa32-b61b-4d14-b41d-101c4d8b2c77/overview
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:
SpamSoldier
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Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/a407efdc-a85b-4f91-98bb-fe69ab6af53b
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/897549
Signature
Adds a directory exclusion to Windows Defender
C2 URLs / IPs found in malware configuration
Disables UAC (registry)
Found malware configuration
Hides threads from debuggers
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: Powershell Defender Exclusion
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 AntiVM3
Yara detected FormBook
Yara detected UAC Bypass using CMSTP
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 530027 Sample: Taskmgr.exe Startdate: 28/11/2021 Architecture: WINDOWS Score: 100 48 www.stanfordgrouploscabos.com 2->48 50 www.ardoratrading.com 2->50 52 stanfordgrouploscabos.com 2->52 72 Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) 2->72 74 Found malware configuration 2->74 76 Malicious sample detected (through community Yara rule) 2->76 78 7 other signatures 2->78 11 Taskmgr.exe 21 6 2->11         started        signatures3 process4 dnsIp5 56 cdn.discordapp.com 162.159.130.233, 443, 49743, 49744 CLOUDFLARENETUS United States 11->56 46 C:\Users\user\AppData\...\AdvancedRun.exe, PE32 11->46 dropped 88 Adds a directory exclusion to Windows Defender 11->88 90 Disables UAC (registry) 11->90 92 Hides threads from debuggers 11->92 16 aspnet_wp.exe 11->16         started        19 WerFault.exe 11->19         started        22 AdvancedRun.exe 1 11->22         started        25 3 other processes 11->25 file6 signatures7 process8 dnsIp9 64 Modifies the context of a thread in another process (thread injection) 16->64 66 Maps a DLL or memory area into another process 16->66 68 Sample uses process hollowing technique 16->68 70 2 other signatures 16->70 27 explorer.exe 16->27 injected 44 C:\ProgramData\Microsoft\...\Report.wer, Little-endian 19->44 dropped 54 192.168.2.1 unknown unknown 22->54 31 AdvancedRun.exe 22->31         started        33 conhost.exe 25->33         started        35 conhost.exe 25->35         started        file10 signatures11 process12 dnsIp13 58 www.roadsidefarmer.com 74.220.199.6, 49817, 80 UNIFIEDLAYER-AS-1US United States 27->58 60 www.7starcollection.com 198.54.117.244, 49818, 80 NAMECHEAP-NETUS United States 27->60 62 9 other IPs or domains 27->62 86 System process connects to network (likely due to code injection or exploit) 27->86 37 cscript.exe 27->37         started        signatures14 process15 signatures16 80 Modifies the context of a thread in another process (thread injection) 37->80 82 Maps a DLL or memory area into another process 37->82 84 Tries to detect virtualization through RDTSC time measurements 37->84 40 cmd.exe 37->40         started        process17 process18 42 conhost.exe 40->42         started       
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/ef028b54c9db1e219945dc197b728fa1d486357029e065c6f635b6fff660da3f/
Threat name:
ByteCode-MSIL.Trojan.AgentTesla
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Status:
Malicious
First seen:
2021-11-06 11:11:08 UTC
File Type:
PE (.Net Exe)
Extracted files:
4
AV detection:
29 of 45 (64.44%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=54biwvgj3mpcdgkf3qmxw4upuhkimnlqfhqglrxwgw3p75ta3i7q._file
Verdict:
malicious
Label(s):
formbook
Create hunting rule
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Formbook
4217bf1cf710804c6b4a7b6a7d03974aaa655e512e3bf854c193feb7b2a8d422
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dfb938333b6dbb62861831b5641728e8bfa444d4b820df6fb6dbce56f83ab42f
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e862c2495e79b33c27fd00a29dda3c22df6796ff8aa7fc6294216a46668f9047
Formbook
+ 11'913 additional samples on MalwareBazaar
Result
Malware family:
xloader
Create hunting rule
Score:
  10/10
Tags:
family:xloader campaign:a6hg evasion loader rat trojan
Link:
https://tria.ge/reports/211128-17cpsadgc3/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
System policy modification
Enumerates physical storage devices
Program crash
Drops file in Windows directory
Suspicious use of NtSetInformationThreadHideFromDebugger
Suspicious use of SetThreadContext
Checks whether UAC is enabled
Loads dropped DLL
Windows security modification
Executes dropped EXE
Nirsoft
Xloader Payload
Modifies Windows Defender Real-time Protection settings
Turns off Windows Defender SpyNet reporting
UAC bypass
Windows security bypass
Xloader
Malware Config
C2 Extraction:
http://www.7starcollection.com/a6hg/
Unpacked files
SH256 hash:
ef028b54c9db1e219945dc197b728fa1d486357029e065c6f635b6fff660da3f
MD5 hash:
429f6a8c21ff3e2c1fc6b6711b85a4ef
SHA1 hash:
a131daf626cf9c9a3417629c3e68e91d95edbb9a
Link:
https://www.unpac.me/results/b107eda1-d6e1-41be-9343-5c458abed742/
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Formbook
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/ef028b54c9db1e219945dc197b728fa1d486357029e065c6f635b6fff660da3f

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_EXE_DiscordURL
Create hunting rule
Author:ditekSHen
Description:Detects executables Discord URL observed in first stage droppers
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
Rule name:SUSP_PE_Discord_Attachment_Oct21_1
Create hunting rule
Author:Florian Roth
Description:Detects suspicious executable with reference to a Discord attachment (often used for malware hosting on a legitimate FQDN)
Reference:Internal Research

File information

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

Malspam

Formbook

Executable exe ef028b54c9db1e219945dc197b728fa1d486357029e065c6f635b6fff660da3f

(this sample)

  
Dropped by
formbook
  
Delivery method
Distributed via e-mail attachment

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