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MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 4a9a4282a7c02191cfdcc480e7af5fc5619be8902cae717cda731dd32cf493c5. 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: 16


Intelligence 16 IOCs YARA 4 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 4a9a4282a7c02191cfdcc480e7af5fc5619be8902cae717cda731dd32cf493c5
SHA3-384 hash: af9398a00ba2fe79d9329cdb36512d8a73fa7163a6b1d8465d0a2a0a7b810213c9de69fcd1c04313506b2da662353ddb
SHA1 hash: 4276e56ce6490f8ef5d8834f7f6c7fafb33ca6c8
MD5 hash: ee4eb2afd293e11b358929d2ffc5a311
humanhash: sink-maryland-august-utah
File name:file
Download: download sample
Signature Formbook
Create hunting rule
File size:1'315'840 bytes
First seen:2026-09-16 06:24:48 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (49'245 x AgentTesla, 20'499 x Formbook, 12'374 x SnakeKeylogger)
ssdeep 24576:FsVi1hhj5lkf7v7kn/OtVQrmhS+tU6WDS7WnyjOZxW5GxPSZ:4mh7Gfrms+rmQ+66k7yKHgGxPS
TLSH T1FA55F1959316C807C6901AB4C9B1FBB512786FF8E807C353FAE67DEBB9283463845253
TrID 70.4% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13)
6.3% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
6.2% (.EXE) Win64 Executable (generic) (6522/11/2)
4.8% (.EXE) Win16 NE executable (generic) (5038/12/1)
4.3% (.EXE) Win32 Executable (generic) (4504/4/1)
Magika pebin
dhash icon 30e0cc8898c4e030 (2 x PureLogsStealer, 1 x Formbook, 1 x MassLogger)
Reporter Bitsight
Tags:dropped-by-remcos exe FormBook Remotehost

Intelligence

File Origin
# of uploads :
1
# of downloads :
186
Origin country :
US US
Vendor Threat Intelligence
Malware configuration found for:
NETReactor RoboSki
Details
Link:
https://research.acce.ciphertechsolutions.com/results/a4c55286-692e-4e7b-8ac7-4c826b957384/
Malware family:
guloader
Create hunting rule
ID:
1
File name:
exe
Verdict:
Malicious activity
Analysis date:
2026-09-16 06:32:42 UTC
Tags:
netreactor auto-reg guloader loader
Link:
https://app.any.run/tasks/cff1b641-7498-477c-b0f9-df7b59786a65

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/85816/
Detection(s):
SecuriteInfo.com.Win32.MalwareX-gen.48927166.UNOFFICIAL
Create hunting rule

Verdict:
Likely Malicious
Threat level:
  7.5/10
Confidence:
100%
Tags:
net_reactor obfuscated packed packed vbnet
Link:
https://www.filescan.io/uploads/6aaa364626dfe6c49e159755/reports/96a07d4b-3e64-4f3a-92a4-506c0469b8ba/overview
Verdict:
Malicious
Labled as:
Win/malicious_confidence_100%
Link:
https://www.hybrid-analysis.com/sample/4a9a4282a7c02191cfdcc480e7af5fc5619be8902cae717cda731dd32cf493c5
Verdict:
Malicious
File Type:
exe x32
First seen:
2026-09-16T04:19:00Z UTC
Last seen:
2026-09-17T02:38:00Z UTC
Hits:
~100
Link:
https://opentip.kaspersky.com/4a9a4282a7c02191cfdcc480e7af5fc5619be8902cae717cda731dd32cf493c5/results?tab=lookup
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/3a3ef536-9863-49e5-8923-cb650890c73f
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/4a9a4282a7c02191cfdcc480e7af5fc5619be8902cae717cda731dd32cf493c5
Verdict:
Malware
YARA:
12 match(es)
Tags:
.Net .Net Obfuscator .Net Reactor Executable Managed .NET PE (Portable Executable) PE File Layout SOS: 0.69 Win 32 Exe x86
Link:
https://app.malva.re/file/ee4eb2afd293e11b358929d2ffc5a311
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/4a9a4282a7c02191cfdcc480e7af5fc5619be8902cae717cda731dd32cf493c5/
Threat name:
Win32.Trojan.AgentTesla
Create hunting rule
Status:
Suspicious
First seen:
2026-09-16 06:25:30 UTC
File Type:
PE (.Net Exe)
Extracted files:
16
AV detection:
23 of 38 (60.53%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=jknefavhyaqzdt64ysaopl27yvqzx2eqfsxhc7g2omo5glhuspcq._file
Verdict:
malicious
Label(s):
Formbook
Create hunting rule
Link:
https://reports.threatray.com/6ef4b8db-ebcd-4409-a9a8-c1a9a115f322
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook adware collection discovery execution persistence rat spyware stealer trojan
Link:
https://tria.ge/reports/260916-g6pheagj5x/
Behaviour
Modifies Internet Explorer settings
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of UnmapMainImage
Suspicious use of WriteProcessMemory
outlook_office_path
Enumerates physical storage devices
System Location Discovery: System Language Discovery
Suspicious use of SetThreadContext
Accesses Microsoft Outlook profiles
Adds Run key to start application
Checks computer location settings
Executes dropped EXE
Command and Scripting Interpreter: PowerShell
Family: Formbook
Formbook payload
Unpacked files
SH256 hash:
4a9a4282a7c02191cfdcc480e7af5fc5619be8902cae717cda731dd32cf493c5
MD5 hash:
ee4eb2afd293e11b358929d2ffc5a311
SHA1 hash:
4276e56ce6490f8ef5d8834f7f6c7fafb33ca6c8
Link:
https://www.unpac.me/results/e683df97-b603-4687-8efd-b3befd9033f2/
SH256 hash:
fa88ea87e2670b073b3047c5c6d9cd13adcd477af1e20331bf27431dbb6c83cc
MD5 hash:
dbd3f2e6c005e29fe57bb6a2afc646bd
SHA1 hash:
1fd3bd06a68470e17da25c08714fcba370323296
Detections:
SUSP_OBF_NET_ConfuserEx_Name_Pattern_Jan24
Create hunting rule
Link:
https://www.unpac.me/results/e683df97-b603-4687-8efd-b3befd9033f2/
SH256 hash:
c4ff80fbb1b2133b1f76bb68d29f776437a5b168ab12da8876aa25f16888a391
MD5 hash:
2df86e0c3383c2a1ba077bd3eac73794
SHA1 hash:
f4b103d7cd6d89ec06da3770e66382f1cd854402
Detections:
SUSP_OBF_NET_Reactor_Indicators_Jan24
Create hunting rule
Link:
https://www.unpac.me/results/e683df97-b603-4687-8efd-b3befd9033f2/
Parent samples :
4a9a4282a7c02191cfdcc480e7af5fc5619be8902cae717cda731dd32cf493c5
1d75132e5ab94b7c75d14101f440af68e9fd46ff81286b280955f5e462148417
3f29b402fc1126ee40b8c2e7058f67a49fd3518d3d2e43b7dabf5da4e9f89589
b26c37434671d62ad1e1396db886d0419bf778d4ca5b3b54cf46319c40c277e0
c4e4375701cb85ee71bf3182cdabd6ab27ef71c9cc635469f76c85da29f4e102
767acae341ce8777302e61e0a7516bf4a2db5a34c2a733b5cd4a51b5f6d20ae5
e5530ac3388f55153f5ae4ebf01abdfbcb1a2e76ffac7e8ca1ebbcac3364fb3a
SH256 hash:
3363685d0637e615136c9fc2ca71eae2c09f200daafd6847381f356da12a2a0a
MD5 hash:
b811b056522f0943076bd8082b4c7b9c
SHA1 hash:
7c6de8afe303bae16ec70229b2449931919e8dcc
Link:
https://www.unpac.me/results/e683df97-b603-4687-8efd-b3befd9033f2/
Malware family:
FormBook
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/4a9a4282a7c0/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/4a9a4282a7c02191cfdcc480e7af5fc5619be8902cae717cda731dd32cf493c5

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:NET
Create hunting rule
Author:malware-lu
Rule name:pe_imphash
Create hunting rule
Rule name:Skystars_Malware_Imphash
Create hunting rule
Author:Skystars LightDefender
Description:imphash
Rule name:VECT_Ransomware
Create hunting rule
Author:Mustafa Bakhit
Description:Detects activity associated with VECT ransomware. This includes registry modifications and deletions, execution of system and defense-evasion commands, suspicious API usage, mutex creation, file and memory manipulation, ransomware note generation, anti-debugging and anti-analysis techniques, and embedded cryptographic constants (SHA256) characteristic of this malware family. Designed for threat intelligence and malware detection environments.

File information

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

Web download

Formbook

Executable exe 4a9a4282a7c02191cfdcc480e7af5fc5619be8902cae717cda731dd32cf493c5

(this sample)

  
Dropped by
Remcos
  
Delivery method
Distributed via web download
Cape
Cape
https://www.capesandbox.com/analysis/85816/

Comments