MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 4a880e52c3e1d5d7857a6b81bd13e61e35c3111be7a5555a4f1fa5a7b5e938b0. 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 22 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 4a880e52c3e1d5d7857a6b81bd13e61e35c3111be7a5555a4f1fa5a7b5e938b0
SHA3-384 hash: 142a457b52de45135b9fd1fa0b2c52c134b3b15cd746cf02c9b24401481902565da389a08b30ec7f8fb09269799b1b9b
SHA1 hash: c8f08740fb914dc3cf376e42223f451eb11579a3
MD5 hash: 819e10834de4e6e0fe64f7d700edb5f0
humanhash: sad-fifteen-pluto-massachusetts
File name:6841059370.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:1'081'856 bytes
First seen:2025-09-15 09:10:16 UTC
Last seen:2025-10-10 06:36:51 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'657 x AgentTesla, 19'468 x Formbook, 12'206 x SnakeKeylogger)
ssdeep 24576:LmEvauzhOlkw/DeqU0h2XBG573HSVEJli5Ixv:qEVhwreP2jAUli5Ixv
TLSH T1663533220B88C493D6692B34BFCCF71255F3A35544BA58D5414BD8BF8FA612C0D7BAB2
TrID 71.1% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13)
10.2% (.EXE) Win64 Executable (generic) (10522/11/4)
6.3% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
4.3% (.EXE) Win32 Executable (generic) (4504/4/1)
2.0% (.ICL) Windows Icons Library (generic) (2059/9)
Magika pebin
Reporter lowmal3
Tags:exe FormBook

Intelligence

File Origin
# of uploads :
2
# of downloads :
119
Origin country :
DE DE
Vendor Threat Intelligence
Malware family:
formbook
Create hunting rule
ID:
1
File name:
6841059370.exe
Verdict:
Malicious activity
Analysis date:
2025-09-15 09:25:00 UTC
Tags:
auto-startup netreactor purecrypter stealer formbook xloader
Link:
https://app.any.run/tasks/d070518a-b860-47d2-a332-f7dfb223755d

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/27519/
Verdict:
Clean
Score:
99.9%
Link:
https://cyber-fortress.com/docs/result/index.php?id=68c7d818e579c633a4b55891
Tags:
n/a
Result
Verdict:
Clean
Maliciousness:

Behaviour
Creating a file
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
obfuscated packed packed packer_detected
Link:
https://www.filescan.io/uploads/68c7d97073287948292a422a/reports/8a5e1fd6-eedf-4dfe-b18c-845d788db426/overview
Verdict:
Malicious
Labled as:
MSIL.Androm.Generic
Link:
https://www.hybrid-analysis.com/sample/4a880e52c3e1d5d7857a6b81bd13e61e35c3111be7a5555a4f1fa5a7b5e938b0
Verdict:
Malicious
File Type:
exe x32
First seen:
2025-09-14T22:42:00Z UTC
Last seen:
2025-09-14T22:42:00Z UTC
Hits:
~100
Link:
https://opentip.kaspersky.com/4a880e52c3e1d5d7857a6b81bd13e61e35c3111be7a5555a4f1fa5a7b5e938b0/results?tab=lookup
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/bd068eec-e610-4c93-9811-0a950c985761
Result
Threat name:
FormBook, PureLog Stealer, ResolverRAT
Create hunting rule
Detection:
malicious
Classification:
rans.troj.spyw.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1777624
Signature
.NET source code contains method to dynamically call methods (often used by packers)
.NET source code contains potential unpacker
Antivirus / Scanner detection for submitted sample
Antivirus detection for dropped file
Antivirus detection for URL or domain
Drops VBS files to the startup folder
Injects a PE file into a foreign processes
Joe Sandbox ML detected suspicious sample
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 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)
Sigma detected: Drops script at startup location
Sigma detected: WScript or CScript Dropper
Suricata IDS alerts for network traffic
Switches to a custom stack to bypass stack traces
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Mail credentials (via file / registry access)
Uses shutdown.exe to shutdown or reboot the system
Windows Scripting host queries suspicious COM object (likely to drop second stage)
Writes to foreign memory regions
Yara detected AntiVM3
Yara detected Costura Assembly Loader
Yara detected FormBook
Yara detected PureLog Stealer
Yara detected ResolverRAT
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1777624 Sample: 6841059370.exe Startdate: 15/09/2025 Architecture: WINDOWS Score: 100 44 www.specialultra.xyz 2->44 46 www.regulatorydata.xyz 2->46 48 15 other IPs or domains 2->48 66 Suricata IDS alerts for network traffic 2->66 68 Antivirus detection for URL or domain 2->68 70 Antivirus / Scanner detection for submitted sample 2->70 74 12 other signatures 2->74 11 6841059370.exe 5 2->11         started        15 wscript.exe 1 2->15         started        signatures3 72 Performs DNS queries to domains with low reputation 46->72 process4 file5 38 C:\Users\user\...\IdentityReference.exe, PE32 11->38 dropped 40 C:\Users\user\...\IdentityReference.vbs, ASCII 11->40 dropped 42 C:\...\IdentityReference.exe:Zone.Identifier, ASCII 11->42 dropped 84 Drops VBS files to the startup folder 11->84 86 Tries to detect sandboxes and other dynamic analysis tools (process name or module or function) 11->86 88 Writes to foreign memory regions 11->88 90 Injects a PE file into a foreign processes 11->90 17 InstallUtil.exe 11->17         started        92 Windows Scripting host queries suspicious COM object (likely to drop second stage) 15->92 20 IdentityReference.exe 2 15->20         started        signatures6 process7 signatures8 56 Maps a DLL or memory area into another process 17->56 22 YOYM97OSea.exe 17->22 injected 58 Antivirus detection for dropped file 20->58 60 Multi AV Scanner detection for dropped file 20->60 62 Writes to foreign memory regions 20->62 64 Injects a PE file into a foreign processes 20->64 24 InstallUtil.exe 20->24         started        process9 process10 26 shutdown.exe 13 22->26         started        signatures11 76 Tries to steal Mail credentials (via file / registry access) 26->76 78 Tries to harvest and steal browser information (history, passwords, etc) 26->78 80 Modifies the context of a thread in another process (thread injection) 26->80 82 3 other signatures 26->82 29 MdJ7YuqmMIhMAv.exe 26->29 injected 32 chrome.exe 26->32         started        34 firefox.exe 26->34         started        process12 dnsIp13 50 www.bronel.top 203.161.48.133, 49713, 49714, 49715 VNPT-AS-VNVNPTCorpVN Malaysia 29->50 52 8m1.xyz 173.0.157.187, 49709, 49710, 49711 SERVERS-COMUS United States 29->52 54 7 other IPs or domains 29->54 36 WerFault.exe 4 32->36         started        process14
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/4a880e52c3e1d5d7857a6b81bd13e61e35c3111be7a5555a4f1fa5a7b5e938b0
Verdict:
inconclusive
YARA:
10 match(es)
Tags:
.Net Executable Managed .NET PE (Portable Executable) PE File Layout SOS: 0.61 Win 32 Exe x86
Link:
https://app.malva.re/file/819e10834de4e6e0fe64f7d700edb5f0
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/4a880e52c3e1d5d7857a6b81bd13e61e35c3111be7a5555a4f1fa5a7b5e938b0/
Threat name:
Win32.Trojan.Kepavll
Create hunting rule
Status:
Malicious
First seen:
2025-09-15 04:22:29 UTC
File Type:
PE (.Net Exe)
Extracted files:
3
AV detection:
29 of 38 (76.32%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=jkea4uwd4hk5pbl2noa32e7gdy24gei346svkwspd6s2pnpjhcya._file
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook discovery rat spyware stealer trojan
Link:
https://tria.ge/reports/250915-k722nsxzcw/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Program crash
System Location Discovery: System Language Discovery
Suspicious use of SetThreadContext
Drops startup file
Formbook payload
Formbook
Formbook family
Verdict:
Suspicious
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/fd82604c-c275-4980-8b2b-46a2d54a9cd2
Unpacked files
SH256 hash:
4a880e52c3e1d5d7857a6b81bd13e61e35c3111be7a5555a4f1fa5a7b5e938b0
MD5 hash:
819e10834de4e6e0fe64f7d700edb5f0
SHA1 hash:
c8f08740fb914dc3cf376e42223f451eb11579a3
Link:
https://www.unpac.me/results/22d66b8b-cbcd-4855-972e-beadf6b3035f/
SH256 hash:
2c6277055d33a2c83c3d8558c3d0e7dd3295b9af95fe4b7b7b72b6b94ae2a8fa
MD5 hash:
bd41e22368e3d71e5252cc37b9ae3ee3
SHA1 hash:
33e198cecad6245bbfe0af42519877e3d04e89c3
Detections:
SUSP_OBF_NET_Reactor_Indicators_Jan24
Create hunting rule
Link:
https://www.unpac.me/results/22d66b8b-cbcd-4855-972e-beadf6b3035f/
SH256 hash:
19efdf03cb94895935225795f68bb9abfded1869687367013b8b4eee3cc99372
MD5 hash:
4e29f75c0c51b9dec76955f0382d9541
SHA1 hash:
4899aa8e3f57339cbaec8faab777897a76fe1c3a
Link:
https://www.unpac.me/results/22d66b8b-cbcd-4855-972e-beadf6b3035f/
SH256 hash:
4ea32fb8c54de2e1b1b00a5130798d5f3378b79f679d7afc3c92c4d46e872615
MD5 hash:
5a027778f1e847b0106827904a7069d2
SHA1 hash:
7c240cb31c9878dbee0b66df58f6046abbd8d473
Link:
https://www.unpac.me/results/22d66b8b-cbcd-4855-972e-beadf6b3035f/
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/4a880e52c3e1d5d7857a6b81bd13e61e35c3111be7a5555a4f1fa5a7b5e938b0

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:CP_AllMal_Detector
Create hunting rule
Author:DiegoAnalytics
Description:CrossPlatform All Malwares Detector: Detect PE, ELF, Mach-O, scripts, archives; overlay, obfuscation, encryption, spoofing, hiding, high entropy, network communication
Rule name:CP_Script_Inject_Detector
Create hunting rule
Author:DiegoAnalytics
Description:Detects attempts to inject code into another process across PE, ELF, Mach-O binaries
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:DetectEncryptedVariants
Create hunting rule
Author:Zinyth
Description:Detects 'encrypted' in ASCII, Unicode, base64, or hex-encoded
Rule name:dgaagas
Create hunting rule
Author:Harshit
Description:Uses certutil.exe to download a file named test.txt
Rule name:golang_bin_JCorn_CSC846
Create hunting rule
Author:Justin Cornwell
Description:CSC-846 Golang detection ruleset
Rule name:MD5_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for MD5 constants
Rule name:NET
Create hunting rule
Author:malware-lu
Rule name:NETexecutableMicrosoft
Create hunting rule
Author:malware-lu
Rule name:pe_imphash
Create hunting rule
Rule name:pe_no_import_table
Create hunting rule
Description:Detect pe file that no import table
Rule name:RANSOMWARE
Create hunting rule
Author:ToroGuitar
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:Skystars_Malware_Imphash
Create hunting rule
Author:Skystars LightDefender
Description:imphash
Rule name:Sus_CMD_Powershell_Usage
Create hunting rule
Author:XiAnzheng
Description:May Contain(Obfuscated or no) Powershell or CMD Command that can be abused by threat actor(can create FP)
Rule name:Sus_Obf_Enc_Spoof_Hide_PE
Create hunting rule
Author:XiAnzheng
Description:Check for Overlay, Obfuscating, Encrypting, Spoofing, Hiding, or Entropy Technique(can create FP)

File information

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

Malspam

Formbook

Executable exe 4a880e52c3e1d5d7857a6b81bd13e61e35c3111be7a5555a4f1fa5a7b5e938b0

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/27519/

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