MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 13d5f928a4a2b54818e4ac7e8a629e50536462929d5a338415a3618794120d11. 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: 14


Intelligence 14 IOCs YARA 15 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 13d5f928a4a2b54818e4ac7e8a629e50536462929d5a338415a3618794120d11
SHA3-384 hash: e31c6844a585276deca7d93dd88b1ab49f70bc835b0f6c1f4aafc0e6f97f7b5a92b3f77dbde1fd075554647e120f2ad9
SHA1 hash: 5860cdcffa9473711c9af8505a6aad1ba262af64
MD5 hash: ed387f51ff79d3a3a30571447d8680b5
humanhash: vermont-arizona-quiet-skylark
File name:13d5f928a4a2b54818e4ac7e8a629e50536462929d5a338415a3618794120d11
Download: download sample
Signature Formbook
Create hunting rule
File size:620'544 bytes
First seen:2025-06-10 11:19:00 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'666 x AgentTesla, 19'479 x Formbook, 12'209 x SnakeKeylogger)
ssdeep 12288:XgDB6yJN/JsrAS/lIRpKucdv91dkkJ63FDh+fcw5hcBYgSX0iqIdErD:XWq0S9IRdIv91dv4F9GWWBtE
Threatray 4'588 similar samples on MalwareBazaar
TLSH T1E6D4021A2266CE03CC662BB95221D2B86775AFCFE532D34A8FDD5DC7BA17B200644353
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
dhash icon 8271f0d4d4e87192 (10 x Formbook, 9 x SnakeKeylogger, 9 x MassLogger)
Reporter adrian__luca
Tags:exe FormBook

Intelligence

File Origin
# of uploads :
1
# of downloads :
373
Origin country :
HU HU
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
13d5f928a4a2b54818e4ac7e8a629e50536462929d5a338415a3618794120d11
Verdict:
No threats detected
Analysis date:
2025-06-10 18:17:57 UTC
Tags:
netreactor
Link:
https://app.any.run/tasks/f6cedb1c-980a-4943-ac0a-9ebe86771e01

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/8747/
Verdict:
Malicious
Score:
99.1%
Link:
https://cyber-fortress.com/docs/result/index.php?id=684814c107b5e8c1cfe61668
Tags:
agenttesla virus micro msil
Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
Creating a window
Unauthorized injection to a recently created process
Restart of the analyzed sample
Creating a file
Verdict:
Malicious
Labled as:
Win/malicious_confidence_100%
Link:
https://www.hybrid-analysis.com/sample/13d5f928a4a2b54818e4ac7e8a629e50536462929d5a338415a3618794120d11
Malware family:
Formbook
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/5b5d4307-1830-400a-9d53-ecdf9b9c7de0
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1711047
Signature
.NET source code contains potential unpacker
C2 URLs / IPs found in malware configuration
Changes security center settings (notifications, updates, antivirus, firewall)
Found direct / indirect Syscall (likely to bypass EDR)
Found malware configuration
Injects a PE file into a foreign processes
Joe Sandbox ML detected suspicious 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 submitted file
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Switches to a custom stack to bypass stack traces
Tries to detect virtualization through RDTSC time measurements
Uses threadpools to delay analysis
Yara detected AntiVM3
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1711047 Sample: eyDv8vgzRN.exe Startdate: 10/06/2025 Architecture: WINDOWS Score: 100 40 www.xa95w.top 2->40 42 www.obinrezwan.live 2->42 44 3 other IPs or domains 2->44 48 Found malware configuration 2->48 50 Malicious sample detected (through community Yara rule) 2->50 52 Multi AV Scanner detection for submitted file 2->52 54 6 other signatures 2->54 11 eyDv8vgzRN.exe 3 2->11         started        signatures3 process4 file5 38 C:\Users\user\AppData\...\eyDv8vgzRN.exe.log, ASCII 11->38 dropped 56 Tries to detect virtualization through RDTSC time measurements 11->56 58 Injects a PE file into a foreign processes 11->58 60 Uses threadpools to delay analysis 11->60 62 Switches to a custom stack to bypass stack traces 11->62 15 eyDv8vgzRN.exe 11->15         started        18 svchost.exe 11->18         started        20 eyDv8vgzRN.exe 11->20         started        22 eyDv8vgzRN.exe 11->22         started        signatures6 process7 signatures8 72 Modifies the context of a thread in another process (thread injection) 15->72 74 Maps a DLL or memory area into another process 15->74 76 Sample uses process hollowing technique 15->76 80 2 other signatures 15->80 24 explorer.exe 44 7 15->24 injected 78 Changes security center settings (notifications, updates, antivirus, firewall) 18->78 27 MpCmdRun.exe 2 18->27         started        process9 dnsIp10 46 204.79.197.203, 443, 80 MICROSOFT-CORP-MSN-AS-BLOCKUS United States 24->46 29 mstsc.exe 24->29         started        32 conhost.exe 27->32         started        process11 signatures12 64 Modifies the context of a thread in another process (thread injection) 29->64 66 Maps a DLL or memory area into another process 29->66 68 Tries to detect virtualization through RDTSC time measurements 29->68 70 Switches to a custom stack to bypass stack traces 29->70 34 cmd.exe 1 29->34         started        process13 process14 36 conhost.exe 34->36         started       
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/13d5f928a4a2b54818e4ac7e8a629e50536462929d5a338415a3618794120d11
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/13d5f928a4a2b54818e4ac7e8a629e50536462929d5a338415a3618794120d11/
Threat name:
ByteCode-MSIL.Trojan.AgentTesla
Create hunting rule
Status:
Malicious
First seen:
2025-05-29 13:32:52 UTC
File Type:
PE (.Net Exe)
Extracted files:
8
AV detection:
27 of 36 (75.00%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=cpk7skfeuk2uqghevr7iuyu6kbjwiyustvndhbavunqypfasbuiq._file
Verdict:
malicious
Label(s):
unc_loader_037
Create hunting rule
formbook
Create hunting rule
Similar samples:
1a7f0d9842f11511d2b604c123882d5b998afc6d51cb958546eff332a86e5f0a
Formbook
2641d864d67844df7ceab8302836407bb07c23f8a8e1c7556212b35d4650db86
Formbook
28a65019d2736dd82fdb229c9e6f5ff053c25e095d118ae03359238f44ba22d7
Formbook
3011a6748e93cfd402bfb34fa6ff8fe8a1f907b150ec6957d5a84a6f44249a16
Formbook
44364cc9748a4faccf19645db786945831fec60aae58f10dfb002ab439479f1b
Formbook
a66fd780dafe112e8ee95dd63b7d6138fea1e5273b961b2774e3be95a677990d
Formbook
+ 4'578 additional samples on MalwareBazaar
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook campaign:i26e discovery rat spyware stealer trojan
Link:
https://tria.ge/reports/250610-neyqbsdl4y/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious use of WriteProcessMemory
System Location Discovery: System Language Discovery
Suspicious use of SetThreadContext
Formbook payload
Formbook
Formbook family
Verdict:
Malicious
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/01f4470a-3a36-4f6b-bacd-ce2b2f7808d4
Unpacked files
SH256 hash:
13d5f928a4a2b54818e4ac7e8a629e50536462929d5a338415a3618794120d11
MD5 hash:
ed387f51ff79d3a3a30571447d8680b5
SHA1 hash:
5860cdcffa9473711c9af8505a6aad1ba262af64
Link:
https://www.unpac.me/results/4f3e1893-dacb-452d-aaac-9af04fc27d58/
SH256 hash:
ff55838cf83322ceab30a512da916f2821181007e95c8fa68674825df8c819b4
MD5 hash:
c9d09ec2449e60042cfc5222e0905ac9
SHA1 hash:
00f21d00230d6595f91ea5c990910f86bbfa44b1
Link:
https://www.unpac.me/results/4f3e1893-dacb-452d-aaac-9af04fc27d58/
SH256 hash:
acf2acb8d7bbf41c95285302f55a5237411c6dd3ed69f51c83657218312315ee
MD5 hash:
3f0120a4612faddbe735b539bb87f471
SHA1 hash:
ce0e0851c10e750a4633b24a45ce03a86b2046f7
Detections:
SUSP_OBF_NET_ConfuserEx_Name_Pattern_Jan24
Create hunting rule
SUSP_OBF_NET_Reactor_Indicators_Jan24
Create hunting rule
Link:
https://www.unpac.me/results/4f3e1893-dacb-452d-aaac-9af04fc27d58/
SH256 hash:
8ce199b5554f819cdbfb01bcfc00e08bdbe69340c14aa39829cb0f65b1a9eb03
MD5 hash:
7803d86c34f1d4d168542fb3781d330b
SHA1 hash:
90969adf903acc89ce3a61b570c3f9c06dee34ed
Detections:
win_formbook_w0
Create hunting rule
win_formbook_g0
Create hunting rule
win_formbook_auto
Create hunting rule
FormBook
Create hunting rule
Windows_Trojan_Formbook
Create hunting rule
Formbook
Create hunting rule
Link:
https://www.unpac.me/results/4f3e1893-dacb-452d-aaac-9af04fc27d58/
Parent samples :
2641d864d67844df7ceab8302836407bb07c23f8a8e1c7556212b35d4650db86
82f415c500ccb21a936a061f3ae04c255fee596102d783f91c7fcb6e2a7a1e8d
13d5f928a4a2b54818e4ac7e8a629e50536462929d5a338415a3618794120d11
8d8125ab11e71b1f93a499ebfcf39c91ad208f3260fa3a848188a0b39cba3898
Please note that we are no longer able to provide a coverage score for Virus Total.

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:Formbook
Create hunting rule
Author:JPCERT/CC Incident Response Group
Description:detect Formbook in memory
Reference:internal research
Rule name:meth_stackstrings
Create hunting rule
Author:Willi Ballenthin
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:RIPEMD160_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for RIPEMD-160 constants
Rule name:SHA1_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for SHA1 constants
Rule name:Skystars_Malware_Imphash
Create hunting rule
Author:Skystars LightDefender
Description:imphash
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)
Rule name:Windows_Trojan_Formbook
Create hunting rule
Author:@malgamy12
Rule name:Windows_Trojan_Formbook_1112e116
Create hunting rule
Author:Elastic Security
Reference:https://www.elastic.co/security-labs/formbook-adopts-cab-less-approach
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.

Cape
Cape
https://www.capesandbox.com/analysis/8747/

BLint

The following table provides more information about this file using BLint. BLint is a Binary Linter to check the security properties, and capabilities in executables.

Findings
IDTitleSeverity
CHECK_AUTHENTICODEMissing Authenticodehigh
CHECK_DLL_CHARACTERISTICSMissing dll Security Characteristics (HIGH_ENTROPY_VA)high

Comments