MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 671d735f75ad64e15389e390fd26190d5f96aa4c8b95602cc5103be88ca42778. 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 5 File information Comments
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SHA256 hash: 671d735f75ad64e15389e390fd26190d5f96aa4c8b95602cc5103be88ca42778
SHA3-384 hash: 10c316baaa065a0731f0bb543b4df159e83351b4ec875c163e775099569a9b471d6f7e473fe239ca1536e97fd911aef4
SHA1 hash: 9582070007a25efe5686335bf87196fb5ac2cced
MD5 hash: fcef9e7dfe6fb460611e8d8424e95917
humanhash: asparagus-iowa-louisiana-kilo
File name:RFQ00575.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:675'840 bytes
First seen:2025-07-01 19:13:25 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'650 x AgentTesla, 19'462 x Formbook, 12'203 x SnakeKeylogger)
ssdeep 12288:e+ijMedqECF5fFdusAZxpyFkoZ99ZDcy0GpOH6Gy+bUCa8:MSEccsGxpgr99hcy0GVGy9C
TLSH T187E402492699CF17D5F74BF04521E1B053F85E9F2021D31BAECABCEB792AB110A42793
TrID 69.7% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13)
10.0% (.EXE) Win64 Executable (generic) (10522/11/4)
6.2% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
4.2% (.EXE) Win32 Executable (generic) (4504/4/1)
1.9% (.EXE) Win16/32 Executable Delphi generic (2072/23)
Magika pebin
Reporter abuse_ch
Tags:exe FormBook

Intelligence

File Origin
# of uploads :
1
# of downloads :
18
Origin country :
SE SE
Vendor Threat Intelligence
Detection:
Formbook
Create hunting rule
Link:
https://www.capesandbox.com/analysis/11864/
Verdict:
Malicious
Score:
92.5%
Link:
https://cyber-fortress.com/docs/result/index.php?id=6864339137c34367794885c4
Tags:
micro spawn shell
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Creating a file in the %AppData% directory
Enabling the 'hidden' option for recently created files
Adding an access-denied ACE
Сreating synchronization primitives
Creating a process with a hidden window
Creating a file in the %temp% directory
Launching a process
Unauthorized injection to a recently created process
Restart of the analyzed sample
Creating a file
Launching cmd.exe command interpreter
Setting browser functions hooks
Adding an exclusion to Microsoft Defender
Enabling autorun by creating a file
Unauthorized injection to a system process
Unauthorized injection to a browser process
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
base64 bitmap obfuscated obfuscated packed packed packed phishing reconnaissance roboski stego vbnet
Link:
https://www.filescan.io/uploads/68643392ee5b1c8f3d234770/reports/6f0cbd4b-a06a-48ba-a5d9-b1f8612dbe77/overview
Verdict:
Malicious
Labled as:
Win/malicious_confidence_100%
Link:
https://www.hybrid-analysis.com/sample/671d735f75ad64e15389e390fd26190d5f96aa4c8b95602cc5103be88ca42778
Malware family:
Formbook
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/9805d6a1-2b0d-4657-893e-b67a7bfba50f
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1726650
Signature
.NET source code contains potential unpacker
Adds a directory exclusion to Windows Defender
C2 URLs / IPs found in malware configuration
Found direct / indirect Syscall (likely to bypass EDR)
Found malware configuration
Initial sample is a PE file and has a suspicious name
Injects a PE file into a foreign processes
Joe Sandbox ML detected suspicious sample
Loading BitLocker PowerShell Module
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 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)
Sample uses process hollowing technique
Sigma detected: Powershell Base64 Encoded MpPreference Cmdlet
Sigma detected: Scheduled temp file as task from temp location
Suricata IDS alerts for network traffic
Switches to a custom stack to bypass stack traces
Tries to detect virtualization through RDTSC time measurements
Uses schtasks.exe or at.exe to add and modify task schedules
Yara detected AntiVM3
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1726650 Sample: RFQ00575.exe Startdate: 01/07/2025 Architecture: WINDOWS Score: 100 57 www.ukangzhe.xyz 2->57 59 www.w-vshop7-eleven.top 2->59 61 3 other IPs or domains 2->61 75 Suricata IDS alerts for network traffic 2->75 77 Found malware configuration 2->77 79 Malicious sample detected (through community Yara rule) 2->79 83 10 other signatures 2->83 11 RFQ00575.exe 7 2->11         started        15 zOpSkKSz.exe 5 2->15         started        signatures3 81 Performs DNS queries to domains with low reputation 57->81 process4 file5 49 C:\Users\user\AppData\Roaming\zOpSkKSz.exe, PE32 11->49 dropped 51 C:\Users\...\zOpSkKSz.exe:Zone.Identifier, ASCII 11->51 dropped 53 C:\Users\user\AppData\Local\...\tmp62FC.tmp, XML 11->53 dropped 55 C:\Users\user\AppData\...\RFQ00575.exe.log, ASCII 11->55 dropped 93 Uses schtasks.exe or at.exe to add and modify task schedules 11->93 95 Adds a directory exclusion to Windows Defender 11->95 97 Tries to detect virtualization through RDTSC time measurements 11->97 17 RFQ00575.exe 11->17         started        20 powershell.exe 22 11->20         started        22 schtasks.exe 1 11->22         started        24 RFQ00575.exe 11->24         started        99 Multi AV Scanner detection for dropped file 15->99 101 Injects a PE file into a foreign processes 15->101 103 Switches to a custom stack to bypass stack traces 15->103 26 zOpSkKSz.exe 15->26         started        28 schtasks.exe 1 15->28         started        signatures6 process7 signatures8 63 Modifies the context of a thread in another process (thread injection) 17->63 65 Maps a DLL or memory area into another process 17->65 67 Sample uses process hollowing technique 17->67 69 Queues an APC in another process (thread injection) 17->69 30 explorer.exe 36 1 17->30 injected 71 Loading BitLocker PowerShell Module 20->71 32 WmiPrvSE.exe 20->32         started        34 conhost.exe 20->34         started        36 conhost.exe 22->36         started        73 Found direct / indirect Syscall (likely to bypass EDR) 26->73 38 conhost.exe 28->38         started        process9 process10 40 cmmon32.exe 30->40         started        43 msiexec.exe 30->43         started        signatures11 85 Modifies the context of a thread in another process (thread injection) 40->85 87 Maps a DLL or memory area into another process 40->87 89 Tries to detect virtualization through RDTSC time measurements 40->89 91 Switches to a custom stack to bypass stack traces 40->91 45 cmd.exe 40->45         started        process12 process13 47 conhost.exe 45->47         started       
Score:
99%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/671d735f75ad64e15389e390fd26190d5f96aa4c8b95602cc5103be88ca42778
Verdict:
inconclusive
YARA:
5 match(es)
Tags:
Executable PE (Portable Executable) Win 32 Exe x86
Link:
https://app.malva.re/file/fcef9e7dfe6fb460611e8d8424e95917
Detection:
formbook
Create hunting rule
Link:
https://mwdb.cert.pl/sample/671d735f75ad64e15389e390fd26190d5f96aa4c8b95602cc5103be88ca42778/
Threat name:
Win32.Backdoor.FormBook
Create hunting rule
Status:
Malicious
First seen:
2025-07-01 08:46:36 UTC
File Type:
PE (.Net Exe)
Extracted files:
22
AV detection:
20 of 38 (52.63%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=m4oxgx3vvvsocu4j4oip2jqzbvpznksmrokwalgfca56rdfee54a._file
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook campaign:ms14 discovery execution rat spyware stealer trojan
Link:
https://tria.ge/reports/250701-xxs28sgl91/
Behaviour
Modifies registry class
Scheduled Task/Job: Scheduled Task
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of UnmapMainImage
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
System Location Discovery: System Language Discovery
Suspicious use of SetThreadContext
Checks computer location settings
Command and Scripting Interpreter: PowerShell
Formbook payload
Formbook
Formbook family
Verdict:
Unknown
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/2b1b5dd9-7000-4c1f-b97e-bd60604b0610
Unpacked files
SH256 hash:
671d735f75ad64e15389e390fd26190d5f96aa4c8b95602cc5103be88ca42778
MD5 hash:
fcef9e7dfe6fb460611e8d8424e95917
SHA1 hash:
9582070007a25efe5686335bf87196fb5ac2cced
Link:
https://www.unpac.me/results/b1c13a3b-36af-4542-a80c-84ced27c6287/
SH256 hash:
7ebfba3fdcf4d0d5e8ecd0445a23dfc046da4b2e4d48bab6473814dcf199ee45
MD5 hash:
9a18eb425213582f8674e26abf5a57fd
SHA1 hash:
0985b8c659415f880c159fc66a16ae75c9345fd6
Link:
https://www.unpac.me/results/b1c13a3b-36af-4542-a80c-84ced27c6287/
SH256 hash:
ebadb1a4881dccd02983aa099250758cab4b3a15b5996e2dede1c8cb36ae91af
MD5 hash:
f58d7414ccc40c20293f119ebed0674e
SHA1 hash:
7bf0c90a2293445fecbad176ab003e05f5df4ce3
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/b1c13a3b-36af-4542-a80c-84ced27c6287/
SH256 hash:
e1caf8471257bfc0080de5cfc57e74e415f324580b319e2927373175167fcdff
MD5 hash:
623999da965123f92d97531ea7849b8c
SHA1 hash:
fb28a78b6aa57ad83faa843a8e194da88cbc559c
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/b1c13a3b-36af-4542-a80c-84ced27c6287/
Parent samples :
671d735f75ad64e15389e390fd26190d5f96aa4c8b95602cc5103be88ca42778
617bf6800d42409a74ae0539d3e3ffc412e6c4bb137c232159c3ca946bc0fcdd
602caaecd7dca945a17cbe1522c89c7e6cb52330d2865f77637652009271553c
de98c233b168483faa99395c4308b612a4399b89b69aeacc4244045f05802b4f
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/671d735f75ad64e15389e390fd26190d5f96aa4c8b95602cc5103be88ca42778

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:NETexecutableMicrosoft
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: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.

Cape
Cape
https://www.capesandbox.com/analysis/11864/

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 (GUARD_CF)high

Comments