MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 a99557a845d8d3d6a2f5d4ee8f51baf5b19960ddb827f1668598942737b8952c. 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: 20


Intelligence 20 IOCs YARA 6 File information Comments
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SHA256 hash: a99557a845d8d3d6a2f5d4ee8f51baf5b19960ddb827f1668598942737b8952c
SHA3-384 hash: 972f9e4b307febec40d6f7c0e70ab3e3ff2a2105bef60ec93a2b5c3051b07d50ac08d49a6ac894c0b0d8cdad8be8236e
SHA1 hash: 55b8237c28442248ee3369f5314b9126510b2b06
MD5 hash: 13840a7187259c7eabda7eaa4a3f1129
humanhash: hawaii-yankee-nitrogen-neptune
File name:PO-6271433 Revised.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:681'472 bytes
First seen:2025-02-11 17:27:15 UTC
Last seen:2025-02-11 18:44:40 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'744 x AgentTesla, 19'614 x Formbook, 12'242 x SnakeKeylogger)
ssdeep 12288:CAbZWUBjGOMTP2CzC60TPeSFOXELS4Y9bxrTJrpBSv:XbYUoOkPM78BZTJrs
Threatray 4'314 similar samples on MalwareBazaar
TLSH T10DE4E0C43B26B706DE695A309A34DDB493A81DE8B400B9E36FD93F5BB9AC1125D0CF05
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 abuse_ch
Tags:exe FormBook

Intelligence

File Origin
# of uploads :
2
# of downloads :
452
Origin country :
NL NL
Vendor Threat Intelligence
Malware family:
formbook
Create hunting rule
ID:
1
File name:
3.exe
Verdict:
Malicious activity
Analysis date:
2025-02-10 11:12:35 UTC
Tags:
formbook stealer xloader
Link:
https://app.any.run/tasks/03a64753-477b-40b0-bdc1-dc6756df4a90

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection(s):
SecuriteInfo.com.BackDoor.AgentTeslaNET.20.27430.26323.UNOFFICIAL
Create hunting rule

Verdict:
Malicious
Score:
96.5%
Link:
https://cyber-fortress.com/docs/result/index.php?id=67ab88c43f78927cc2ccdb78
Tags:
phishing virus micro
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Unauthorized injection to a recently created process
Restart of the analyzed sample
Creating a file
Launching a process
Сreating synchronization primitives
Launching cmd.exe command interpreter
Setting browser functions hooks
Unauthorized injection to a system process
Unauthorized injection to a browser process
Verdict:
Likely Malicious
Threat level:
  7.5/10
Confidence:
100%
Tags:
obfuscated obfuscated packed packed packer_detected phishing
Link:
https://www.filescan.io/uploads/67ab88b7ab89d0e9199ef923/reports/99be331e-38e0-46b6-b7e7-183a2d5aefd0/overview
Verdict:
Malicious
Labled as:
Trojan.Generic
Link:
https://www.hybrid-analysis.com/sample/a99557a845d8d3d6a2f5d4ee8f51baf5b19960ddb827f1668598942737b8952c
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:
Formbook
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/a9b909f3-eda7-47db-b160-834d523e8b7e
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1612341
Signature
.NET source code contains potential unpacker
C2 URLs / IPs found in malware configuration
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
Machine Learning detection for 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)
Multi AV Scanner detection for submitted file
Query firmware table information (likely to detect VMs)
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Switches to a custom stack to bypass stack traces
System process connects to network (likely due to code injection or exploit)
Tries to detect virtualization through RDTSC time measurements
Yara detected AntiVM3
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1612341 Sample: PO-6271433 Revised.exe Startdate: 11/02/2025 Architecture: WINDOWS Score: 100 39 www.ovixo.shop 2->39 41 www.oturkishiixx0q.shop 2->41 43 5 other IPs or domains 2->43 47 Found malware configuration 2->47 49 Malicious sample detected (through community Yara rule) 2->49 51 Multi AV Scanner detection for submitted file 2->51 53 8 other signatures 2->53 11 PO-6271433 Revised.exe 3 2->11         started        signatures3 process4 file5 37 C:\Users\user\...\PO-6271433 Revised.exe.log, ASCII 11->37 dropped 67 Injects a PE file into a foreign processes 11->67 15 PO-6271433 Revised.exe 11->15         started        signatures6 process7 signatures8 69 Modifies the context of a thread in another process (thread injection) 15->69 71 Maps a DLL or memory area into another process 15->71 73 Sample uses process hollowing technique 15->73 75 2 other signatures 15->75 18 explorer.exe 30 1 15->18 injected process9 process10 20 WWAHost.exe 18->20         started        23 WerFault.exe 21 18->23         started        signatures11 55 Modifies the context of a thread in another process (thread injection) 20->55 57 Maps a DLL or memory area into another process 20->57 59 Tries to detect virtualization through RDTSC time measurements 20->59 61 Switches to a custom stack to bypass stack traces 20->61 25 explorer.exe 20->25         started        28 explorer.exe 3 136 20->28         started        31 cmd.exe 1 20->31         started        process12 dnsIp13 63 System process connects to network (likely due to code injection or exploit) 25->63 65 Query firmware table information (likely to detect VMs) 25->65 45 a-0003.a-msedge.net 204.79.197.203, 443, 49717, 49721 MICROSOFT-CORP-MSN-AS-BLOCKUS United States 28->45 33 WerFault.exe 28->33         started        35 conhost.exe 31->35         started        signatures14 process15
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/a99557a845d8d3d6a2f5d4ee8f51baf5b19960ddb827f1668598942737b8952c
Detection:
formbook
Create hunting rule
Link:
https://mwdb.cert.pl/sample/a99557a845d8d3d6a2f5d4ee8f51baf5b19960ddb827f1668598942737b8952c/
Threat name:
ByteCode-MSIL.Trojan.AgentTesla
Create hunting rule
Status:
Malicious
First seen:
2025-02-10 10:26:05 UTC
File Type:
PE (.Net Exe)
Extracted files:
9
AV detection:
22 of 24 (91.67%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=vgkvpkcf3dj5nixv2txi6un26wyzsyg5xat7czuftckcon5ysuwa._file
Verdict:
malicious
Label(s):
formbook
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unknown_loader_037
Create hunting rule
Similar samples:
06043959e79bbeccaa6370466d3b9745b684ddaede9d2b4e6b652c926fbebe74
Formbook
1c8de42bff76a20cdaee2bed7629f8f0dfcf4ab5c7b5ee637d147f6f45311015
Formbook
6042e232fb52a8ddef6d8107806b2eb734cf4a703941e4639e5d3aa8a27d2023
Formbook
78854920bdb00256902029bebce69365c42a97b0431ff35c48f6faf5951f24e3
Formbook
a99557a845d8d3d6a2f5d4ee8f51baf5b19960ddb827f1668598942737b8952c
Formbook
d6254ba7494dc16f4b33c879f44fda381215ce53c01319e45f97a2b661e11cc2
Formbook
error
Formbook
f9264179af743b510f7158e518141c28d4e0132591f3dfb360a2b1277180dc7e
Formbook
+ 4'304 additional samples on MalwareBazaar
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook campaign:i62s discovery rat spyware stealer trojan
Link:
https://tria.ge/reports/250211-v1mzaatqan/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
System Location Discovery: System Language Discovery
System Network Configuration Discovery: Internet Connection Discovery
Suspicious use of SetThreadContext
Deletes itself
Downloads MZ/PE file
Formbook payload
Formbook
Formbook family
Verdict:
Malicious
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/23b0d799-47f4-4ae9-a729-85982ff554a4
Unpacked files
SH256 hash:
a99557a845d8d3d6a2f5d4ee8f51baf5b19960ddb827f1668598942737b8952c
MD5 hash:
13840a7187259c7eabda7eaa4a3f1129
SHA1 hash:
55b8237c28442248ee3369f5314b9126510b2b06
Link:
https://www.unpac.me/results/d6fa087c-5085-4e22-924b-5141cbc315d6/
SH256 hash:
01995defedaf99564fee37f026dc9106fe716d14f13ace550704af00739a4fe3
MD5 hash:
4125504608c5b9b0d42ed4fbf8b5c2ba
SHA1 hash:
1660f1d9212c28404b92a4d8482a479d0f5aecc0
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/d6fa087c-5085-4e22-924b-5141cbc315d6/
SH256 hash:
e712bcd56fe64742c0f674f3acff83490f8103c260ea3389f56151b5066b7cd3
MD5 hash:
7bad4197d1ae020c9049a782eb9a71d2
SHA1 hash:
e1253047ea92beb7d161b106765ad8b03bc86b1e
Link:
https://www.unpac.me/results/d6fa087c-5085-4e22-924b-5141cbc315d6/
SH256 hash:
ebaaed27b4824f75954081c97a7b5a24dd2a1c908d8159bdf87c8b367fd714ff
MD5 hash:
a048b9dd4a2e301e0edf4928c737a24c
SHA1 hash:
8fc397a1b50cac63953b2296b840a95d9a4ce365
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/d6fa087c-5085-4e22-924b-5141cbc315d6/
Parent samples :
a99557a845d8d3d6a2f5d4ee8f51baf5b19960ddb827f1668598942737b8952c
498abceba59d18a6f83bf57dae6cefa9d79de97fc98b73a828640554f8879f10
c53617ff657a785641f0ba07fb40f487eeb6cda98a7edd7e5320afb804d1b4fa
ad27bf984545e4882d173b0ff31f0eb8bd1cb5193658c8a0bdd129f4f4b6607e
3905a3dc4fb6f3ec78e34ca229a8c245bc7640f042598576635e37ed011e4484
3332610eab9693c63aece8922d85a64e32a6dcf9847f73270ca4cc3136c48968
eb466ca2ee59c8b6cbc104ef8b42ecda98ac1ca14eb2cd2ced5d6f6b8e8d3ab4
Malware family:
FormBook
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/a99557a845d8/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/a99557a845d8d3d6a2f5d4ee8f51baf5b19960ddb827f1668598942737b8952c

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:AgentTesla_DIFF_Common_Strings_01
Create hunting rule
Author:schmidtsz
Description:Identify partial Agent Tesla strings
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.

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

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