MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 8a91c4bf99a674909e6993d52e061547517056d36f9b8e828a9148eb412ffa73. 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: 18


Intelligence 18 IOCs YARA 5 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 8a91c4bf99a674909e6993d52e061547517056d36f9b8e828a9148eb412ffa73
SHA3-384 hash: 35c1b30c5509f3b3f932428bd5b6841c7661a989802ca0d0ee6f4cf78a41c1fd2ae97b4bb7e347caed9ec6883fdcb58d
SHA1 hash: f773bdd6e924b65284d8a9ef67f61615a9764a8e
MD5 hash: 1b597c240cd23fda73024ed811e4a906
humanhash: robin-snake-helium-hotel
File name:Invoice_Payment_Confirmation_INV#240085_pdf.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:1'106'944 bytes
First seen:2024-11-14 02:43:18 UTC
Last seen:2024-11-14 11:22:39 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash 3d95adbf13bbe79dc24dccb401c12091 (881 x AgentTesla, 737 x FormBook, 236 x SnakeKeylogger)
ssdeep 24576:Etb20pkaCqT5TBWgNQ7aXe1SQkPXr8mzcLk6A:tVg5tQ7aXe1bkPXAmzcY5
TLSH T19735CF1373DD8365C7725273BA16B741AEBF782506A1F96B2FD8093DEC20122521EA73
TrID 68.8% (.CPL) Windows Control Panel Item (generic) (57583/11/19)
12.5% (.EXE) Win64 Executable (generic) (10522/11/4)
6.0% (.EXE) Win16 NE executable (generic) (5038/12/1)
5.3% (.EXE) Win32 Executable (generic) (4504/4/1)
2.4% (.EXE) OS/2 Executable (generic) (2029/13)
Magika pebin
File icon (PE):PE icon
dhash icon aae2f3e38383b629 (2'034 x Formbook, 1'183 x CredentialFlusher, 666 x AgentTesla)
Reporter threatcat_ch
Tags:exe FormBook

Intelligence

File Origin
# of uploads :
2
# of downloads :
510
Origin country :
CH CH
Vendor Threat Intelligence
Malware family:
formbook
Create hunting rule
ID:
1
File name:
Invoice_Payment_Confirmation_INV#240085_pdf.exe
Verdict:
Malicious activity
Analysis date:
2024-11-14 02:43:55 UTC
Tags:
autoit formbook xloader
Link:
https://app.any.run/tasks/c0389adc-c649-4f36-8f4e-e544fb564a51

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

Verdict:
Malicious
Score:
99.9%
Link:
https://cyber-fortress.com/docs/result/index.php?id=6735644034b6906b3482a471
Tags:
underscore autorun autoit emotet
Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
Creating a window
Creating a file in the %temp% directory
Creating a file
Creating a process from a recently created file
Launching a process
Launching the process to change network settings
Сreating synchronization primitives
Launching cmd.exe command interpreter
Setting browser functions hooks
Enabling autorun by creating a file
Unauthorized injection to a system process
Unauthorized injection to a browser process
Verdict:
Likely Malicious
Threat level:
  7.5/10
Confidence:
100%
Tags:
anti-vm anti-vm autoit compiled-script fingerprint keylogger masquerade microsoft_visual_cc packed packed packer_detected
Link:
https://www.filescan.io/uploads/673563f2eb893e5fda464677/reports/6a3f3090-f896-455f-88d1-c701e39a5e69/overview
Verdict:
Malicious
Labled as:
Win/malicious_confidence_70%
Link:
https://www.hybrid-analysis.com/sample/8a91c4bf99a674909e6993d52e061547517056d36f9b8e828a9148eb412ffa73
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/0f86c0da-dec9-4742-826c-7d02cf305f99
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1555535
Signature
AI detected suspicious sample
Binary is likely a compiled AutoIt script file
C2 URLs / IPs found in malware configuration
Drops VBS files to the startup folder
Found malware configuration
Initial sample is a PE file and has a suspicious name
Machine Learning detection for dropped file
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 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: CMSTP Execution Process Creation
Sigma detected: Drops script at startup location
Sigma detected: WScript or CScript Dropper
Switches to a custom stack to bypass stack traces
Tries to detect virtualization through RDTSC time measurements
Tries to resolve many domain names, but no domain seems valid
Windows Scripting host queries suspicious COM object (likely to drop second stage)
Writes to foreign memory regions
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1555535 Sample: Invoice_Payment_Confirmatio... Startdate: 14/11/2024 Architecture: WINDOWS Score: 100 48 www.uqhi42.xyz 2->48 50 www.specially-smou.xyz 2->50 52 10 other IPs or domains 2->52 68 Found malware configuration 2->68 70 Malicious sample detected (through community Yara rule) 2->70 72 Multi AV Scanner detection for submitted file 2->72 76 10 other signatures 2->76 12 Invoice_Payment_Confirmation_INV#240085_pdf.exe 4 2->12         started        signatures3 74 Performs DNS queries to domains with low reputation 50->74 process4 file5 46 C:\Users\user\AppData\Local\...\Dunlop.exe, PE32 12->46 dropped 102 Binary is likely a compiled AutoIt script file 12->102 16 Dunlop.exe 2 12->16         started        signatures6 process7 file8 44 C:\Users\user\AppData\Roaming\...\Dunlop.vbs, data 16->44 dropped 54 Multi AV Scanner detection for dropped file 16->54 56 Binary is likely a compiled AutoIt script file 16->56 58 Machine Learning detection for dropped file 16->58 60 4 other signatures 16->60 20 svchost.exe 16->20         started        signatures9 process10 signatures11 78 Modifies the context of a thread in another process (thread injection) 20->78 80 Maps a DLL or memory area into another process 20->80 82 Sample uses process hollowing technique 20->82 84 3 other signatures 20->84 23 explorer.exe 74 2 20->23 injected process12 process13 25 wscript.exe 1 23->25         started        28 cmstp.exe 23->28         started        30 colorcpl.exe 23->30         started        32 autoconv.exe 23->32         started        signatures14 92 Windows Scripting host queries suspicious COM object (likely to drop second stage) 25->92 34 Dunlop.exe 1 25->34         started        94 Modifies the context of a thread in another process (thread injection) 28->94 96 Maps a DLL or memory area into another process 28->96 98 Tries to detect virtualization through RDTSC time measurements 28->98 100 Switches to a custom stack to bypass stack traces 28->100 37 cmd.exe 1 28->37         started        process15 signatures16 62 Binary is likely a compiled AutoIt script file 34->62 64 Writes to foreign memory regions 34->64 66 Maps a DLL or memory area into another process 34->66 39 svchost.exe 34->39         started        42 conhost.exe 37->42         started        process17 signatures18 86 Modifies the context of a thread in another process (thread injection) 39->86 88 Maps a DLL or memory area into another process 39->88 90 Sample uses process hollowing technique 39->90
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/8a91c4bf99a674909e6993d52e061547517056d36f9b8e828a9148eb412ffa73
Detection:
formbook
Create hunting rule
Link:
https://mwdb.cert.pl/sample/8a91c4bf99a674909e6993d52e061547517056d36f9b8e828a9148eb412ffa73/
Threat name:
Win32.Trojan.AutoitInject
Create hunting rule
Status:
Malicious
First seen:
2024-11-14 00:23:04 UTC
AV detection:
21 of 38 (55.26%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=rki4jp4zuz2jbhtjspks4bqvi5ixavwtn6ny5auksfeowqjp7jzq._file
Verdict:
malicious
Label(s):
unknown_loader_036
Create hunting rule
formbook
Create hunting rule
autoit
Create hunting rule
Similar samples:
error
Formbook
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook campaign:f29s discovery rat spyware stealer trojan
Link:
https://tria.ge/reports/241114-c75tkaxjdr/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of UnmapMainImage
Suspicious use of WriteProcessMemory
System Location Discovery: System Language Discovery
AutoIT Executable
Suspicious use of SetThreadContext
Drops startup file
Executes dropped EXE
Loads dropped DLL
Formbook payload
Formbook
Formbook family
Verdict:
Malicious
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/43573dd6-f348-4f96-bd0e-36f85b1a381b
Unpacked files
SH256 hash:
c2dd4739624be246a6e782ef7527fe164d03c31a39282bd906369ac6899ca51d
MD5 hash:
a06ced4d9f98225a3fcac8d2adc0eeb1
SHA1 hash:
3cc9be21901db097d0f2bb06d134145b6894ae99
Detections:
FormBook
Create hunting rule
win_formbook_auto
Create hunting rule
win_formbook_g0
Create hunting rule
win_formbook_w0
Create hunting rule
Formbook
Create hunting rule
Windows_Trojan_Formbook
Create hunting rule
Link:
https://www.unpac.me/results/5a74383e-cee6-40b7-a547-899c514053f5/
Parent samples :
06043959e79bbeccaa6370466d3b9745b684ddaede9d2b4e6b652c926fbebe74
1c8de42bff76a20cdaee2bed7629f8f0dfcf4ab5c7b5ee637d147f6f45311015
d6254ba7494dc16f4b33c879f44fda381215ce53c01319e45f97a2b661e11cc2
f9264179af743b510f7158e518141c28d4e0132591f3dfb360a2b1277180dc7e
2369682a410e0b6aee1180d411eea77ee8942c58845f28d6afa79a1b5b4152ac
8a91c4bf99a674909e6993d52e061547517056d36f9b8e828a9148eb412ffa73
SH256 hash:
8a91c4bf99a674909e6993d52e061547517056d36f9b8e828a9148eb412ffa73
MD5 hash:
1b597c240cd23fda73024ed811e4a906
SHA1 hash:
f773bdd6e924b65284d8a9ef67f61615a9764a8e
Link:
https://www.unpac.me/results/5a74383e-cee6-40b7-a547-899c514053f5/
Malware family:
FormBook
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/8a91c4bf99a6/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/8a91c4bf99a674909e6993d52e061547517056d36f9b8e828a9148eb412ffa73

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:AutoIT_Compiled
Create hunting rule
Author:@bartblaze
Description:Identifies compiled AutoIT script (as EXE). This rule by itself does NOT necessarily mean the detected file is malicious.
Rule name:DebuggerCheck__API
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:RansomPyShield_Antiransomware
Create hunting rule
Author:XiAnzheng
Description:Checking for malicious import combination that common Ransomware mostly use
Rule name:YahLover
Create hunting rule
Author:Kevin Falcoz
Description:YahLover

File information

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

Malspam

Formbook

Executable exe 8a91c4bf99a674909e6993d52e061547517056d36f9b8e828a9148eb412ffa73

(this sample)

  
Delivery method
Distributed via e-mail attachment

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
CHECK_NXMissing Non-Executable Memory Protectioncritical
Reviews
IDCapabilitiesEvidence
AUTH_APIManipulates User AuthorizationADVAPI32.dll::AllocateAndInitializeSid
ADVAPI32.dll::CopySid
ADVAPI32.dll::FreeSid
ADVAPI32.dll::GetLengthSid
ADVAPI32.dll::GetTokenInformation
ADVAPI32.dll::GetAce
COM_BASE_APICan Download & Execute componentsole32.dll::CLSIDFromProgID
ole32.dll::CoCreateInstance
ole32.dll::CoCreateInstanceEx
ole32.dll::CoInitializeSecurity
ole32.dll::CreateStreamOnHGlobal
MULTIMEDIA_APICan Play MultimediaWINMM.dll::mciSendStringW
WINMM.dll::timeGetTime
WINMM.dll::waveOutSetVolume
SECURITY_BASE_APIUses Security Base APIADVAPI32.dll::AddAce
ADVAPI32.dll::AdjustTokenPrivileges
ADVAPI32.dll::CheckTokenMembership
ADVAPI32.dll::DuplicateTokenEx
ADVAPI32.dll::GetAclInformation
ADVAPI32.dll::GetSecurityDescriptorDacl
SHELL_APIManipulates System ShellSHELL32.dll::ShellExecuteExW
SHELL32.dll::ShellExecuteW
SHELL32.dll::SHFileOperationW
WIN32_PROCESS_APICan Create Process and ThreadsADVAPI32.dll::CreateProcessAsUserW
KERNEL32.dll::CreateProcessW
ADVAPI32.dll::CreateProcessWithLogonW
KERNEL32.dll::OpenProcess
ADVAPI32.dll::OpenProcessToken
ADVAPI32.dll::OpenThreadToken
WIN_BASE_APIUses Win Base APIKERNEL32.dll::TerminateProcess
KERNEL32.dll::SetSystemPowerState
KERNEL32.dll::LoadLibraryA
KERNEL32.dll::LoadLibraryExW
KERNEL32.dll::LoadLibraryW
KERNEL32.dll::GetDriveTypeW
WIN_BASE_EXEC_APICan Execute other programsKERNEL32.dll::WriteConsoleW
KERNEL32.dll::ReadConsoleW
KERNEL32.dll::SetStdHandle
KERNEL32.dll::GetConsoleCP
KERNEL32.dll::GetConsoleMode
WIN_BASE_IO_APICan Create FilesKERNEL32.dll::CopyFileW
KERNEL32.dll::CreateDirectoryW
KERNEL32.dll::CreateHardLinkW
IPHLPAPI.DLL::IcmpCreateFile
KERNEL32.dll::CreateFileW
KERNEL32.dll::DeleteFileW
WIN_BASE_USER_APIRetrieves Account InformationKERNEL32.dll::GetComputerNameW
ADVAPI32.dll::GetUserNameW
ADVAPI32.dll::LogonUserW
ADVAPI32.dll::LookupPrivilegeValueW
WIN_NETWORK_APISupports Windows NetworkingMPR.dll::WNetAddConnection2W
MPR.dll::WNetUseConnectionW
WIN_REG_APICan Manipulate Windows RegistryADVAPI32.dll::RegConnectRegistryW
ADVAPI32.dll::RegCreateKeyExW
ADVAPI32.dll::RegDeleteKeyW
ADVAPI32.dll::RegOpenKeyExW
ADVAPI32.dll::RegQueryValueExW
ADVAPI32.dll::RegSetValueExW
WIN_USER_APIPerforms GUI ActionsUSER32.dll::BlockInput
USER32.dll::CloseDesktop
USER32.dll::CreateMenu
USER32.dll::EmptyClipboard
USER32.dll::FindWindowExW
USER32.dll::FindWindowW

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