MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 543488926596ff1e2874b039ecfcbdbca619e49598111df0e7531c469de68cfe. 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: 16


Intelligence 16 IOCs YARA 17 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 543488926596ff1e2874b039ecfcbdbca619e49598111df0e7531c469de68cfe
SHA3-384 hash: 71f52ef20087c08496fb09002ea381d1d5d9f16a33ad39f67f98438808729f4850dba597987769b5bb9ecb92576b2b80
SHA1 hash: b316aba50a83d55a40570ae700ea49948d5f04a6
MD5 hash: c4bd09c4c5db94450785bc5ac91b26b3
humanhash: item-shade-oxygen-uniform
File name:PROTEST LETTER.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:1'208'832 bytes
First seen:2025-07-09 11:11:05 UTC
Last seen:2025-07-09 11:33:03 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash 3d95adbf13bbe79dc24dccb401c12091 (881 x AgentTesla, 737 x FormBook, 236 x SnakeKeylogger)
ssdeep 24576:ntb20pkaCqT5TBWgNQ7aw4cqkkOGLTcWM08+H86A:kVg5tQ7aw3LknT40895
Threatray 2'447 similar samples on MalwareBazaar
TLSH T14245CF2363DDC361C3B25273BA257701AEBF782506A1F96B2FD8093DE920162525E773
TrID 40.3% (.EXE) Win64 Executable (generic) (10522/11/4)
19.3% (.EXE) Win16 NE executable (generic) (5038/12/1)
17.2% (.EXE) Win32 Executable (generic) (4504/4/1)
7.7% (.EXE) OS/2 Executable (generic) (2029/13)
7.6% (.EXE) Generic Win/DOS Executable (2002/3)
Magika pebin
dhash icon aae2f3e38383b629 (2'034 x Formbook, 1'183 x CredentialFlusher, 666 x AgentTesla)
Reporter cocaman
Tags:exe FormBook

Intelligence

File Origin
# of uploads :
8
# of downloads :
38
Origin country :
CH CH
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
PROTEST LETTER.exe
Verdict:
No threats detected
Analysis date:
2025-07-09 11:13:17 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/650c9389-ce6c-4819-a6a0-a59483f12f18

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/13668/
Detection(s):
SecuriteInfo.com.PSW.Agent.BORA.UNOFFICIAL
Create hunting rule

Verdict:
Suspicious
Score:
50%
Link:
https://cyber-fortress.com/docs/result/index.php?id=686e4e59900df8e7f868fd44
Tags:
autoit emotet
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Creating a file in the %temp% directory
Launching a process
Сreating synchronization primitives
Sending a custom TCP request
Unauthorized injection to a system process
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
adaptive-context autoit compiled-script fingerprint keylogger microsoft_visual_cc obfuscated packed packed packer_detected
Link:
https://www.filescan.io/uploads/686e4e6061f15fb42a36954a/reports/88024136-e94c-4607-9df0-663b0ba220f6/overview
Verdict:
Malicious
Labled as:
Win/malicious_confidence_60%
Link:
https://www.hybrid-analysis.com/sample/543488926596ff1e2874b039ecfcbdbca619e49598111df0e7531c469de68cfe
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/c9a37719-dd60-43ac-8488-fb490c6ed9ca
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1731763
Signature
Binary is likely a compiled AutoIt script file
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 submitted file
Queues an APC in another process (thread injection)
Suricata IDS alerts for network traffic
Switches to a custom stack to bypass stack traces
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Mail credentials (via file / registry access)
Writes to foreign memory regions
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1731763 Sample: PROTEST LETTER.exe Startdate: 09/07/2025 Architecture: WINDOWS Score: 100 26 www.lonfor.website 2->26 28 www.y6h6kn.top 2->28 30 9 other IPs or domains 2->30 46 Suricata IDS alerts for network traffic 2->46 48 Multi AV Scanner detection for submitted file 2->48 50 Yara detected FormBook 2->50 52 3 other signatures 2->52 10 PROTEST LETTER.exe 4 2->10         started        signatures3 process4 signatures5 54 Binary is likely a compiled AutoIt script file 10->54 56 Writes to foreign memory regions 10->56 58 Maps a DLL or memory area into another process 10->58 13 svchost.exe 10->13         started        process6 signatures7 60 Maps a DLL or memory area into another process 13->60 16 Ug4u4Y1VUIH.exe 13->16 injected process8 process9 18 unlodctr.exe 13 16->18         started        signatures10 38 Tries to steal Mail credentials (via file / registry access) 18->38 40 Tries to harvest and steal browser information (history, passwords, etc) 18->40 42 Modifies the context of a thread in another process (thread injection) 18->42 44 3 other signatures 18->44 21 2Lmi5oduU.exe 18->21 injected 24 firefox.exe 18->24         started        process11 dnsIp12 32 www.lonfor.website 67.223.117.189, 49732, 49733, 49734 VIMRO-AS15189US United States 21->32 34 www.sutbkn.info 47.83.1.90, 49728, 49729, 49730 VODANETInternationalIP-BackboneofVodafoneDE United States 21->34 36 4 other IPs or domains 21->36
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/543488926596ff1e2874b039ecfcbdbca619e49598111df0e7531c469de68cfe
Verdict:
Malware
YARA:
7 match(es)
Tags:
AutoIt Decompiled Executable PDB Path PE (Portable Executable) Suspect Win 32 Exe x86
Link:
https://app.malva.re/file/c4bd09c4c5db94450785bc5ac91b26b3
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/543488926596ff1e2874b039ecfcbdbca619e49598111df0e7531c469de68cfe/
Verdict:
Malicious
Threat:
Win32.Backdoor.FormBook
Link:
https://tip.neiki.dev/file/543488926596ff1e2874b039ecfcbdbca619e49598111df0e7531c469de68cfe
Threat name:
Win32.Backdoor.FormBook
Create hunting rule
Status:
Malicious
First seen:
2025-07-08 14:17:51 UTC
File Type:
PE (Exe)
Extracted files:
24
AV detection:
20 of 24 (83.33%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=kq2iretfs37r4kduwa46z7f5xstbtzevtair34hhkmoenhpgrt7a._file
Verdict:
malicious
Label(s):
unc_loader_036
Create hunting rule
autoit
Create hunting rule
Similar samples:
25903a945ab1f8a5e285227017e580b88efb235a746d138532c71182d3f8be08
Formbook
2acbdf309c44e9f358b7779eba49122eb5d4f7144148a17ebb9a32a5284850b6
Formbook
5942293d4ed06c7427d43524f4226be05ead22d7cb55ec2373fcb482fab62c4b
Formbook
+ 2'437 additional samples on MalwareBazaar
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook discovery rat spyware stealer trojan
Link:
https://tria.ge/reports/250709-nadvcsxvdx/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of WriteProcessMemory
Program crash
System Location Discovery: System Language Discovery
AutoIT Executable
Suspicious use of SetThreadContext
Formbook payload
Formbook
Formbook family
Verdict:
Malicious
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/4d039357-1a6e-4364-ab07-0424b0c2f634
Unpacked files
SH256 hash:
543488926596ff1e2874b039ecfcbdbca619e49598111df0e7531c469de68cfe
MD5 hash:
c4bd09c4c5db94450785bc5ac91b26b3
SHA1 hash:
b316aba50a83d55a40570ae700ea49948d5f04a6
Link:
https://www.unpac.me/results/b1784781-d9e4-460c-b4dd-416fad6b50ff/
SH256 hash:
cd071fff777d8e3ad7f9c0ec103716d0893e07ed6a52b55de03c0b0ef0d95f61
MD5 hash:
5115a17567e560dd843c06ab0cbfe7b8
SHA1 hash:
6e1e5887c47e35533f9d2c70335943d5dca53b01
Link:
https://www.unpac.me/results/b1784781-d9e4-460c-b4dd-416fad6b50ff/
SH256 hash:
71352303ab0b834caf8a4fc1a27404f442fa6e61a415b7c4385854c8a8ca26df
MD5 hash:
b1e864672708127dfd31730f8006f7e6
SHA1 hash:
71ebf08418c0a9e8b7790f8ce3a40281ef050da2
Detections:
win_formbook_g0
Create hunting rule
Link:
https://www.unpac.me/results/b1784781-d9e4-460c-b4dd-416fad6b50ff/
Parent samples :
25903a945ab1f8a5e285227017e580b88efb235a746d138532c71182d3f8be08
cf62b76c755a0e7c5ad6ab84014bc0f05494b4cf23c7816511558efbfd269b7e
2acbdf309c44e9f358b7779eba49122eb5d4f7144148a17ebb9a32a5284850b6
19478a15efa45981ccec619c3ebe95f31d3428e42f852d0165c801bad61ed239
5942293d4ed06c7427d43524f4226be05ead22d7cb55ec2373fcb482fab62c4b
214d448a792633cda80f61c6a00ff854b695a313e4de453b8771438cd1d9c794
cc0297cffdbbdb7f08626dda333d4191cb4db18c6dd82cfdaa90520f1ad0de7e
778109da1a12bb4e8399b82a898735a696ec02d31cf050b2d1a9f81dd25427b9
5d7e4ddddee4bd09d80d8a2c0bdfa47ab0d0065e5252e37bf133680f91f1d77f
37c433692490d7cded8c8bd3a0f8bc0cc688294a3d3116e859fa9e28483d5041
06be67d65eef8d5098e7ad60cc586d79a61874f4c4a2b80c654d96f97409593f
543488926596ff1e2874b039ecfcbdbca619e49598111df0e7531c469de68cfe
28fba79b770f7e72c3fcc66aa03497addc3f776f98c80ab1a0d67e90f5d57db0
0cd00b8cfd8e33bc63d7241811b7783f4b6e2896b4cd2b2f6a664bc0f52a7fa5
87eaa64d8a3c473be720385131aa24078c91b454054d1766b99aa5e0b2ea40a7
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Formbook
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/543488926596ff1e2874b039ecfcbdbca619e49598111df0e7531c469de68cfe

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: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: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: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: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: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

zip 628c71357656704c7557546de59aef2eeb4028999340e1a9c7adfd17ba2aa73e

Formbook

Executable exe 543488926596ff1e2874b039ecfcbdbca619e49598111df0e7531c469de68cfe

(this sample)

  
Delivery method
Other
  
Dropped by
SHA256 628c71357656704c7557546de59aef2eeb4028999340e1a9c7adfd17ba2aa73e
Cape
Cape
https://www.capesandbox.com/analysis/13668/
  
Dropped by
MD5 0581ced62b6254370bb8e816ccd8b4d6

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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