MalwareBazaar Database
You are currently viewing the MalwareBazaar entry for SHA256 d538f52e0703db623fcc880f8adf16f96459eaef867e5b91e91740343726e913. 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: 10
| SHA256 hash: | d538f52e0703db623fcc880f8adf16f96459eaef867e5b91e91740343726e913 |
|---|---|
| SHA3-384 hash: | 9705d94d6fce63d3292649f3ca36ca2c977173634727f32f06829127bbb0558197eec0143dcfd4a5aee6f0470c5b4544 |
| SHA1 hash: | c02ad81f0e0eae82164a29ea570ba37cd2031a7c |
| MD5 hash: | 60c7b6ad0214681bf65f3ee2b55fcb3a |
| humanhash: | minnesota-solar-artist-idaho |
| File name: | 261F0000723-00042F.261F0000723-00042F.PDF.exe |
| Download: | download sample |
| Signature | Formbook |
| File size: | 435'672 bytes |
| First seen: | 2026-10-07 14:53:42 UTC |
| Last seen: | Never |
| File type: |  exe |
| MIME type: | application/vnd.microsoft.portable-executable |
| imphash | 9be4f90f50c714bc00cc8beb2e137299 (7 x RemcosRAT, 6 x Formbook, 2 x ValleyRAT) |
| ssdeep | 6144:OJTKDxQFe3nha7g+2WYDHVzi54SRB4uij5KDVOJeMKCvVFgZNU/MIGSYbb:Otg/3Un8zi540B5A8MzFgZm7GSYn |
| TLSH | T12094F100EE869CEDC5E1C57149B696B2E8327DDD4824E21F57187EABBD319B0D93A303 |
| TrID | 27.0% (.EXE) Win64 Executable (generic) (6522/11/2) 20.8% (.EXE) Win16 NE executable (generic) (5038/12/1) 18.6% (.EXE) Win32 Executable (generic) (4504/4/1) 8.5% (.ICL) Windows Icons Library (generic) (2059/9) 8.4% (.EXE) OS/2 Executable (generic) (2029/13) |
| Magika | pebin |
| dhash icon | d022d8c8f28f80c0 (44 x GuLoader, 12 x VIPKeylogger, 9 x Formbook) |
| Reporter |  lowmal3 |
| Tags: | exe FormBook signed |
Code Signing Certificate
| Organisation: | Philobiblist |
|---|---|
| Issuer: | Philobiblist |
| Algorithm: | sha256WithRSAEncryption |
| Valid from: | 2026-09-30T00:25:55Z |
| Valid to: | 2027-09-30T00:25:55Z |
| Serial number: | 367c86f8fbc3c403394a9f6a9e64cdad58c8bacc |
| Thumbprint Algorithm: | SHA256 |
| Thumbprint: | 4d0263fccaeb14e595d56a4b12f5054d50c4984015399b55895fe20137c0c1f5 |
| Source: | This information was brought to you by ReversingLabs A1000 Malware Analysis Platform |
Intelligence
File Origin
# of uploads :
1
# of downloads :
195
Origin country :
DEVendor Threat Intelligence
Malware configuration found for:
NSIS
Details
Malware family:
n/a
ID:
1
File name:
261F0000723-00042F.261F0000723-00042F.PDF.exe
Verdict:
Malicious activity
Analysis date:
2026-10-07 14:06:52 UTC
Tags:
n/a
Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
n/a
Detection(s):
Result
Verdict:
Malware
Maliciousness:
Behaviour
Creating a file in the %temp% directory
Creating a window
Creating a file
Delayed reading of the file
Unauthorized injection to a recently created process
Restart of the analyzed sample
DNS request
Connection attempt
Sending a custom TCP request
Sending an HTTP GET request
Сreating synchronization primitives
Unauthorized injection to a system process
Verdict:
Suspicious
Threat level:
5/10
Confidence:
100%
Tags:
adaptive-context anti-debug fingerprint installer installer installer-heuristic masquerade nsis packed reconnaissance signed
Verdict:
Malicious
Labled as:
Downloader.Minix
Verdict:
Malicious
File Type:
exe x64
First seen:
2026-10-07T05:26:00Z UTC
Last seen:
2026-10-08T12:07:00Z UTC
Hits:
~10000
Verdict:
Unknown
Result
Threat name:
FormBook
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Signature
AI detected suspicious PE / MSI digital signature
Antivirus detection for URL or domain
Creates a thread in another existing process (thread injection)
Found direct / indirect Syscall (likely to bypass EDR)
Hides threads from debuggers
Initial sample is a PE file and has a suspicious name
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)
Sigma detected: Rundll32 Execution Without CommandLine Parameters
Sigma detected: Suspicious Double Extension File Execution
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)
Unusual module load detection (module proxying)
Yara detected FormBook
Behaviour
Behavior Graph:
Score:
91%
Verdict:
Malware
File Type:
PE
Verdict:
inconclusive
YARA:
5 match(es)
Tags:
Executable NSIS Installer PE (Portable Executable) PE File Layout Win 64 Exe x64
Detection(s):
Suspicious file
Result
Malware family:
n/a
Score:
7/10
Tags:
defense_evasion discovery privilege_escalation
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of FindShellTrayWindow
Suspicious use of SendNotifyMessage
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Reads the TCP/IP host and domain name from the registry
Drops file in Program Files directory
Suspicious use of NtSetInformationThreadHideFromDebugger
Contacts third-party web service commonly abused for C2
Loads dropped DLL
Unpacked files
SH256 hash:
d538f52e0703db623fcc880f8adf16f96459eaef867e5b91e91740343726e913
MD5 hash:
60c7b6ad0214681bf65f3ee2b55fcb3a
SHA1 hash:
c02ad81f0e0eae82164a29ea570ba37cd2031a7c
SH256 hash:
a0a6431feb4e09018d99acdc02f2139fbacd68420b0f84d4b22a9e091aaac707
MD5 hash:
48452d7f73a0e73b62a16b4c88068a60
SHA1 hash:
ef5a3edd25cf3cf664e93c38fbe9034ce652d117
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: | Detect_NSIS_Nullsoft_Installer |
|---|---|
| Author: | Obscurity Labs LLC |
| Description: | Detects NSIS installers by .ndata section + NSIS header string |
| Rule name: | PE_Digital_Certificate |
|---|---|
| Author: | albertzsigovits |
| Rule name: | VECT_Ransomware |
|---|---|
| Author: | Mustafa Bakhit |
| Description: | Detects activity associated with VECT ransomware. This includes registry modifications and deletions, execution of system and defense-evasion commands, suspicious API usage, mutex creation, file and memory manipulation, ransomware note generation, anti-debugging and anti-analysis techniques, and embedded cryptographic constants (SHA256) characteristic of this malware family. Designed for threat intelligence and malware detection environments. |
| Rule name: | Win_Clipboard_Clipper_Thengavar |
|---|---|
| Author: | Thengavar |
| Description: | Detects malware manipulating the Windows clipboard for clipping or crypto stealing attacks |
| Rule name: | WIN_Malware_Formbook_ForgeAuto_dc5021a0 |
|---|---|
| Author: | Marjoriefort |
| Description: | Detects Formbook (pe, etat binaire) |
File information
The table below shows additional information about this malware sample such as delivery method and external references.
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