MalwareBazaar Database
You are currently viewing the MalwareBazaar entry for SHA256 f91a8ea10c20406a4d4ca6744ddce69f4dc93d49bcee2db6d8d20de0f78e764c. 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
| SHA256 hash: | f91a8ea10c20406a4d4ca6744ddce69f4dc93d49bcee2db6d8d20de0f78e764c |
|---|---|
| SHA3-384 hash: | 61c9d32afd333207a9ffe65856e446a14bde999e11bc681ef5b1f255ae4d6d1c5d0f6c1a4e2cb570210f97b132ee6014 |
| SHA1 hash: | 667b8f387f690acfacb351c369561e814eb38a0e |
| MD5 hash: | b8acbb63253a2d08dc3443da44622fce |
| humanhash: | skylark-eight-echo-one |
| File name: | f91a8ea10c20406a4d4ca6744ddce69f4dc93d49bcee2db6d8d20de0f78e764c |
| Download: | download sample |
| Signature | Formbook |
| File size: | 934'912 bytes |
| First seen: | 2026-06-08 08:27:32 UTC |
| Last seen: | Never |
| File type: |  exe |
| MIME type: | application/x-dosexec |
| imphash | f34d5f2d4577ed6d9ceec516c1f5a744 (49'066 x AgentTesla, 20'015 x Formbook, 12'352 x SnakeKeylogger) |
| ssdeep | 24576:OhwZtLtBA+aNyGU+N/pIuQqfarFYFGV2RJov/yojl:aw7tBAtDSrFYkv/yojl |
| Threatray | 157 similar samples on MalwareBazaar |
| TLSH | T11A150154221DDA1BE4A64FF40C32D2F417B45EE8A921D3038FEA7EEFB8763254955283 |
| TrID | 73.9% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13) 6.6% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2) 6.6% (.EXE) Win64 Executable (generic) (6522/11/2) 4.5% (.EXE) Win32 Executable (generic) (4504/4/1) 2.0% (.ICL) Windows Icons Library (generic) (2059/9) |
| Magika | pebin |
| Reporter |  adrian__luca |
| Tags: | exe FormBook |
Intelligence
File Origin
# of uploads :
1
# of downloads :
65
Origin country :
HUVendor Threat Intelligence
Malware configuration found for:
RoboSki
Details
Malware family:
n/a
ID:
1
File name:
_f91a8ea10c20406a4d4ca6744ddce69f4dc93d49bcee2db6d8d20de0f78e764c.exe
Verdict:
Malicious activity
Analysis date:
2026-06-08 08:28:55 UTC
Tags:
netreactor
Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
Formbook
Verdict:
Malicious
Score:
99.1%
Tags:
virus shell micro
Result
Verdict:
Malware
Maliciousness:
Behaviour
Creating a window
Creating a process with a hidden window
Unauthorized injection to a recently created process
Restart of the analyzed sample
Creating a file
Adding an exclusion to Microsoft Defender
Verdict:
Likely Malicious
Threat level:
7.5/10
Confidence:
100%
Tags:
packed vbnet
Verdict:
Malicious
Labled as:
Trojan.Generic
Verdict:
Malicious
File Type:
exe x32
First seen:
2026-05-21T06:43:00Z UTC
Last seen:
2026-06-10T04:55:00Z UTC
Hits:
~1000
Detections:
HEUR:Trojan-PSW.MSIL.Agensla.gen Trojan.Win32.SpeedBit.sb Trojan-Dropper.Win32.Injector.sb PDM:Trojan.Win32.Generic Trojan-Spy.Win32.Noon.sb Trojan.MSIL.Agent.sb Trojan-Spy.Noon.HTTP.ServerRequest Backdoor.Win32.Blakken.sb Trojan.Win32.Agent.sb Trojan.MSIL.Inject.sb Trojan.MSIL.Crypt.sb
Malware family:
Formbook
Verdict:
Malicious
Score:
100%
Verdict:
Malware
File Type:
PE
Gathering data
Detection:
formbook
Verdict:
Malicious
Threat:
Family.FORMBOOK
Threat name:
Win32.Backdoor.FormBook
Status:
Malicious
First seen:
2026-05-21 09:53:17 UTC
File Type:
PE (.Net Exe)
Extracted files:
7
AV detection:
26 of 36 (72.22%)
Threat level:
5/5
Detection(s):
Suspicious file
Verdict:
malicious
Label(s):
formbook
zgrat
Similar samples:
+ 147 additional samples on MalwareBazaar
Result
Malware family:
formbook
Score:
10/10
Tags:
family:formbook campaign:ge47 discovery execution rat spyware stealer trojan
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
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
Family: Formbook
Formbook payload
Unpacked files
SH256 hash:
f91a8ea10c20406a4d4ca6744ddce69f4dc93d49bcee2db6d8d20de0f78e764c
MD5 hash:
b8acbb63253a2d08dc3443da44622fce
SHA1 hash:
667b8f387f690acfacb351c369561e814eb38a0e
SH256 hash:
a0dc8eb3e7064786bc838d663bc13381d79c21d94e4b21e962df58038b3da8d5
MD5 hash:
0c14a9b90c173b418f7854a4b6c0869d
SHA1 hash:
6e6771594a2797a9e1128dbf1dd91adbb111c049
SH256 hash:
30b8da6a6c14adb7188e67f556e4e4abdc4e0a47db4008b7a2930c21dbdf59c2
MD5 hash:
c25420b73d0fe1dd63cf91b94c810225
SHA1 hash:
8d54643580d5d5952e74ec53ebf93b91e398e9de
SH256 hash:
76852271077e1d05e81d722ae61aa5d241e0e085fd5cc76be0b88809efc83434
MD5 hash:
f96135401c5ad28c6ded37a9ce55919b
SHA1 hash:
7bc7fdce333f5851ec83390b5b73c6811983d36e
Detections:
win_formbook_w0
win_formbook_g0
win_formbook_auto
FormBook
Malware family:
FormBook
Verdict:
Malicious
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
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 |
|---|---|
| Author: | malware-lu |
| Rule name: | NETexecutableMicrosoft |
|---|---|
| Author: | malware-lu |
| Rule name: | pe_imphash |
|---|
| Rule name: | Skystars_Malware_Imphash |
|---|---|
| Author: | Skystars LightDefender |
| Description: | imphash |
File information
The table below shows additional information about this malware sample such as delivery method and external references.
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