MalwareBazaar Database
You are currently viewing the MalwareBazaar entry for SHA256 b99e00a3217634f918e586818a51d7cc409e71deee345727f9dbb9450d3ba7fc. 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
GuLoader
Vendor detections: 8
| SHA256 hash: | b99e00a3217634f918e586818a51d7cc409e71deee345727f9dbb9450d3ba7fc |
|---|---|
| SHA3-384 hash: | 6f8ebcb96217f5d9699f07bf90fc16c90aebda788b78963bdb10018ee9a90773eadec1f7ea1afcd10c4c698ab386dd39 |
| SHA1 hash: | 575cf09531a7328626f6ccfdbe3565f7dfbb93c5 |
| MD5 hash: | 57d1675f67e36a1345cfdfd7360952ef |
| humanhash: | california-edward-tennessee-princess |
| File name: | b99e00a3217634f918e586818a51d7cc409e71deee345727f9dbb9450d3ba7fc |
| Download: | download sample |
| Signature | GuLoader |
| File size: | 415'176 bytes |
| First seen: | 2026-08-10 13:44:59 UTC |
| Last seen: | Never |
| File type: |  exe |
| MIME type: | application/x-dosexec |
| imphash | 46ce5c12b293febbeb513b196aa7f843 (45 x GuLoader, 21 x RemcosRAT, 15 x AgentTesla) |
| ssdeep | 12288:BX4nKSZ3LzY/YVA5VvBl/Icqcodqwl+iIBwix9a:B4nKSZbzY/EmVzImo8MEwixA |
| TLSH | T103941261A3F4C453C93A4A30E8BF99F19FADEC64C691864B6308BF5D7D373524D1A222 |
| TrID | 50.3% (.EXE) Win32 Executable MS Visual C++ (generic) (31206/45/13) 10.6% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2) 10.5% (.EXE) Win64 Executable (generic) (6522/11/2) 8.1% (.EXE) Win16 NE executable (generic) (5038/12/1) 7.2% (.EXE) Win32 Executable (generic) (4504/4/1) |
| Magika | pebin |
| Reporter |  adrian__luca |
| Tags: | exe GuLoader signed |
Code Signing Certificate
| Organisation: | Fogedretter |
|---|---|
| Issuer: | Fogedretter |
| Algorithm: | sha256WithRSAEncryption |
| Valid from: | 2026-05-21T05:15:35Z |
| Valid to: | 2027-05-21T05:15:35Z |
| Serial number: | 170a08dae66cc2f34487618fc47643e58d06e9a3 |
| Thumbprint Algorithm: | SHA256 |
| Thumbprint: | 636d925790c1503888bfba94ac6fd8d744b9c2aa8061c82742cc4d28722da052 |
| Source: | This information was brought to you by ReversingLabs A1000 Malware Analysis Platform |
Intelligence
File Origin
# of uploads :
1
# of downloads :
70
Origin country :
HUVendor Threat Intelligence
Malware configuration found for:
GuLoader
NSIS
Details
Detection:
n/a
Result
Verdict:
Clean
Maliciousness:
Behaviour
Creating a file in the %temp% directory
Creating a window
Searching for the window
Creating a file
Delayed reading of the file
Restart of the analyzed sample
Verdict:
Likely Malicious
Threat level:
7.5/10
Confidence:
100%
Tags:
adaptive-context anti-debug fingerprint installer installer installer-heuristic microsoft_visual_cc nsis reconnaissance signed
Verdict:
Malicious
File Type:
exe x32
First seen:
2026-07-06T03:34:00Z UTC
Last seen:
2026-08-10T07:23:00Z UTC
Hits:
~1000
Verdict:
Suspicious
Score:
86%
Verdict:
Malware
File Type:
PE
Gathering data
Threat name:
Win32.Malware.Heuristic
Status:
Malicious
First seen:
2026-07-06 06:34:35 UTC
File Type:
PE (Exe)
Extracted files:
17
AV detection:
15 of 24 (62.50%)
Threat level:
2/5
Detection(s):
Suspicious file
Verdict:
malicious
Label(s):
CloudEyE
Result
Malware family:
n/a
Score:
7/10
Tags:
discovery
Behaviour
Suspicious behavior: MapViewOfSection
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
System Location Discovery: System Language Discovery
Drops file in Program Files directory
Drops file in Windows directory
Suspicious use of NtSetInformationThreadHideFromDebugger
Loads dropped DLL
Unpacked files
SH256 hash:
b99e00a3217634f918e586818a51d7cc409e71deee345727f9dbb9450d3ba7fc
MD5 hash:
57d1675f67e36a1345cfdfd7360952ef
SHA1 hash:
575cf09531a7328626f6ccfdbe3565f7dfbb93c5
SH256 hash:
b1350f487692057c8ffde75dcc55287a52a3272240d4d4912f24464b27551fc0
MD5 hash:
8f0e7415f33843431df308bb8e06af81
SHA1 hash:
1314272e6ad3be1985d4a1607b890a34b0bde8b5
SH256 hash:
8b4c47c4cf5e76ec57dd5a050d5acd832a0d532ee875d7b44f6cdaf68f90d37c
MD5 hash:
9b38a1b07a0ebc5c7e59e63346ecc2db
SHA1 hash:
97332a2ffcf12a3e3f27e7c05213b5d7faa13735
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Suspicious File
Score:
0.34
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: | NSIS |
|---|---|
| Author: | kevoreilly |
| Description: | NSIS Integrity Check function |
| 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. |
File information
The table below shows additional information about this malware sample such as delivery method and external references.
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