MalwareBazaar Database
You are currently viewing the MalwareBazaar entry for SHA256 4fcaa1b4bb8e2fc459e60db3cc8d9fd1df90cdaa4d165b66e771cd59573925f5. 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: 16
| SHA256 hash: | 4fcaa1b4bb8e2fc459e60db3cc8d9fd1df90cdaa4d165b66e771cd59573925f5 |
|---|---|
| SHA3-384 hash: | 08f619a012cb56d4acd846927ee1a4aef683f0f7b1a37bd26708eebc6c9b0bc1d2317210d9b751edc90f0d61090e6d82 |
| SHA1 hash: | 97d0871d6f34c888d4eef1d03c37b19bcad4281a |
| MD5 hash: | aab51d03a607bdbec19de45b0aa46da4 |
| humanhash: | foxtrot-autumn-foxtrot-romeo |
| File name: | 4fcaa1b4bb8e2fc459e60db3cc8d9fd1df90cdaa4d165b66e771cd59573925f5 |
| Download: | download sample |
| Signature | GuLoader |
| File size: | 547'232 bytes |
| First seen: | 2025-12-08 15:27:41 UTC |
| Last seen: | Never |
| File type: |  exe |
| MIME type: | application/x-dosexec |
| imphash | 1f23f452093b5c1ff091a2f9fb4fa3e9 (303 x GuLoader, 47 x AgentTesla, 47 x RemcosRAT) |
| ssdeep | 6144:0Iw3AmJRQqZkaQO9XrD1ZN4IAsd3y4uV1Q0E6fhVIM/ZTrkx5+r8JBD4i45PQbOh:BmTPN77bWq3yD1BPIM5kueai6QSnr6 |
| TLSH | T165C423001CB0D2A3D65E867A4AB116F26AB26E33A43147D747503D4DFA33A91ED5E33B |
| TrID | 47.3% (.EXE) Win32 Executable MS Visual C++ (generic) (31206/45/13) 15.9% (.EXE) Win64 Executable (generic) (10522/11/4) 9.9% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2) 7.6% (.EXE) Win16 NE executable (generic) (5038/12/1) 6.8% (.EXE) Win32 Executable (generic) (4504/4/1) |
| Magika | pebin |
| dhash icon | 31f1d0f01ccc1494 (2 x GuLoader) |
| Reporter |  adrian__luca |
| Tags: | exe GuLoader signed |
Code Signing Certificate
| Organisation: | Knappishly |
|---|---|
| Issuer: | Knappishly |
| Algorithm: | sha256WithRSAEncryption |
| Valid from: | 2025-11-14T06:52:46Z |
| Valid to: | 2026-11-14T06:52:46Z |
| Serial number: | 06cba01e78c03d327d3bcf44faf17d073516bfe9 |
| Thumbprint Algorithm: | SHA256 |
| Thumbprint: | 0142f000515cdb4c9a3bced9248ff0bc6ae258dad6bd0b08ad53853d25f7adfe |
| Source: | This information was brought to you by ReversingLabs A1000 Malware Analysis Platform |
Intelligence
File Origin
# of uploads :
1
# of downloads :
107
Origin country :
HUVendor Threat Intelligence
Malware configuration found for:
NSIS
Details
Malware family:
guloader
ID:
1
File name:
4fcaa1b4bb8e2fc459e60db3cc8d9fd1df90cdaa4d165b66e771cd59573925f5
Verdict:
Malicious activity
Analysis date:
2025-12-08 23:50:52 UTC
Tags:
guloader
Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
Guloader
Verdict:
Malicious
Score:
99.1%
Tags:
uloader virus nsis blic
Result
Verdict:
Malware
Maliciousness:
Behaviour
Creating a file in the %temp% directory
Creating a window
Searching for the window
Creating a 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
Verdict:
Malicious
File Type:
exe x32
First seen:
2025-11-21T04:12:00Z UTC
Last seen:
2025-12-10T01:13:00Z UTC
Hits:
~1000
Malware family:
Unlabeled
Verdict:
Unknown
Score:
98%
Verdict:
Malware
File Type:
PE
Verdict:
inconclusive
YARA:
5 match(es)
Tags:
Executable NSIS Installer PE (Portable Executable) PE File Layout Win 32 Exe x86
Threat name:
Win32.Trojan.Guloader
Status:
Suspicious
First seen:
2025-11-21 06:43:39 UTC
File Type:
PE (Exe)
Extracted files:
29
AV detection:
22 of 38 (57.89%)
Threat level:
5/5
Detection(s):
Suspicious file
Result
Malware family:
guloader
Score:
10/10
Tags:
family:guloader discovery downloader
Behaviour
Suspicious behavior: MapViewOfSection
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
System Location Discovery: System Language Discovery
Drops file in Windows directory
Suspicious use of NtSetInformationThreadHideFromDebugger
Loads dropped DLL
Guloader family
Guloader,Cloudeye
Verdict:
Suspicious
Tags:
n/a
YARA:
n/a
Unpacked files
SH256 hash:
4fcaa1b4bb8e2fc459e60db3cc8d9fd1df90cdaa4d165b66e771cd59573925f5
MD5 hash:
aab51d03a607bdbec19de45b0aa46da4
SHA1 hash:
97d0871d6f34c888d4eef1d03c37b19bcad4281a
SH256 hash:
f004c568d305cd95edbd704166fcd2849d395b595dff814bcc2012693527ac37
MD5 hash:
8b3830b9dbf87f84ddd3b26645fed3a0
SHA1 hash:
223bef1f19e644a610a0877d01eadc9e28299509
Malware family:
GuLoader
Verdict:
Malicious
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
0.72
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_detect_tls_callbacks |
|---|
| Rule name: | PE_Digital_Certificate |
|---|---|
| Author: | albertzsigovits |
| Rule name: | pe_no_import_table |
|---|---|
| Description: | Detect pe file that no import table |
File information
The table below shows additional information about this malware sample such as delivery method and external references.
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