MalwareBazaar Database
You are currently viewing the MalwareBazaar entry for SHA256 a55b5e2ae0cba7d3a9f1bd2b21a930c3e221c1710cef08aa2351f7fa183ae1d8. 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: 13
| SHA256 hash: | a55b5e2ae0cba7d3a9f1bd2b21a930c3e221c1710cef08aa2351f7fa183ae1d8 |
|---|---|
| SHA3-384 hash: | a3dcc26626bfde255171b210cf97ded0bfdf18323b5de119248eac2d6a0661c34c1fb62396f94be7a1e17fc01b813489 |
| SHA1 hash: | 6b8ee08ae0aa9209a3182276993dd335dc58b1e4 |
| MD5 hash: | 180e1a19f9e0c1c999d6cb3ca9c70c93 |
| humanhash: | stream-quebec-delta-indigo |
| File name: | a55b5e2ae0cba7d3a9f1bd2b21a930c3e221c1710cef08aa2351f7fa183ae1d8 |
| Download: | download sample |
| Signature | GuLoader |
| File size: | 1'029'288 bytes |
| First seen: | 2026-03-06 14:45:08 UTC |
| Last seen: | Never |
| File type: |  exe |
| MIME type: | application/x-dosexec |
| imphash | f4639a0b3116c2cfc71144b88a929cfd (144 x GuLoader, 57 x Formbook, 46 x VIPKeylogger) |
| ssdeep | 24576:kfLGzkcZfAvLsGLe3vbtZWrlk5b8KIJ4LUwv/GOFlmuxqfyA:+JyfAIGL2znWBk5b85aXv+kmzj |
| Threatray | 2'492 similar samples on MalwareBazaar |
| TLSH | T16E252321D3D8EA08E4D01A355928ABF2CEB79C51148052870729FF6F7B37AF6616F217 |
| 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 |
| dhash icon | d022d8c8f28f80c0 (44 x GuLoader, 12 x VIPKeylogger, 7 x Formbook) |
| Reporter |  adrian__luca |
| Tags: | exe GuLoader signed |
Code Signing Certificate
| Organisation: | Dispersionerne |
|---|---|
| Issuer: | Dispersionerne |
| Algorithm: | sha256WithRSAEncryption |
| Valid from: | 2025-12-26T02:38:07Z |
| Valid to: | 2026-12-26T02:38:07Z |
| Serial number: | 1bb3877b1b2945a14fb53a8596c616bb0a3fa8c7 |
| Thumbprint Algorithm: | SHA256 |
| Thumbprint: | 46e50640843b79372c4b0e594de3c3396f26eeebc382f87d1832040f3ad77cc1 |
| Source: | This information was brought to you by ReversingLabs A1000 Malware Analysis Platform |
Intelligence
File Origin
# of uploads :
1
# of downloads :
124
Origin country :
HUVendor Threat Intelligence
Malware family:
formbook
ID:
1
File name:
a55b5e2ae0cba7d3a9f1bd2b21a930c3e221c1710cef08aa2351f7fa183ae1d8
Verdict:
Malicious activity
Analysis date:
2026-03-06 15:11:59 UTC
Tags:
formbook xloader
Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
n/a
Verdict:
Malicious
Score:
70%
Tags:
injection obfusc crypt
Verdict:
Malicious
File Type:
exe x32
First seen:
2026-02-12T09:03:00Z UTC
Last seen:
2026-02-13T17:33:00Z UTC
Hits:
~1000
Verdict:
Unknown
Score:
96%
Verdict:
Malware
File Type:
PE
Gathering data
Threat name:
Win32.Trojan.Leonem
Status:
Malicious
First seen:
2026-02-12 17:56:01 UTC
File Type:
PE (Exe)
Extracted files:
17
AV detection:
20 of 36 (55.56%)
Threat level:
5/5
Detection(s):
Malicious file
Verdict:
malicious
Label(s):
cloudeye
Similar samples:
+ 2'482 additional samples on MalwareBazaar
Result
Malware family:
formbook
Score:
10/10
Tags:
family:formbook discovery rat spyware stealer trojan
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Program crash
System Location Discovery: System Language Discovery
Drops file in Windows directory
Suspicious use of NtCreateThreadExHideFromDebugger
Suspicious use of NtSetInformationThreadHideFromDebugger
Contacts third-party web service commonly abused for C2
Loads dropped DLL
Formbook payload
Formbook
Formbook family
Unpacked files
SH256 hash:
a55b5e2ae0cba7d3a9f1bd2b21a930c3e221c1710cef08aa2351f7fa183ae1d8
MD5 hash:
180e1a19f9e0c1c999d6cb3ca9c70c93
SHA1 hash:
6b8ee08ae0aa9209a3182276993dd335dc58b1e4
SH256 hash:
9111099efe9d5c9b391dc132b2faf0a3851a760d4106d5368e30ac744eb42706
MD5 hash:
4add245d4ba34b04f213409bfe504c07
SHA1 hash:
ef756d6581d70e87d58cc4982e3f4d18e0ea5b09
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:
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: | DebuggerCheck__API |
|---|---|
| Reference: | https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara |
| Rule name: | DetectEncryptedVariants |
|---|---|
| Author: | Zinyth |
| Description: | Detects 'encrypted' in ASCII, Unicode, base64, or hex-encoded |
| Rule name: | Detect_NSIS_Nullsoft_Installer |
|---|---|
| Author: | Obscurity Labs LLC |
| Description: | Detects NSIS installers by .ndata section + NSIS header string |
| Rule name: | golang_bin_JCorn_CSC846 |
|---|---|
| Author: | Justin Cornwell |
| Description: | CSC-846 Golang detection ruleset |
| 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 |
| Rule name: | Sus_CMD_Powershell_Usage |
|---|---|
| Author: | XiAnzheng |
| Description: | May Contain(Obfuscated or no) Powershell or CMD Command that can be abused by threat actor(can create FP) |
| Rule name: | telebot_framework |
|---|---|
| Author: | vietdx.mb |
File information
The table below shows additional information about this malware sample such as delivery method and external references.
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