MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 a23baf6242f0bb5b11356a4a1edd873856b3839658e0fe2e7d97464b0dd42072. 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: 10


Intelligence 10 IOCs YARA 3 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: a23baf6242f0bb5b11356a4a1edd873856b3839658e0fe2e7d97464b0dd42072
SHA3-384 hash: 290bb74fb7dce5fcc4f18510c4f1fa29ef80ab1b8be6d44b377330cc711d4ae125c143f6252d7a14cf11c6add6ecc489
SHA1 hash: 0545749524df422017b6d726ed8e12a40274b82d
MD5 hash: fe311d523aa3c945c8fcef2318fdc480
humanhash: apart-leopard-neptune-juliet
File name:Factuur Onbetaalde(Fac A213)pdf.exe
Download: download sample
Signature GuLoader
Create hunting rule
File size:1'218'048 bytes
First seen:2023-08-05 09:56:24 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash e9c0657252137ac61c1eeeba4c021000 (53 x GuLoader, 26 x RedLineStealer, 17 x AgentTesla)
ssdeep 24576:6gDjqojq68HiIG0qgCug5jOnMN9rFHZROL/wCxHrJ67dpe:lDjqoj1V2eHZc/wCxL2W
Threatray 1'003 similar samples on MalwareBazaar
TLSH T1A74533BB9C0064B7C281577018A7630ECAE7DFA14029EE6F5E99E50778C75807B1F39A
TrID 47.3% (.EXE) Win32 Executable MS Visual C++ (generic) (31206/45/13)
15.9% (.EXE) Win64 Executable (generic) (10523/12/4)
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) (4505/5/1)
File icon (PE):PE icon
dhash icon 388dd1ceba9acee6 (1 x GuLoader)
Reporter abuse_ch
Tags:exe GuLoader signed

Code Signing Certificate

Organisation:
Issuer:
Algorithm:sha256WithRSAEncryption
Valid from:2023-04-16T00:31:54Z
Valid to:2026-04-15T00:31:54Z
Serial number: 3d41c05662b4693a05c25fff368995c5fcf3ba37
Thumbprint Algorithm:SHA256
Thumbprint: b901c530a4248739ef981918ba259959110759d730fe9a50cbe48cd8c79d2e79
Source:This information was brought to you by ReversingLabs A1000 Malware Analysis Platform

Intelligence

File Origin
# of uploads :
1
# of downloads :
287
Origin country :
NL NL
Vendor Threat Intelligence
Malware family:
guloader
Create hunting rule
ID:
1
File name:
Factuur Onbetaalde(Fac A213)pdf.exe
Verdict:
Malicious activity
Analysis date:
2023-08-05 10:03:12 UTC
Tags:
guloader
Link:
https://app.any.run/tasks/a83426aa-273f-4c9c-8bf0-8ccffe97272d

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/440802/
Detection(s):
SecuriteInfo.com.MSIL.Kryptik.UGA.20041.UNOFFICIAL
Create hunting rule

Result
Verdict:
Clean
Maliciousness:

Behaviour
Creating a window
Creating a file in the %AppData% subdirectories
Creating a file in the %temp% subdirectories
Sending a custom TCP request
Delayed reading of the file
Gathering data
Verdict:
Malicious
Labled as:
Trojan.Generic
Link:
https://www.hybrid-analysis.com/sample/a23baf6242f0bb5b11356a4a1edd873856b3839658e0fe2e7d97464b0dd42072
Result
Verdict:
MALICIOUS
Details
Windows PE Executable
Found a Windows Portable Executable (PE) binary. Depending on context, the presence of a binary is suspicious or malicious.
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/bc2597d3-ae26-4ea4-b02e-880f160a8118
Result
Threat name:
GuLoader
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
72 / 100
Link:
https://www.joesandbox.com/analysis/1286433
Signature
Antivirus / Scanner detection for submitted sample
Multi AV Scanner detection for submitted file
Tries to detect Any.run
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Yara detected GuLoader
Behaviour
Behavior Graph:
Download SVG
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/a23baf6242f0bb5b11356a4a1edd873856b3839658e0fe2e7d97464b0dd42072/
Threat name:
Win32.Trojan.Guloader
Create hunting rule
Status:
Suspicious
First seen:
2023-08-03 08:23:04 UTC
File Type:
PE (Exe)
Extracted files:
6
AV detection:
20 of 38 (52.63%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=ui526ysc6c5vwejvnjfb5xmhhbllha4wldqp4lt5s5dewdouebza._file
Verdict:
malicious
Similar samples:
17acc02dc33a367af1141af2795f8138a2f856ba2a0e180c004d41c52f05b500
GuLoader
1d03f988e19d2663762d9eda11bce6fc85dedc4bfd488301bd1d76c1a1429ad2
GuLoader
22220e44323b331b37a0576b701085b7c53665aee96c6897920939ceecfcc5ad
GuLoader
23f6c24a5984c1bc1450f2d6eb32f3ece4e52bc275b4e9eea038db9f7f4f7717
GuLoader
38920e6f3a9c5908e9360388f0aa1f65b8e3df46849d758db7e1cdbf84727e3f
GuLoader
3bb5fb27d874f1c76a4934915a8c070fc70a9787414cdfeb3227680c92dc5eaf
GuLoader
4d688c6baec0d972c248f7747f18dc385e67a0fb2b1a5deb70f324b16220780d
GuLoader
5dd8324382a5bcea5859d89a259fc1fb3623f91fa720bc016b372ef2c87cae0c
GuLoader
a770fff46977ee8c18165f11b5346157fbd600f7971428edb46ef048ade479b4
GuLoader
f3100e1ff79518aafd23f706e705e0c0639c4d76cb42df14a73268ab78aac4e8
GuLoader
+ 993 additional samples on MalwareBazaar
Result
Malware family:
n/a
Score:
  7/10
Tags:
n/a
Link:
https://tria.ge/reports/230805-lyx7ssbc42/
Behaviour
Enumerates physical storage devices
Program crash
Drops file in Windows directory
Loads dropped DLL
Unpacked files
SH256 hash:
a23baf6242f0bb5b11356a4a1edd873856b3839658e0fe2e7d97464b0dd42072
MD5 hash:
fe311d523aa3c945c8fcef2318fdc480
SHA1 hash:
0545749524df422017b6d726ed8e12a40274b82d
Link:
https://www.unpac.me/results/7515976c-87e8-46ce-bf45-3dc60edb77f2/
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/a23baf6242f0bb5b11356a4a1edd873856b3839658e0fe2e7d97464b0dd42072

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:Ins_NSIS_Buer_Nov_2020_1
Create hunting rule
Author:Arkbird_SOLG
Description:Detect NSIS installer used for Buer loader
Rule name:PE_Digital_Certificate
Create hunting rule
Author:albertzsigovits
Rule name:PE_Potentially_Signed_Digital_Certificate
Create hunting rule
Author:albertzsigovits

File information

The table below shows additional information about this malware sample such as delivery method and external references.

Malspam

GuLoader

Executable exe a23baf6242f0bb5b11356a4a1edd873856b3839658e0fe2e7d97464b0dd42072

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/440802/

Comments