MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 ac131e3fbcd040f4a5f0dc8e90d3c77bb98d934d5c6696de510ca89f18599062. 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: 12


Intelligence 12 IOCs YARA 2 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: ac131e3fbcd040f4a5f0dc8e90d3c77bb98d934d5c6696de510ca89f18599062
SHA3-384 hash: 38711b0494064f26e2cbde5cf373478c952a3870c06fa4efb7bf07fe96ab5c1a8b502c9ca6f04d829067926208e4d8bf
SHA1 hash: 2d7ba957be6c89cd3633a63dfd8e925a90d40bd4
MD5 hash: 08defe80ace1f032875c8127ae5e4481
humanhash: fish-wisconsin-neptune-tango
File name:08defe80ace1f032875c8127ae5e4481.exe
Download: download sample
Signature GuLoader
Create hunting rule
File size:385'144 bytes
First seen:2023-08-02 17:50:04 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash b78ecf47c0a3e24a6f4af114e2d1f5de (304 x GuLoader, 23 x Formbook, 21 x RemcosRAT)
ssdeep 6144:3BebKFxUGBNC3Iu5gro6xBcbKiydMdh5BwprYXUdOTDuCUkJf1dqDQrFGCf:4KFxc3Iu5g86xKbUdOmrUUdmuROOkrF5
TLSH T13584CE16199F587FCC81AB70797FC20582EF7E91FE05B5F5410A6A0BE83D1EE0A4A4C9
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 d679cc969e99d32b (2 x GuLoader)
Reporter abuse_ch
Tags:exe GuLoader signed

Code Signing Certificate

Organisation:
Issuer:
Algorithm:sha256WithRSAEncryption
Valid from:2022-08-08T01:31:14Z
Valid to:2025-08-07T01:31:14Z
Serial number: 55e223524583ff09cf32f534eb1809bbe23a3514
Thumbprint Algorithm:SHA256
Thumbprint: 90b6db172732ec8430be9cabf2e5956f156f7bbf0342b6fb404f461092284582
Source:This information was brought to you by ReversingLabs A1000 Malware Analysis Platform

Intelligence

File Origin
# of uploads :
1
# of downloads :
276
Origin country :
NL NL
Vendor Threat Intelligence
Malware family:
guloader
Create hunting rule
ID:
1
File name:
Draft Purchase Order.xls
Verdict:
Malicious activity
Analysis date:
2023-08-02 08:52:08 UTC
Tags:
exploit cve-2017-11882 opendir loader guloader
Link:
https://app.any.run/tasks/5e3b120c-c06f-46f8-9823-b61cdfd8295d

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/439906/
Detection(s):
SecuriteInfo.com.Mal.Generic-S.31020.16397.20236.UNOFFICIAL
Create hunting rule

Result
Verdict:
Clean
Maliciousness:

Behaviour
Searching for the window
Creating a window
Creating a file in the %AppData% subdirectories
Creating a file in the %temp% subdirectories
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
control lolbin overlay packed shell32
Link:
https://www.filescan.io/uploads/64ca9786539838c2be51e8ac/reports/c03fce3c-5b95-4a47-95c9-bc53bebdc281/overview
Verdict:
Malicious
Labled as:
Win/malicious_confidence_70%
Link:
https://www.hybrid-analysis.com/sample/ac131e3fbcd040f4a5f0dc8e90d3c77bb98d934d5c6696de510ca89f18599062
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/654ace41-8fb3-45ed-94ad-941c7b98ced0
Result
Threat name:
GuLoader, FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1284625
Signature
Antivirus detection for URL or domain
C2 URLs / IPs found in malware configuration
Found malware configuration
Malicious sample detected (through community Yara rule)
Maps a DLL or memory area into another process
Modifies the context of a thread in another process (thread injection)
Modifies the prolog of user mode functions (user mode inline hooks)
Multi AV Scanner detection for submitted file
Performs DNS queries to domains with low reputation
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Snort IDS alert for network traffic
System process connects to network (likely due to code injection or exploit)
Tries to detect Any.run
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Uses netstat to query active network connections and open ports
Yara detected FormBook
Yara detected GuLoader
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1284625 Sample: wLlREXsA9M.exe Startdate: 02/08/2023 Architecture: WINDOWS Score: 100 34 xqw1666688.top 2->34 36 www.zbjcolwy.cfd 2->36 38 25 other IPs or domains 2->38 56 Snort IDS alert for network traffic 2->56 58 Found malware configuration 2->58 60 Malicious sample detected (through community Yara rule) 2->60 62 8 other signatures 2->62 11 wLlREXsA9M.exe 29 2->11         started        signatures3 process4 file5 32 C:\Users\user\AppData\Local\...\System.dll, PE32 11->32 dropped 72 Tries to detect Any.run 11->72 15 wLlREXsA9M.exe 6 11->15         started        signatures6 process7 dnsIp8 46 198.46.176.189, 49842, 80 AS-COLOCROSSINGUS United States 15->46 48 Modifies the context of a thread in another process (thread injection) 15->48 50 Tries to detect Any.run 15->50 52 Maps a DLL or memory area into another process 15->52 54 2 other signatures 15->54 19 explorer.exe 4 1 15->19 injected signatures9 process10 dnsIp11 40 lilith-con.com 185.238.87.6, 49881, 80 WIBERES Spain 19->40 42 cacciatoridiofferte.com 195.110.124.133, 49889, 80 REGISTER-ASIT Italy 19->42 44 16 other IPs or domains 19->44 64 System process connects to network (likely due to code injection or exploit) 19->64 66 Uses netstat to query active network connections and open ports 19->66 23 NETSTAT.EXE 19->23         started        26 autochk.exe 19->26         started        signatures12 process13 signatures14 68 Modifies the context of a thread in another process (thread injection) 23->68 70 Maps a DLL or memory area into another process 23->70 28 cmd.exe 1 23->28         started        process15 process16 30 conhost.exe 28->30         started       
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/ac131e3fbcd040f4a5f0dc8e90d3c77bb98d934d5c6696de510ca89f18599062/
Threat name:
Win32.Trojan.GuLoader
Create hunting rule
Status:
Malicious
First seen:
2023-08-02 12:25:56 UTC
File Type:
PE (Exe)
Extracted files:
4
AV detection:
17 of 23 (73.91%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=vqjr4p542bapjjpq3shjbu6hpo4y3e2nlrtjnxsrbsuj6gczsbra._file
Verdict:
malicious
Label(s):
cloudeye
Create hunting rule
Result
Malware family:
guloader
Create hunting rule
Score:
  10/10
Tags:
family:guloader downloader
Link:
https://tria.ge/reports/230802-we5gwahe8t/
Behaviour
Enumerates physical storage devices
Loads dropped DLL
Guloader,Cloudeye
Unpacked files
SH256 hash:
fa4ab1d6f79fd677433a31ada7806373a789d34328da46ccb0449bbf347bd73e
MD5 hash:
3f176d1ee13b0d7d6bd92e1c7a0b9bae
SHA1 hash:
fe582246792774c2c9dd15639ffa0aca90d6fd0b
Link:
https://www.unpac.me/results/164dbe9a-9af2-4a96-a545-b2bcbba4e369/
SH256 hash:
ac131e3fbcd040f4a5f0dc8e90d3c77bb98d934d5c6696de510ca89f18599062
MD5 hash:
08defe80ace1f032875c8127ae5e4481
SHA1 hash:
2d7ba957be6c89cd3633a63dfd8e925a90d40bd4
Link:
https://www.unpac.me/results/164dbe9a-9af2-4a96-a545-b2bcbba4e369/
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Suspicious File
Score:
0.54
Link:
https://yomi.yoroi.company/submissions/ac131e3fbcd040f4a5f0dc8e90d3c77bb98d934d5c6696de510ca89f18599062

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

File information

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

Web download

GuLoader

Executable exe ac131e3fbcd040f4a5f0dc8e90d3c77bb98d934d5c6696de510ca89f18599062

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/2695835/
  
Delivery method
Distributed via web download
Cape
Cape
https://www.capesandbox.com/analysis/439906/

Comments