MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b3a1509f77da1f09f79e2d0d6b6c6938db01f8ec67fa6adcf992eeb5b6b8698a. 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: 14


Intelligence 14 IOCs YARA 3 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: b3a1509f77da1f09f79e2d0d6b6c6938db01f8ec67fa6adcf992eeb5b6b8698a
SHA3-384 hash: cab82170979ead46ca0127eefce82cc38dd6b5722408bea25cfc11f01d12d40c2f4fef4bc0c917a5e0734ef0f4e6b6b9
SHA1 hash: 04dd7b20c6ed955f23a745b18a6cf3ffdd1a6f94
MD5 hash: cdd187b140f787efa951fab18d274cfc
humanhash: iowa-carbon-uncle-texas
File name:ANALYSE Nr. AR001-pdf.exe
Download: download sample
Signature GuLoader
Create hunting rule
File size:313'464 bytes
First seen:2023-06-13 07:52:16 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash 3abe302b6d9a1256e6a915429af4ffd2 (271 x GuLoader, 38 x Formbook, 25 x Loki)
ssdeep 6144:ux4vyP05yb7EuugWVZ+oYZ4X8Ivo2K+9OzYoAG94FGiVU1xiZc0I/sO:Y4dcTbsYoYZ4X8IvoL+9OzYoAG94gW2f
TLSH T14C64125263A0ED37EA060230C0369EF25AA54E15EA507B531BA47F0E7E7E391473A35F
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)
Reporter lowmal3
Tags:exe GuLoader signed

Code Signing Certificate

Organisation:
Issuer:
Algorithm:sha256WithRSAEncryption
Valid from:2023-04-05T03:08:26Z
Valid to:2026-04-04T03:08:26Z
Serial number: 1392569ae0c2fc270a518e9ed1104191f99c6db6
Thumbprint Algorithm:SHA256
Thumbprint: ab2242c6eaab446c82e6982225b8d74c66811452ebc3f1048e011d61b874b59e
Source:This information was brought to you by ReversingLabs A1000 Malware Analysis Platform

Intelligence

File Origin
# of uploads :
1
# of downloads :
280
Origin country :
DE DE
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
ANALYSE Nr. AR001-pdf.exe
Verdict:
Malicious activity
Analysis date:
2023-06-13 07:54:42 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/82d1b1da-4f29-4646-8fdd-136dcc648036

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/398151/
Detection(s):
PUA.Win.Packer.Pequake-4
Create hunting rule

SecuriteInfo.com.BackDoor.HRDP.38.4359.6678.UNOFFICIAL
Create hunting rule

Result
Verdict:
Suspicious
Maliciousness:

Behaviour
Creating a window
Creating a file in the %AppData% subdirectories
Delayed reading of the file
Creating a file in the %temp% subdirectories
Searching for the window
Searching for the Windows task manager window
Running batch commands
Creating a process with a hidden window
Result
Malware family:
n/a
Score:
  5/10
Tags:
n/a
Link:
https://dragonfly.certego.net/analysis/90415/overview
Behaviour
MalwareBazaar
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
buer guloader lolbin overlay packed shell32.dll
Link:
https://www.filescan.io/uploads/6488205fc6414862d206cff0/reports/87a8da71-c0e5-4815-a5b5-0e772db74346/overview
Verdict:
Malicious
Labled as:
Malware
Link:
https://www.hybrid-analysis.com/sample/b3a1509f77da1f09f79e2d0d6b6c6938db01f8ec67fa6adcf992eeb5b6b8698a
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/7739bde0-8a61-43bc-b14e-402beca5c4f4
Result
Threat name:
GuLoader, AgentTesla
Create hunting rule
Detection:
malicious
Classification:
troj.evad.spyw
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1253427
Signature
Mass process execution to delay analysis
Multi AV Scanner detection for submitted file
Obfuscated command line found
Queries sensitive network adapter information (via WMI, Win32_NetworkAdapter, often done to detect virtual machines)
Tries to detect Any.run
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Tries to harvest and steal browser information (history, passwords, etc)
Tries to harvest and steal Putty / WinSCP information (sessions, passwords, etc)
Tries to steal Mail credentials (via file / registry access)
Writes to foreign memory regions
Yara detected AgentTesla
Yara detected GuLoader
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 886447 Sample: ANALYSE_Nr._AR001-pdf.exe Startdate: 13/06/2023 Architecture: WINDOWS Score: 100 42 mehanotehna.hr 2->42 46 Multi AV Scanner detection for submitted file 2->46 48 Yara detected GuLoader 2->48 50 Yara detected AgentTesla 2->50 52 Tries to detect sandboxes and other dynamic analysis tools (process name or module or function) 2->52 8 ANALYSE_Nr._AR001-pdf.exe 6 48 2->8         started        signatures3 process4 file5 36 C:\Users\user\AppData\Roaming\...\KARAOKE.DLL, PE32 8->36 dropped 38 C:\Users\user\AppData\Local\...\nsExec.dll, PE32 8->38 dropped 40 C:\Users\user\AppData\Local\...\System.dll, PE32 8->40 dropped 54 Obfuscated command line found 8->54 56 Writes to foreign memory regions 8->56 58 Mass process execution to delay analysis 8->58 60 Tries to detect Any.run 8->60 12 CasPol.exe 11 8->12         started        16 cmd.exe 8->16         started        18 cmd.exe 8->18         started        20 62 other processes 8->20 signatures6 process7 dnsIp8 44 mehanotehna.hr 178.218.173.4, 49938, 80 SEDMIODJEL-ASHR Croatia (LOCAL Name: Hrvatska) 12->44 62 Tries to harvest and steal Putty / WinSCP information (sessions, passwords, etc) 12->62 64 Queries sensitive network adapter information (via WMI, Win32_NetworkAdapter, often done to detect virtual machines) 12->64 66 Tries to steal Mail credentials (via file / registry access) 12->66 68 2 other signatures 12->68 22 conhost.exe 12->22         started        24 Conhost.exe 16->24         started        26 Conhost.exe 18->26         started        28 Conhost.exe 20->28         started        30 Conhost.exe 20->30         started        32 Conhost.exe 20->32         started        34 59 other processes 20->34 signatures9 process10
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/b3a1509f77da1f09f79e2d0d6b6c6938db01f8ec67fa6adcf992eeb5b6b8698a/
Threat name:
Win32.Trojan.GuLoader
Create hunting rule
Status:
Malicious
First seen:
2023-06-13 07:53:06 UTC
File Type:
PE (Exe)
Extracted files:
8
AV detection:
17 of 24 (70.83%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=woqvbh3x3ipqt546fugww3djhdnqd6hmm75gvxhzslxllnvyngfa._file
Result
Malware family:
agenttesla
Create hunting rule
Score:
  10/10
Tags:
family:agenttesla collection keylogger spyware stealer trojan
Link:
https://tria.ge/reports/230613-jqy31sfd84/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
outlook_office_path
outlook_win_path
Enumerates physical storage devices
Suspicious use of NtCreateThreadExHideFromDebugger
Suspicious use of NtSetInformationThreadHideFromDebugger
Suspicious use of SetThreadContext
Accesses Microsoft Outlook profiles
Checks QEMU agent file
Loads dropped DLL
AgentTesla
Unpacked files
SH256 hash:
e7b145abc7c519e6bd91dc06b7b83d1e73735ac1ac37d30a7889840a6eed38fc
MD5 hash:
50ba20cad29399e2db9fa75a1324bd1d
SHA1 hash:
3850634bb15a112623222972ef554c8d1eca16f4
Detections:
win_flawedammyy_auto
Create hunting rule
Link:
https://www.unpac.me/results/91bc8ec8-80da-46dc-a32b-456c25a90404/
Parent samples :
44dc55275444f583d81f224be2172d1468ca7901032329ad2210a3b7abfaf80e
b3a1509f77da1f09f79e2d0d6b6c6938db01f8ec67fa6adcf992eeb5b6b8698a
6a3648d9ef381db17f71b6e13ed8006fd12069183e2824b455a170afc64fa0ba
7b7c066f031d5021b3ce30236a545cfea9736fded345e10d3380dd5c89447417
145c299180fb1556c843a944b33f57c933382c801906a9b7ce3f59f7028b0409
SH256 hash:
91c98c0775ec88842d83761daca43afd6cfcb53f2511653092bd567552d537d0
MD5 hash:
cdb9d1fed8d0351dd2bec9fc59a0d7b5
SHA1 hash:
a0976007d15acc4139b20c42b0159991c78660e7
Link:
https://www.unpac.me/results/91bc8ec8-80da-46dc-a32b-456c25a90404/
SH256 hash:
4bf14031eb0460e4e8234ef1157d8a254354504ced37f86fdbb1644ed45302c0
MD5 hash:
a4e21a6c9cde2319a1d2dc7335229e47
SHA1 hash:
141082e43fd1bbe6e5ac022dd4074b6c9e7a23d4
Detections:
win_flawedammyy_auto
Create hunting rule
Link:
https://www.unpac.me/results/91bc8ec8-80da-46dc-a32b-456c25a90404/
Parent samples :
44dc55275444f583d81f224be2172d1468ca7901032329ad2210a3b7abfaf80e
b3a1509f77da1f09f79e2d0d6b6c6938db01f8ec67fa6adcf992eeb5b6b8698a
6a3648d9ef381db17f71b6e13ed8006fd12069183e2824b455a170afc64fa0ba
7b7c066f031d5021b3ce30236a545cfea9736fded345e10d3380dd5c89447417
145c299180fb1556c843a944b33f57c933382c801906a9b7ce3f59f7028b0409
SH256 hash:
b3a1509f77da1f09f79e2d0d6b6c6938db01f8ec67fa6adcf992eeb5b6b8698a
MD5 hash:
cdd187b140f787efa951fab18d274cfc
SHA1 hash:
04dd7b20c6ed955f23a745b18a6cf3ffdd1a6f94
Link:
https://www.unpac.me/results/91bc8ec8-80da-46dc-a32b-456c25a90404/
Malware family:
GuLoader
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/b3a1509f77da/report/overview.html
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
GuLoader
Score:
0.90
Link:
https://yomi.yoroi.company/submissions/b3a1509f77da1f09f79e2d0d6b6c6938db01f8ec67fa6adcf992eeb5b6b8698a

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:win_flawedammyy_auto
Create hunting rule
Author:Felix Bilstein - yara-signator at cocacoding dot com
Description:Detects win.flawedammyy.

File information

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

Malspam

GuLoader

Executable exe b3a1509f77da1f09f79e2d0d6b6c6938db01f8ec67fa6adcf992eeb5b6b8698a

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/398151/

Comments