MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 083a3fd47e58d83c6a4265bcb00f93d30cc2901d6637ae9648411e83d3ad5017. 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: 7


Intelligence 7 IOCs YARA 1 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 083a3fd47e58d83c6a4265bcb00f93d30cc2901d6637ae9648411e83d3ad5017
SHA3-384 hash: 9f24898e97d928d2b551dd5b068f704ce1c25043af21751250da301daf3cedd72c3e3a6b3f83f9f6c20b641efa5da7e7
SHA1 hash: 5394d29dccb37484e378153d04a159e5f0949eac
MD5 hash: 8427d5d2d6c63c69825a573ca20e141f
humanhash: bulldog-autumn-colorado-pasta
File name:Merskum.com
Download: download sample
Signature GuLoader
Create hunting rule
File size:283'744 bytes
First seen:2022-07-11 11:17:46 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash 5f0c714c36e6cc016b3a1f4bc86559e4 (199 x GuLoader, 14 x Formbook, 4 x AgentTesla)
ssdeep 6144:7DfejPtJ1a5Bn9hoiOeJd0WyuH3tGPvtMOkGQUSs:fTzhHRd0Wyg3tLjBa
Threatray 3'352 similar samples on MalwareBazaar
TLSH T103549D81F06054D3DE5A1BB24C3E9D7021A77E78A4B4A50E266F3A2E57F33D2105EE1E
TrID 48.8% (.EXE) Win32 Executable MS Visual C++ (generic) (31206/45/13)
16.4% (.EXE) Win64 Executable (generic) (10523/12/4)
10.2% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
7.8% (.EXE) Win16 NE executable (generic) (5038/12/1)
7.0% (.EXE) Win32 Executable (generic) (4505/5/1)
File icon (PE):PE icon
dhash icon 1711414141410312 (2 x GuLoader)
Reporter GovCERT_CH
Tags:exe GuLoader signed

Code Signing Certificate

Organisation:PAIRPIGERNES psykers
Issuer:PAIRPIGERNES psykers
Algorithm:sha256WithRSAEncryption
Valid from:2022-07-11T09:55:05Z
Valid to:2023-07-11T09:55:05Z
Serial number: -11efedc0a89e4736
Thumbprint Algorithm:SHA256
Thumbprint: ed22bc1ef674a62343f01019801f9d6467b7c27bb7149e4a6e463ebb260d312c
Source:This information was brought to you by ReversingLabs A1000 Malware Analysis Platform

Intelligence

File Origin
# of uploads :
1
# of downloads :
247
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
Merskum.com
Verdict:
Malicious activity
Analysis date:
2022-07-11 11:08:49 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/55d1c176-399c-4f39-bf31-e6799705bfde

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/286189/
Detection(s):
SecuriteInfo.com.W32.AIDetect.malware2.22579.10481.UNOFFICIAL
Create hunting rule

Result
Verdict:
Clean
Maliciousness:

Behaviour
Searching for the window
Creating a window
Creating a file in the %temp% subdirectories
Creating a file
Result
Malware family:
n/a
Score:
  5/10
Tags:
n/a
Link:
https://dragonfly.certego.net/analysis/25046/overview
Behaviour
MalwareBazaar
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
buer overlay packed shell32.dll wacatac
Link:
https://www.filescan.io/uploads/62cc06edbbcf6baf279365a8/reports/d6290ea8-ccc0-433d-b485-0a86d98025b9/overview
Result
Verdict:
UNKNOWN
Details
Windows PE Executable
Found a Windows Portable Executable (PE) binary. Depending on context, the presence of a binary is suspicious or malicious.
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/f6100b31-f32c-4f59-865d-d827ccc5378f
Result
Threat name:
FormBook, GuLoader
Create hunting rule
Detection:
malicious
Classification:
troj.evad.spyw
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1028478
Signature
Antivirus detection for URL or domain
Benign windows process drops PE files
C2 URLs / IPs found in malware configuration
Injects a PE file into a foreign processes
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)
Multi AV Scanner detection for submitted file
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Snort IDS alert for network traffic
Submitted file has a suspicious file extension
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)
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Mail credentials (via file / registry access)
Writes to foreign memory regions
Yara detected FormBook
Yara detected GuLoader
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 660975 Sample: Merskum.com Startdate: 11/07/2022 Architecture: WINDOWS Score: 100 53 xn--prt--marier-b7a1k.com 2->53 55 www.zabrodriguez.com 2->55 57 31 other IPs or domains 2->57 75 Submitted file has a suspicious file extension 2->75 77 Snort IDS alert for network traffic 2->77 79 Malicious sample detected (through community Yara rule) 2->79 81 6 other signatures 2->81 11 Merskum.com 6 37 2->11         started        signatures3 process4 file5 49 C:\Users\user\AppData\Local\...\System.dll, PE32 11->49 dropped 97 Tries to detect Any.run 11->97 15 Merskum.com 6 11->15         started        signatures6 process7 dnsIp8 65 bc-ekb.ru 37.140.192.219, 443, 49734, 49781 AS-REGRU Russian Federation 15->65 67 Modifies the context of a thread in another process (thread injection) 15->67 69 Tries to detect Any.run 15->69 71 Maps a DLL or memory area into another process 15->71 73 2 other signatures 15->73 19 explorer.exe 1 6 15->19 injected signatures9 process10 dnsIp11 59 www.usefuldiameter.com 103.224.212.220, 49762, 49763, 49794 TRELLIAN-AS-APTrellianPtyLimitedAU Australia 19->59 61 xn--prt--marier-b7a1k.com 81.169.145.105, 49786, 49787, 80 STRATOSTRATOAGDE Germany 19->61 63 21 other IPs or domains 19->63 47 C:\Users\user\AppData\...\5jd0p8lgtmhx2e.exe, PE32 19->47 dropped 83 System process connects to network (likely due to code injection or exploit) 19->83 85 Benign windows process drops PE files 19->85 24 cscript.exe 1 12 19->24         started        27 5jd0p8lgtmhx2e.exe 17 19->27         started        file12 signatures13 process14 file15 87 Tries to steal Mail credentials (via file / registry access) 24->87 89 Tries to harvest and steal browser information (history, passwords, etc) 24->89 91 Writes to foreign memory regions 24->91 95 3 other signatures 24->95 30 cmd.exe 2 24->30         started        33 cmd.exe 1 24->33         started        35 cmd.exe 1 24->35         started        37 firefox.exe 24->37         started        51 C:\Users\user\AppData\Local\...\System.dll, PE32 27->51 dropped 93 Tries to detect Any.run 27->93 39 5jd0p8lgtmhx2e.exe 6 27->39         started        signatures16 process17 signatures18 99 Tries to harvest and steal browser information (history, passwords, etc) 30->99 41 conhost.exe 30->41         started        43 conhost.exe 33->43         started        45 conhost.exe 35->45         started        101 Tries to detect Any.run 39->101 process19
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/083a3fd47e58d83c6a4265bcb00f93d30cc2901d6637ae9648411e83d3ad5017/
Threat name:
Win32.Trojan.GuLoader
Create hunting rule
Status:
Malicious
First seen:
2022-07-11 10:42:02 UTC
File Type:
PE (Exe)
Extracted files:
6
AV detection:
17 of 26 (65.38%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=ba5d7vd6ldmdy2scmw6lad4t2mgmfea5my325fsiiepihu5nkalq._file
Verdict:
suspicious
Similar samples:
2fe1aace85b4bf69778fce02eaba9c3d1a139fd40770d6296d3fd9970efacb18
GuLoader
3faa50f804161625bca7b0f900367c6f6f127a40a0914cdf2d47a463d69795b6
GuLoader
4539d9c199b2fb7c37b08ab4ef32c6edd3e3e26f53f2289fa6ef3eb970cf8970
GuLoader
9357b03da4163feee42bc9b5e8c86772bfb73bdd5c8ee546bfad1e8c06f69774
GuLoader
b920c8e03050d0edb34c60f894105d65f847a66bb4f61259b70eca039adf1e3b
GuLoader
bf31d8b83e50a7af3e2dc746c74b85d64ce28d7c33b95c09cd46b9caa4d53cad
GuLoader
c494dceddfa1c8c6944a93f902c641ab5f99352ba48b81849e576f7da353314c
GuLoader
dbab95bfe56a7e0a0425eb323f49f545f236168494f79e440279470d0af5652f
GuLoader
dd88182da9939749fdd467feebff34fb9e039a30a8a82756f0337a205620ef07
GuLoader
e9ecd6320125813e0eccee9cb2577c8f55f4d0a29d4d65c26cfc3a3a99198b6b
GuLoader
+ 3'342 additional samples on MalwareBazaar
Result
Malware family:
n/a
Score:
  7/10
Tags:
discovery
Link:
https://tria.ge/reports/220711-nd9q7sgehj/
Behaviour
Enumerates physical storage devices
Drops file in Windows directory
Checks installed software on the system
Loads dropped DLL
Unpacked files
SH256 hash:
c7a20bcaa0197aedddc8e4797bbb33fdf70d980f5e83c203d148121c2106d917
MD5 hash:
792b6f86e296d3904285b2bf67ccd7e0
SHA1 hash:
966b16f84697552747e0ddd19a4ba8ab5083af31
Link:
https://www.unpac.me/results/f4c38551-6189-4788-b787-50a87aa4c4c2/
SH256 hash:
083a3fd47e58d83c6a4265bcb00f93d30cc2901d6637ae9648411e83d3ad5017
MD5 hash:
8427d5d2d6c63c69825a573ca20e141f
SHA1 hash:
5394d29dccb37484e378153d04a159e5f0949eac
Link:
https://www.unpac.me/results/f4c38551-6189-4788-b787-50a87aa4c4c2/
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Legit
Score:
0.00
Link:
https://yomi.yoroi.company/submissions/083a3fd47e58d83c6a4265bcb00f93d30cc2901d6637ae9648411e83d3ad5017

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

File information

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

Malspam

GuLoader

Executable exe 083a3fd47e58d83c6a4265bcb00f93d30cc2901d6637ae9648411e83d3ad5017

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/286189/

Comments