MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 731c7f66a98fa2a285956520e557a629b2e7e74e46c27e21158147dd29157cfd. 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: 9


Intelligence 9 IOCs YARA 2 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 731c7f66a98fa2a285956520e557a629b2e7e74e46c27e21158147dd29157cfd
SHA3-384 hash: d1150be4e5457d16ededb8a18ca1fcddd0a5f454aa1720a9b3f76d1f0c3a06d9a02179a444846361837ba5f72b63a59c
SHA1 hash: 736785d2256ec2b111b4216f5c85d44167711e16
MD5 hash: bbc92a4d59c68de5c1a5fe6829ae7a03
humanhash: friend-item-coffee-princess
File name:Document#789566%6.exe
Download: download sample
Signature GuLoader
Create hunting rule
File size:404'632 bytes
First seen:2023-03-01 09:39:09 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash 1f23f452093b5c1ff091a2f9fb4fa3e9 (276 x GuLoader, 37 x RemcosRAT, 23 x AgentTesla)
ssdeep 12288:f0UVAoF36ANgRSCs5CuFBQAKc2S85wo/Ly:f0UVA836MnEugFzl/Ly
Threatray 634 similar samples on MalwareBazaar
TLSH T1E984024F03C2F866DCA51B71F842063A6D79D95328A1C71723319A8EFD223C3ED196A7
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 70e4ecec64b4c4f0 (1 x GuLoader)
Reporter jomphatt
Tags:BoredFluff exe GuLoader signed

Code Signing Certificate

Organisation:
Issuer:
Algorithm:sha256WithRSAEncryption
Valid from:2022-12-01T03:21:10Z
Valid to:2025-11-30T03:21:10Z
Serial number: 5eaf2c810b8ea35f9187f23a6efca6a9bbdda198
Thumbprint Algorithm:SHA256
Thumbprint: 16de7a134e9efea04ee5f2dd8a4a9daff7021b53422699fb6c63b2378bd270b5
Source:This information was brought to you by ReversingLabs A1000 Malware Analysis Platform

Intelligence

File Origin
# of uploads :
1
# of downloads :
213
Origin country :
TH TH
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
fbf76d76-5b03-4e28-a3e1-7f630c5cc035
Verdict:
Malicious activity
Analysis date:
2023-03-01 09:40:57 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/48b86fc3-0d2c-44d7-b4d8-52b453091ed7

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/370770/
Result
Verdict:
Clean
Maliciousness:

Behaviour
Creating a file in the %temp% directory
Creating a window
Creating a file
Delayed reading of the file
Sending a custom TCP request
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
overlay packed shell32.dll
Link:
https://www.filescan.io/uploads/63ff1d73bfec0852a68e1edc/reports/42b0de30-3d81-4c9d-9052-2158d0d44904/overview
Verdict:
Unknown
Link:
https://www.hybrid-analysis.com/sample/731c7f66a98fa2a285956520e557a629b2e7e74e46c27e21158147dd29157cfd
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/52f19674-5611-408c-814f-e150b406a0d5
Result
Threat name:
Remcos, GuLoader
Create hunting rule
Detection:
malicious
Classification:
troj.evad.phis.spyw
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1184777
Signature
Detected unpacking (changes PE section rights)
Initial sample is a PE file and has a suspicious name
Installs a global keyboard hook
Maps a DLL or memory area into another process
Sample has a suspicious name (potential lure to open the executable)
Sigma detected: Remcos
Tries to detect Any.run
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Instant Messenger accounts or passwords
Tries to steal Mail credentials (via file / registry access)
Yara detected GuLoader
Yara detected Remcos RAT
Yara detected WebBrowserPassView password recovery tool
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 11874 Sample: Document#789566%6.exe Startdate: 01/03/2023 Architecture: WINDOWS Score: 100 31 googlehosted.l.googleusercontent.com 2->31 33 geoplugin.net 2->33 35 2 other IPs or domains 2->35 51 Yara detected GuLoader 2->51 53 Yara detected Remcos RAT 2->53 55 Sigma detected: Remcos 2->55 57 3 other signatures 2->57 8 Document#789566%6.exe 1 28 2->8         started        signatures3 process4 file5 27 C:\Users\user\AppData\Local\...\System.dll, PE32 8->27 dropped 59 Detected unpacking (changes PE section rights) 8->59 61 Tries to detect Any.run 8->61 12 Document#789566%6.exe 3 16 8->12         started        signatures6 process7 dnsIp8 39 googlehosted.l.googleusercontent.com 142.250.181.225, 443, 49870 GOOGLEUS United States 12->39 41 drive.google.com 142.250.186.46, 443, 49869 GOOGLEUS United States 12->41 43 2 other IPs or domains 12->43 29 C:\Users\user\...\Hematodynamometer151.exe, PE32 12->29 dropped 63 Tries to harvest and steal browser information (history, passwords, etc) 12->63 65 Tries to detect Any.run 12->65 67 Maps a DLL or memory area into another process 12->67 69 Installs a global keyboard hook 12->69 17 Document#789566%6.exe 1 12->17         started        20 Document#789566%6.exe 1 12->20         started        22 Document#789566%6.exe 1 12->22         started        24 27 other processes 12->24 file9 signatures10 process11 dnsIp12 45 Tries to steal Instant Messenger accounts or passwords 17->45 47 Tries to steal Mail credentials (via file / registry access) 17->47 37 192.168.11.1 unknown unknown 24->37 49 Tries to harvest and steal browser information (history, passwords, etc) 24->49 signatures13
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/731c7f66a98fa2a285956520e557a629b2e7e74e46c27e21158147dd29157cfd/
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=omoh6zvjr6rkfbmvmuqokv5gfgzopz2oi3bh4iivqfd52kivpt6q._file
Verdict:
unknown
Similar samples:
0ece63c571823c71e6d37ac23d7f4bc8633b977f175237594d0cda52ea25bb7f
GuLoader
153fb690a1f464ba3a1c37d1d8d103010a54a00bd10eb86ead709e275dc5d302
GuLoader
18b1abba90cf4a74b7216b91f02febb1c8694113f5ddc3507fd35b66253bcb83
GuLoader
3a364b193d256ee86f9c7dc66ca6322f64ffacda0685e98d9909ad90a595831b
GuLoader
53cd75c785b440cbc32ded5c23144e59ec2d910618f3733dff686cefb699310c
GuLoader
6ab1444d305f5a3ffafd05cadd42ac71f058ad19257f67b0210d847848b8a06e
GuLoader
ab1f192fb8f916dcd581face8064290632cc84049382de572156f4538cdec085
GuLoader
d418b33e0f47d43fcc31e623c7c2b581aa9df51fb47a15414a8bb45b009f813b
GuLoader
+ 624 additional samples on MalwareBazaar
Result
Malware family:
guloader
Create hunting rule
Score:
  10/10
Tags:
family:guloader collection discovery downloader persistence spyware stealer
Link:
https://tria.ge/reports/230301-lm7l4aff32/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Drops file in Program Files directory
Drops file in Windows directory
Suspicious use of NtCreateThreadExHideFromDebugger
Suspicious use of NtSetInformationThreadHideFromDebugger
Suspicious use of SetThreadContext
Accesses Microsoft Outlook accounts
Adds Run key to start application
Checks installed software on the system
Legitimate hosting services abused for malware hosting/C2
Checks QEMU agent file
Loads dropped DLL
Reads user/profile data of web browsers
NirSoft MailPassView
NirSoft WebBrowserPassView
Nirsoft
Guloader,Cloudeye
Unpacked files
SH256 hash:
c2f405d7402f815d0c3fadd9a50f0bbbb1bab9aa38fe347823478a2587299448
MD5 hash:
9625d5b1754bc4ff29281d415d27a0fd
SHA1 hash:
80e85afc5cccd4c0a3775edbb90595a1a59f5ce0
Link:
https://www.unpac.me/results/eb4940e3-01aa-4d6c-b481-759ccc331099/
SH256 hash:
731c7f66a98fa2a285956520e557a629b2e7e74e46c27e21158147dd29157cfd
MD5 hash:
bbc92a4d59c68de5c1a5fe6829ae7a03
SHA1 hash:
736785d2256ec2b111b4216f5c85d44167711e16
Link:
https://www.unpac.me/results/eb4940e3-01aa-4d6c-b481-759ccc331099/
Malware family:
Remcos
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/731c7f66a98f/report/overview.html
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/731c7f66a98fa2a285956520e557a629b2e7e74e46c27e21158147dd29157cfd

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: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.

  
Delivery method
Distributed via e-mail link
Cape
Cape
https://www.capesandbox.com/analysis/370770/

Comments