MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 66ca38af42e53349449285404e615428e59c1ec73f2b7e4901fc02c7d0c46e0a. 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 6 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 66ca38af42e53349449285404e615428e59c1ec73f2b7e4901fc02c7d0c46e0a
SHA3-384 hash: f034bb8aa2a41843d0a94a10c291d12e46c9196e997c0d3e7601e8dadce5ea5323fb41feaba3e7241c213f48904c297b
SHA1 hash: f7b0a1f3dd2ac732be6b9a5d96be7b89b128a8fd
MD5 hash: cfcafb67e8948e3f1eb53d617a799350
humanhash: undress-equal-march-fix
File name:TransactionDetailsAAED768093.scr
Download: download sample
Signature GuLoader
Create hunting rule
File size:706'376 bytes
First seen:2024-08-07 19:38:12 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 6144:5BeaNsIYD2unHU8EJN0nLGK0mz5dBMpy6OURSadFiwaOeFwU+MXGCCb33QY23wW6:o+kWwd1dvhUcmFMOeVsCEHV0as30WQ
TLSH T158E49D57268F5EFBCC688577CC965327E9777C4B47A20622670077720C31263BBB6A88
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) (4504/4/1)
File icon (PE):PE icon
dhash icon 718c86832e8ecc71 (1 x GuLoader)
Reporter threatcat_ch
Tags:exe GuLoader signed

Code Signing Certificate

Organisation:Lrestol Hyoidean Snvlehoveder
Issuer:Lrestol Hyoidean Snvlehoveder
Algorithm:sha256WithRSAEncryption
Valid from:2024-03-17T02:21:11Z
Valid to:2027-03-17T02:21:11Z
Serial number: 2edaada9c59f2e5743efa885a687c45e4e4e14fd
Thumbprint Algorithm:SHA256
Thumbprint: a880bd1787490ff4e699a1246d82f86559c3caf38c9af39f20fd8713bb908373
Source:This information was brought to you by ReversingLabs A1000 Malware Analysis Platform

Intelligence

File Origin
# of uploads :
1
# of downloads :
413
Origin country :
CH CH
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
TransactionDetailsAAED768093.scr
Verdict:
Malicious activity
Analysis date:
2024-08-07 19:39:38 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/9555292d-7c87-45e0-935d-0038d97d7184

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection(s):
SecuriteInfo.com.Mal.Generic-S.31020.16397.20236.UNOFFICIAL
Create hunting rule

Verdict:
Malicious
Score:
90.2%
Link:
https://cyber-fortress.com/docs/result/index.php?id=66b3cd57aa5b40be0a9fd6ed
Tags:
Encryption Static Inject
Result
Verdict:
Clean
Maliciousness:

Behaviour
Searching for the window
Creating a window
Creating a file
Creating a file in the %temp% directory
Delayed reading of the file
Verdict:
Likely Malicious
Threat level:
  7.5/10
Confidence:
100%
Tags:
fingerprint installer lolbin masquerade microsoft_visual_cc overlay packed shell32
Link:
https://www.filescan.io/uploads/66b3cd5999ea8891b192b6dc/reports/fde7609e-5933-4b43-a1f7-aee3cf05194f/overview
Verdict:
Malicious
Labled as:
Win/malicious_confidence_100%
Link:
https://www.hybrid-analysis.com/sample/66ca38af42e53349449285404e615428e59c1ec73f2b7e4901fc02c7d0c46e0a
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.
Malware family:
NSIS
Create hunting rule
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/fe34e0a5-5400-4c4f-83a1-100c2c37ba96
Result
Threat name:
GuLoader, Snake Keylogger
Create hunting rule
Detection:
malicious
Classification:
troj.evad.spyw
Score:
84 / 100
Link:
https://www.joesandbox.com/analysis/1489643
Signature
Switches to a custom stack to bypass stack traces
Tries to detect the country of the analysis system (by using the IP)
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Mail credentials (via file / registry access)
Uses the Telegram API (likely for C&C communication)
Yara detected GuLoader
Yara detected Snake Keylogger
Yara detected Telegram RAT
Behaviour
Behavior Graph:
Download SVG
Score:
99%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/66ca38af42e53349449285404e615428e59c1ec73f2b7e4901fc02c7d0c46e0a
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/66ca38af42e53349449285404e615428e59c1ec73f2b7e4901fc02c7d0c46e0a/
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=m3fdrl2c4uzusresqvae4ykufdszyhwhh4vx4sib7qbmpugenyfa._file
Verdict:
malicious
Label(s):
cloudeye
Create hunting rule
Result
Malware family:
n/a
Score:
  7/10
Tags:
discovery
Link:
https://tria.ge/reports/240809-k4qt8syeln/
Behaviour
Suspicious behavior: MapViewOfSection
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
System Location Discovery: System Language Discovery
Drops file in Program Files directory
Drops file in Windows directory
Suspicious use of NtSetInformationThreadHideFromDebugger
Suspicious use of SetThreadContext
Loads dropped DLL
Verdict:
Malicious
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/ef5d710f-cbff-476b-8ba5-4f75f5d87aca
Unpacked files
SH256 hash:
fa4ab1d6f79fd677433a31ada7806373a789d34328da46ccb0449bbf347bd73e
MD5 hash:
3f176d1ee13b0d7d6bd92e1c7a0b9bae
SHA1 hash:
fe582246792774c2c9dd15639ffa0aca90d6fd0b
Link:
https://www.unpac.me/results/eaadd8d4-3806-468a-8296-cbc30ae436bd/
SH256 hash:
66ca38af42e53349449285404e615428e59c1ec73f2b7e4901fc02c7d0c46e0a
MD5 hash:
cfcafb67e8948e3f1eb53d617a799350
SHA1 hash:
f7b0a1f3dd2ac732be6b9a5d96be7b89b128a8fd
Link:
https://www.unpac.me/results/eaadd8d4-3806-468a-8296-cbc30ae436bd/
Malware family:
GuLoader
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/66ca38af42e5/report/overview.html
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
DriveBy Activity
Score:
0.90
Link:
https://yomi.yoroi.company/submissions/66ca38af42e53349449285404e615428e59c1ec73f2b7e4901fc02c7d0c46e0a

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:Detect_SliverFox_String
Create hunting rule
Author:huoji
Description:Detect files is `SliverFox` malware
Rule name:Ins_NSIS_Buer_Nov_2020_1
Create hunting rule
Author:Arkbird_SOLG
Description:Detect NSIS installer used for Buer loader
Rule name:NSIS_GuLoader
Create hunting rule
Author:NDA0E
Description:Detects GuLoader using NSIS
Rule name:NSIS_GuLoader_July_2024
Create hunting rule
Author:NDA0E
Description:Detects GuLoader packed with NSIS installer
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 66ca38af42e53349449285404e615428e59c1ec73f2b7e4901fc02c7d0c46e0a

(this sample)

  
Delivery method
Distributed via e-mail attachment

BLint

The following table provides more information about this file using BLint. BLint is a Binary Linter to check the security properties, and capabilities in executables.

Findings
IDTitleSeverity
CHECK_DLL_CHARACTERISTICSMissing dll Security Characteristics (HIGH_ENTROPY_VA)high
Reviews
IDCapabilitiesEvidence
AUTH_APIManipulates User AuthorizationADVAPI32.dll::SetFileSecurityA
COM_BASE_APICan Download & Execute componentsole32.dll::CoCreateInstance
SECURITY_BASE_APIUses Security Base APIADVAPI32.dll::AdjustTokenPrivileges
SHELL_APIManipulates System ShellSHELL32.dll::ShellExecuteA
SHELL32.dll::SHFileOperationA
SHELL32.dll::SHGetFileInfoA
WIN32_PROCESS_APICan Create Process and ThreadsKERNEL32.dll::CreateProcessA
ADVAPI32.dll::OpenProcessToken
KERNEL32.dll::CloseHandle
KERNEL32.dll::CreateThread
WIN_BASE_APIUses Win Base APIKERNEL32.dll::LoadLibraryExA
KERNEL32.dll::GetDiskFreeSpaceA
KERNEL32.dll::GetCommandLineA
WIN_BASE_IO_APICan Create FilesKERNEL32.dll::CopyFileA
KERNEL32.dll::CreateDirectoryA
KERNEL32.dll::CreateFileA
KERNEL32.dll::DeleteFileA
KERNEL32.dll::MoveFileExA
KERNEL32.dll::MoveFileA
WIN_BASE_USER_APIRetrieves Account InformationADVAPI32.dll::LookupPrivilegeValueA
WIN_REG_APICan Manipulate Windows RegistryADVAPI32.dll::RegCreateKeyExA
ADVAPI32.dll::RegDeleteKeyA
ADVAPI32.dll::RegOpenKeyExA
ADVAPI32.dll::RegQueryValueExA
ADVAPI32.dll::RegSetValueExA
WIN_USER_APIPerforms GUI ActionsUSER32.dll::AppendMenuA
USER32.dll::EmptyClipboard
USER32.dll::FindWindowExA
USER32.dll::OpenClipboard
USER32.dll::PeekMessageA
USER32.dll::CreateWindowExA

Comments