MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 657a48043a872f3b614e4d7b335d71dea8b72c8292cb2cab1f2e67b2fc1b3c47. 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 2 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 657a48043a872f3b614e4d7b335d71dea8b72c8292cb2cab1f2e67b2fc1b3c47
SHA3-384 hash: 49030bab6b1d8df6b8deacb135d44f671c90efd5119325d676623c989bba739ff14659cb9af57d5c83ab67a99f1b2b7c
SHA1 hash: b7edade3326e9e2f9bdb4577c9b48bcea1da5354
MD5 hash: 18eefd7cdc2b7c6be83f77a97e811411
humanhash: wyoming-table-kansas-leopard
File name:INVOICE+PL .pdf.exe
Download: download sample
Signature GuLoader
Create hunting rule
File size:739'544 bytes
First seen:2024-04-03 12:57:25 UTC
Last seen:2024-04-03 13:26:10 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash e160ef8e55bb9d162da4e266afd9eef3 (140 x GuLoader, 33 x RemcosRAT, 17 x AgentTesla)
ssdeep 6144:R9KOQS4piEvQ57TcgqpGlLP90p0Vu5KxWw97r72MQXRvk72uj4ob4PzQrkRjuCcO:RsoJdL6p3kd72TXRvkdnaQrkRjhcd11g
TLSH T16BF4DFD518555759E8012BF62EB640CAE1B4DDA19A903932F0CDB9BFC93CB024E3E67C
TrID 92.7% (.EXE) NSIS - Nullsoft Scriptable Install System (846567/2/133)
3.4% (.EXE) Win32 Executable MS Visual C++ (generic) (31206/45/13)
1.1% (.EXE) Win64 Executable (generic) (10523/12/4)
0.7% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
0.5% (.EXE) Win16 NE executable (generic) (5038/12/1)
File icon (PE):PE icon
dhash icon 11cc96b2ab036821 (1 x GuLoader)
Reporter adrian__luca
Tags:exe GuLoader signed

Code Signing Certificate

Organisation:Klimaksers
Issuer:Klimaksers
Algorithm:sha256WithRSAEncryption
Valid from:2023-06-03T01:27:37Z
Valid to:2026-06-02T01:27:37Z
Serial number: 6f1d68d5070b4e39fd92e90c43b2670fbca68354
Thumbprint Algorithm:SHA256
Thumbprint: 78c2cd9245afb9417e7b7f670ac4d85522322c47d8644bf92c2a2901673f1698
Source:This information was brought to you by ReversingLabs A1000 Malware Analysis Platform

Intelligence

File Origin
# of uploads :
2
# of downloads :
296
Origin country :
HU HU
Vendor Threat Intelligence
Malware family:
guloader
Create hunting rule
ID:
1
File name:
657a48043a872f3b614e4d7b335d71dea8b72c8292cb2cab1f2e67b2fc1b3c47.exe
Verdict:
Malicious activity
Analysis date:
2024-04-03 12:57:49 UTC
Tags:
guloader
Link:
https://app.any.run/tasks/fd58ada4-bdbb-4865-a5e5-7020c48011ed

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Result
Verdict:
Clean
Maliciousness:

Behaviour
Creating a window
Searching for the 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:
installer lolbin masquerade overlay packed shell32
Link:
https://www.filescan.io/uploads/660d526e6ffbb8b1692eb14c/reports/19531021-e564-42e6-85bb-0544e7fb4c3e/overview
Verdict:
Malicious
Labled as:
Win/malicious_confidence_90%
Link:
https://www.hybrid-analysis.com/sample/657a48043a872f3b614e4d7b335d71dea8b72c8292cb2cab1f2e67b2fc1b3c47
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/2e44e7b3-0158-45e2-8590-e39e8dec6bb8
Result
Threat name:
GuLoader
Create hunting rule
Detection:
malicious
Classification:
troj.evad.spyw
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1419411
Signature
Check if machine is in data center or colocation facility
Creates multiple autostart registry keys
Hides that the sample has been downloaded from the Internet (zone.identifier)
Initial sample is a PE file and has a suspicious name
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Queries sensitive network adapter information (via WMI, Win32_NetworkAdapter, often done to detect virtual machines)
Sigma detected: Suspicious Double Extension File Execution
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)
Uses an obfuscated file name to hide its real file extension (double extension)
Yara detected GuLoader
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1419411 Sample: INVOICE+PL .pdf.exe Startdate: 03/04/2024 Architecture: WINDOWS Score: 100 32 ip-api.com 2->32 34 drive.usercontent.google.com 2->34 36 2 other IPs or domains 2->36 54 Multi AV Scanner detection for dropped file 2->54 56 Multi AV Scanner detection for submitted file 2->56 58 Yara detected GuLoader 2->58 60 5 other signatures 2->60 7 INVOICE+PL .pdf.exe 5 57 2->7         started        10 FTSKIaM.exe 19 2->10         started        13 FTSKIaM.exe 17 2->13         started        signatures3 process4 file5 28 C:\Users\user\Annoterede\...\Unbeholden.des, data 7->28 dropped 30 C:\Users\user\AppData\Local\...\System.dll, PE32 7->30 dropped 15 INVOICE+PL .pdf.exe 18 13 7->15         started        62 Multi AV Scanner detection for dropped file 10->62 64 Queries sensitive network adapter information (via WMI, Win32_NetworkAdapter, often done to detect virtual machines) 10->64 20 FTSKIaM.exe 14 9 10->20         started        signatures6 process7 dnsIp8 38 ip-api.com 208.95.112.1, 50319, 50323, 80 TUT-ASUS United States 15->38 40 drive.google.com 142.250.217.110, 443, 50316, 50320 GOOGLEUS United States 15->40 42 2 other IPs or domains 15->42 22 C:\Users\user\AppData\...\Forskudt.exe, PE32 15->22 dropped 24 C:\Users\user\AppData\Roaming\...\FTSKIaM.exe, PE32 15->24 dropped 26 C:\Users\user\...\FTSKIaM.exe:Zone.Identifier, ASCII 15->26 dropped 44 Tries to harvest and steal Putty / WinSCP information (sessions, passwords, etc) 15->44 46 Tries to steal Mail credentials (via file / registry access) 15->46 48 Creates multiple autostart registry keys 15->48 50 Hides that the sample has been downloaded from the Internet (zone.identifier) 15->50 52 Tries to harvest and steal browser information (history, passwords, etc) 20->52 file9 signatures10
Score:
99%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/657a48043a872f3b614e4d7b335d71dea8b72c8292cb2cab1f2e67b2fc1b3c47
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/657a48043a872f3b614e4d7b335d71dea8b72c8292cb2cab1f2e67b2fc1b3c47/
Threat name:
Win32.Trojan.Guloader
Create hunting rule
Status:
Malicious
First seen:
2024-03-22 23:20:29 UTC
File Type:
PE (Exe)
Extracted files:
37
AV detection:
16 of 38 (42.11%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=mv5eqbb2q4xtwykojv5tgxlr32ulolecslfszky7fzt3f7a3hrdq._file
Verdict:
malicious
Label(s):
cloudeye
Create hunting rule
Result
Malware family:
guloader
Create hunting rule
Score:
  10/10
Tags:
family:agenttesla family:guloader downloader keylogger persistence spyware stealer trojan
Link:
https://tria.ge/reports/240403-p7jmjsdg78/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Drops file in Program Files directory
Suspicious use of NtCreateThreadExHideFromDebugger
Suspicious use of NtSetInformationThreadHideFromDebugger
Suspicious use of SetThreadContext
Adds Run key to start application
Legitimate hosting services abused for malware hosting/C2
Looks up external IP address via web service
Loads dropped DLL
Reads WinSCP keys stored on the system
Reads data files stored by FTP clients
Reads user/profile data of local email clients
Reads user/profile data of web browsers
AgentTesla
Guloader,Cloudeye
Unpacked files
SH256 hash:
b7ccb923387cc346731471b20fc3df1ead13ec8c2e3147353c71bb0bd59bc8b1
MD5 hash:
6f5257c0b8c0ef4d440f4f4fce85fb1b
SHA1 hash:
b6ac111dfb0d1fc75ad09c56bde7830232395785
Link:
https://www.unpac.me/results/ca613f6c-0d3e-40d1-bc80-0e3ba43d7982/
SH256 hash:
657a48043a872f3b614e4d7b335d71dea8b72c8292cb2cab1f2e67b2fc1b3c47
MD5 hash:
18eefd7cdc2b7c6be83f77a97e811411
SHA1 hash:
b7edade3326e9e2f9bdb4577c9b48bcea1da5354
Link:
https://www.unpac.me/results/ca613f6c-0d3e-40d1-bc80-0e3ba43d7982/
Malware family:
AgentTesla
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/657a48043a87/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/657a48043a872f3b614e4d7b335d71dea8b72c8292cb2cab1f2e67b2fc1b3c47

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: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.

Malspam

GuLoader

Executable exe 657a48043a872f3b614e4d7b335d71dea8b72c8292cb2cab1f2e67b2fc1b3c47

(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
COM_BASE_APICan Download & Execute componentsole32.dll::CoCreateInstance
SHELL_APIManipulates System ShellSHELL32.dll::ShellExecuteA
SHELL32.dll::SHFileOperationA
SHELL32.dll::SHGetFileInfoA
WIN32_PROCESS_APICan Create Process and ThreadsKERNEL32.dll::CreateProcessA
KERNEL32.dll::CloseHandle
KERNEL32.dll::CreateThread
WIN_BASE_APIUses Win Base APIKERNEL32.dll::LoadLibraryA
KERNEL32.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::MoveFileA
KERNEL32.dll::GetWindowsDirectoryA
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