MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 59258d6f37a00b896648a31ae71f01da6373e0efbdf5b3f3d637e6257dfe767f. 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: 13


Intelligence 13 IOCs YARA 4 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 59258d6f37a00b896648a31ae71f01da6373e0efbdf5b3f3d637e6257dfe767f
SHA3-384 hash: b54ef285db30cd2727fcbd1b07b9b52ebe0651073aad56aedb5007dcf782e2f6c8b34e3a2060be72d732776f7a13614a
SHA1 hash: 453523dfd4f46a865ebe159ff0cffcfdf546c2fb
MD5 hash: c68c7de245d3391ad8c42302a1bf5ba1
humanhash: minnesota-purple-blossom-oscar
File name:Request for Best Offer- HS CODE REF PO#2010050.exe
Download: download sample
Signature GuLoader
Create hunting rule
File size:911'960 bytes
First seen:2025-03-06 10:15:17 UTC
Last seen:2025-03-06 11:40:20 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash 671f2a1f8aee14d336bab98fea93d734 (182 x GuLoader, 4 x Formbook, 4 x RemcosRAT)
ssdeep 24576:RF/JKJyfdYyJfpLjUrLoPN8WW6nLyaytQ:LUGY2fxjUrLWwO
TLSH T111152391B3A5C963C6890130CDB237F69646BE54C1E156A75724BF273E31F31EE0B28A
TrID 47.3% (.EXE) Win32 Executable MS Visual C++ (generic) (31206/45/13)
15.9% (.EXE) Win64 Executable (generic) (10522/11/4)
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)
Magika pebin
Reporter threatcat_ch
Tags:exe GuLoader signed

Code Signing Certificate

Organisation:Troldskes
Issuer:Troldskes
Algorithm:sha256WithRSAEncryption
Valid from:2024-09-08T10:01:34Z
Valid to:2025-09-08T10:01:34Z
Serial number: 7d84091d62c1172975c06ab9cac6b32618e2b05b
Thumbprint Algorithm:SHA256
Thumbprint: 92b902d1d478b609e3731abf03fcc373e702c07f968143fcb2dc6a6a5ad8c2e1
Source:This information was brought to you by ReversingLabs A1000 Malware Analysis Platform

Intelligence

File Origin
# of uploads :
2
# of downloads :
618
Origin country :
CH CH
Vendor Threat Intelligence
Malware family:
agenttesla
Create hunting rule
ID:
1
File name:
Request for Best Offer- HS CODE REF PO#2010050.exe
Verdict:
Malicious activity
Analysis date:
2025-03-06 10:17:31 UTC
Tags:
evasion stealer agenttesla ftp exfiltration
Link:
https://app.any.run/tasks/4f839ae9-cba9-4129-8593-4ca432c7fffa

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection(s):
SecuriteInfo.com.FileRepMalware.14645.16449.UNOFFICIAL
Create hunting rule

Verdict:
Malicious
Score:
93.3%
Link:
https://cyber-fortress.com/docs/result/index.php?id=67c9778fc8d04e92a4bf59d6
Tags:
obfuscate injector virus nsis
Result
Verdict:
Clean
Maliciousness:

Behaviour
Creating a window
Creating a file
Launching a process
Using the Windows Management Instrumentation requests
Verdict:
Malicious
Labled as:
Win/malicious_confidence_100%
Link:
https://www.hybrid-analysis.com/sample/59258d6f37a00b896648a31ae71f01da6373e0efbdf5b3f3d637e6257dfe767f
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:
Suspicious
Link:
https://analyze.intezer.com/analyses/13d88660-78f9-41a9-8591-2fbf2c07b984
Result
Threat name:
GuLoader
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1630866
Signature
AI detected suspicious PE digital signature
Check if machine is in data center or colocation facility
Early bird code injection technique detected
Found suspicious powershell code related to unpacking or dynamic code loading
Initial sample is a PE file and has a suspicious name
Joe Sandbox ML detected suspicious sample
Loading BitLocker PowerShell Module
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Powershell drops PE file
Queries sensitive network adapter information (via WMI, Win32_NetworkAdapter, often done to detect virtual machines)
Queries sensitive video device information (via WMI, Win32_VideoController, often done to detect virtual machines)
Queues an APC in another process (thread injection)
Suspicious powershell command line found
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 GuLoader
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1630866 Sample: Request for Best Offer- HS ... Startdate: 06/03/2025 Architecture: WINDOWS Score: 100 32 ip-api.com 2->32 34 fr.kras.by 2->34 44 Multi AV Scanner detection for dropped file 2->44 46 Multi AV Scanner detection for submitted file 2->46 48 Yara detected GuLoader 2->48 50 5 other signatures 2->50 8 Request for Best Offer- HS CODE REF PO#2010050.exe 1 41 2->8         started        signatures3 process4 file5 22 C:\Users\user\AppData\Local\...behaviorgraphurkha.Rak, Unicode 8->22 dropped 52 Suspicious powershell command line found 8->52 12 powershell.exe 30 8->12         started        signatures6 process7 file8 24 Request for Best O... REF PO#2010050.exe, PE32 12->24 dropped 26 Request for Best O...exe:Zone.Identifier, ASCII 12->26 dropped 54 Early bird code injection technique detected 12->54 56 Writes to foreign memory regions 12->56 58 Found suspicious powershell code related to unpacking or dynamic code loading 12->58 60 3 other signatures 12->60 16 msiexec.exe 15 8 12->16         started        20 conhost.exe 12->20         started        signatures9 process10 dnsIp11 28 ip-api.com 208.95.112.1, 49917, 80 TUT-ASUS United States 16->28 30 fr.kras.by 46.175.171.139, 49912, 80 NETBERRY-ASBY Belarus 16->30 36 Queries sensitive video device information (via WMI, Win32_VideoController, often done to detect virtual machines) 16->36 38 Queries sensitive network adapter information (via WMI, Win32_NetworkAdapter, often done to detect virtual machines) 16->38 40 Tries to steal Mail credentials (via file / registry access) 16->40 42 2 other signatures 16->42 signatures12
Score:
99%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/59258d6f37a00b896648a31ae71f01da6373e0efbdf5b3f3d637e6257dfe767f
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/59258d6f37a00b896648a31ae71f01da6373e0efbdf5b3f3d637e6257dfe767f/
Threat name:
Win32.Trojan.GuLoader
Create hunting rule
Status:
Malicious
First seen:
2025-03-06 10:16:11 UTC
File Type:
PE (Exe)
Extracted files:
21
AV detection:
20 of 24 (83.33%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=lesy23zxuafyszsiumnoohyb3jrxhyhpxx23h46wg7tck7p6oz7q._file
Result
Malware family:
agenttesla
Create hunting rule
Score:
  10/10
Tags:
family:agenttesla discovery execution keylogger persistence spyware stealer trojan
Link:
https://tria.ge/reports/250306-mavbnswpv4/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
System Location Discovery: System Language Discovery
Drops file in Windows directory
Suspicious use of NtCreateThreadExHideFromDebugger
Suspicious use of NtSetInformationThreadHideFromDebugger
Blocklisted process makes network request
Looks up external IP address via web service
Command and Scripting Interpreter: PowerShell
AgentTesla
Agenttesla family
Verdict:
Malicious
Tags:
loader guloader
YARA:
NSIS_GuLoader_July_2024
Link:
https://app.threat.zone/submission/dc212e4d-9481-4b21-921a-ac66bdf17298
Unpacked files
SH256 hash:
59258d6f37a00b896648a31ae71f01da6373e0efbdf5b3f3d637e6257dfe767f
MD5 hash:
c68c7de245d3391ad8c42302a1bf5ba1
SHA1 hash:
453523dfd4f46a865ebe159ff0cffcfdf546c2fb
Link:
https://www.unpac.me/results/bc552a7e-1ec0-4be7-aa49-981769d6bbb4/
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/59258d6f37a00b896648a31ae71f01da6373e0efbdf5b3f3d637e6257dfe767f

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:shellcode
Create hunting rule
Author:nex
Description:Matched shellcode byte patterns
Rule name:Sus_Obf_Enc_Spoof_Hide_PE
Create hunting rule
Author:XiAnzheng
Description:Check for Overlay, Obfuscating, Encrypting, Spoofing, Hiding, or Entropy Technique(can create FP)

File information

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

Malspam

GuLoader

Executable exe 59258d6f37a00b896648a31ae71f01da6373e0efbdf5b3f3d637e6257dfe767f

(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
SECURITY_BASE_APIUses Security Base APIADVAPI32.dll::AdjustTokenPrivileges
SHELL_APIManipulates System ShellSHELL32.dll::ShellExecuteExA
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::MoveFileA
KERNEL32.dll::MoveFileExA
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