MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 726f2791905623a92d53b886b253f9f5e187df7e31e0c2ff27fcf52c4667f0be. 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: 12


Intelligence 12 IOCs YARA 3 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 726f2791905623a92d53b886b253f9f5e187df7e31e0c2ff27fcf52c4667f0be
SHA3-384 hash: d88cbb7d0ab0fe3572c1e93de3a3ca65d64615b620195a84d23b348f33e4215a8e698da0178ecd9792fdb9700d4cd24b
SHA1 hash: 0536d9a5892ccb8e1f30608c9906cd6ec90d3c5f
MD5 hash: 3021ebb7a74c678861449923f5e0d312
humanhash: uniform-pasta-comet-july
File name:726f2791905623a92d53b886b253f9f5e187df7e31e0c2ff27fcf52c4667f0be
Download: download sample
Signature GuLoader
Create hunting rule
File size:666'150 bytes
First seen:2025-05-09 13:45:42 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash 9a16e282eba7cc710070c0586c947693 (26 x GuLoader, 11 x VIPKeylogger, 7 x RemcosRAT)
ssdeep 12288:44PHII1JeR+H8v+PLG+b+cIbSiCyHgQo1KumBtwIL/3BWt:44PbukcGP9btpiC4gQo1Kum7tzRWt
TLSH T13CE42357D174A0F7F0A583F035A33B6AEEE6DD0414811B4F2BA066853CA4BD7970F28A
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
dhash icon b2a89c96a2cada72 (2'283 x Formbook, 981 x Loki, 803 x AgentTesla)
Reporter adrian__luca
Tags:exe GuLoader

Intelligence

File Origin
# of uploads :
1
# of downloads :
320
Origin country :
HU HU
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
726f2791905623a92d53b886b253f9f5e187df7e31e0c2ff27fcf52c4667f0be
Verdict:
Suspicious activity
Analysis date:
2025-05-09 11:56:37 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/9a4e9fb1-9c3e-4c7f-bf35-5ea08c3d8331

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Malicious
Score:
93.3%
Link:
https://cyber-fortress.com/docs/result/index.php?id=681e08d3e16384d6a70349df
Tags:
obfuscate shell virus nsis
Result
Verdict:
Clean
Maliciousness:

Behaviour
Creating a window
Creating a file in the %temp% subdirectories
Launching a process
Using the Windows Management Instrumentation requests
Creating a file
Verdict:
Likely Malicious
Threat level:
  7.5/10
Confidence:
100%
Tags:
blackhole installer microsoft_visual_cc overlay overlay packed packed packer_detected
Link:
https://www.filescan.io/uploads/681e07240b64e174c41fb97f/reports/0063f04d-fc1b-4605-b79c-6f0e8d8466b0/overview
Verdict:
Malicious
Labled as:
Trojan.Generic
Link:
https://www.hybrid-analysis.com/sample/726f2791905623a92d53b886b253f9f5e187df7e31e0c2ff27fcf52c4667f0be
Verdict:
Suspicious
Link:
https://analyze.intezer.com/analyses/1d489248-9cd0-4e44-95df-5f8a0367b2cb
Result
Threat name:
FormBook, GuLoader
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1686212
Signature
Drops PE files with a suspicious file extension
Early bird code injection technique detected
Found direct / indirect Syscall (likely to bypass EDR)
Found suspicious powershell code related to unpacking or dynamic code loading
Joe Sandbox ML detected suspicious sample
Loading BitLocker PowerShell Module
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 dropped file
Multi AV Scanner detection for submitted file
Performs DNS queries to domains with low reputation
Powershell drops PE file
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Sigma detected: Suspicious Script Execution From Temp Folder
Suricata IDS alerts for network traffic
Suspicious powershell command line found
Switches to a custom stack to bypass stack traces
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
Yara detected NSIS Injector
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1686212 Sample: yk9tZUfQuB.exe Startdate: 10/05/2025 Architecture: WINDOWS Score: 100 46 www.trust-systems.xyz 2->46 48 www.psychologyschool.pro 2->48 50 3 other IPs or domains 2->50 62 Suricata IDS alerts for network traffic 2->62 64 Multi AV Scanner detection for submitted file 2->64 66 Yara detected NSIS Injector 2->66 70 4 other signatures 2->70 11 yk9tZUfQuB.exe 2 32 2->11         started        15 svchost.exe 1 1 2->15         started        signatures3 68 Performs DNS queries to domains with low reputation 46->68 process4 dnsIp5 44 C:\Users\user\AppData\...\Obnebulate.Vas, Unicode 11->44 dropped 88 Suspicious powershell command line found 11->88 18 powershell.exe 30 11->18         started        60 127.0.0.1 unknown unknown 15->60 file6 signatures7 process8 file9 40 C:\Users\user\AppData\Local\...\Bystens.scr, PE32 18->40 dropped 42 C:\Users\user\...\Bystens.scr:Zone.Identifier, ASCII 18->42 dropped 72 Early bird code injection technique detected 18->72 74 Drops PE files with a suspicious file extension 18->74 76 Writes to foreign memory regions 18->76 78 5 other signatures 18->78 22 Bystens.scr 6 18->22         started        26 conhost.exe 18->26         started        signatures10 process11 dnsIp12 56 drive.usercontent.google.com 142.250.68.225, 443, 49733 GOOGLEUS United States 22->56 58 drive.google.com 142.250.69.14, 443, 49732 GOOGLEUS United States 22->58 82 Multi AV Scanner detection for dropped file 22->82 84 Maps a DLL or memory area into another process 22->84 86 Switches to a custom stack to bypass stack traces 22->86 28 WDCKCtpJetZZA3qs.exe 22->28 injected signatures13 process14 signatures15 90 Found direct / indirect Syscall (likely to bypass EDR) 28->90 31 compact.exe 13 28->31         started        process16 signatures17 92 Tries to steal Mail credentials (via file / registry access) 31->92 94 Tries to harvest and steal browser information (history, passwords, etc) 31->94 96 Modifies the context of a thread in another process (thread injection) 31->96 98 2 other signatures 31->98 34 WDCKCtpJetZZA3qs.exe 31->34 injected 38 firefox.exe 31->38         started        process18 dnsIp19 52 www.trust-systems.xyz 13.248.169.48, 49734, 80 AMAZON-02US United States 34->52 54 www.oren-burg.online 193.32.178.164, 80 AS40676US Russian Federation 34->54 80 Found direct / indirect Syscall (likely to bypass EDR) 34->80 signatures20
Score:
97%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/726f2791905623a92d53b886b253f9f5e187df7e31e0c2ff27fcf52c4667f0be
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/726f2791905623a92d53b886b253f9f5e187df7e31e0c2ff27fcf52c4667f0be/
Threat name:
Win32.Trojan.Guloader
Create hunting rule
Status:
Malicious
First seen:
2025-04-23 11:56:48 UTC
File Type:
PE (Exe)
Extracted files:
14
AV detection:
18 of 24 (75.00%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=ojxspemqkyr2slktxcdleu7z6xqypx36ghqmf7zh7t2syrth6c7a._file
Result
Malware family:
n/a
Score:
  8/10
Tags:
discovery execution persistence
Link:
https://tria.ge/reports/250509-q23znser5s/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
NSIS installer
Enumerates physical storage devices
System Location Discovery: System Language Discovery
Drops file in Program Files directory
Suspicious use of NtCreateThreadExHideFromDebugger
Suspicious use of NtSetInformationThreadHideFromDebugger
Legitimate hosting services abused for malware hosting/C2
Loads dropped DLL
Command and Scripting Interpreter: PowerShell
Verdict:
Malicious
Tags:
loader guloader
YARA:
NSIS_GuLoader_July_2024
Link:
https://app.threat.zone/submission/12599193-1e8b-4363-805d-054c3d6a929b
Unpacked files
SH256 hash:
726f2791905623a92d53b886b253f9f5e187df7e31e0c2ff27fcf52c4667f0be
MD5 hash:
3021ebb7a74c678861449923f5e0d312
SHA1 hash:
0536d9a5892ccb8e1f30608c9906cd6ec90d3c5f
Link:
https://www.unpac.me/results/f08eea1a-82d7-4aad-982a-0932a2686cdf/
Malware family:
FormBook
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/726f27919056/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/726f2791905623a92d53b886b253f9f5e187df7e31e0c2ff27fcf52c4667f0be

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: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.

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_AUTHENTICODEMissing Authenticodehigh
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