MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 c71ca97fb470588c724cd4301370922770da3221b7db015ae862f8d840297f50. 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: 15


Intelligence 15 IOCs YARA 3 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: c71ca97fb470588c724cd4301370922770da3221b7db015ae862f8d840297f50
SHA3-384 hash: 1ce7eb1f2614d1e1ebc313b1bf19ee9f6b61652a7ad6a9d47be772b857f926b891b091006728ec6380417216f4cafd95
SHA1 hash: 76555f4385ff588482bafba79e760009860e9a24
MD5 hash: cd407112f5311b9a7b1cbc7fe45e6772
humanhash: butter-aspen-missouri-vermont
File name:RFQ-0000032993030-PDF.exe
Download: download sample
Signature GuLoader
Create hunting rule
File size:963'816 bytes
First seen:2025-07-30 02:10:44 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash 84062c623770f0d888e4ca58451aa7ad (10 x GuLoader, 1 x Formbook, 1 x RemcosRAT)
ssdeep 24576:qFZJQ/QR+NGbuuMC50ngH2ekZm+O3X/8Um:q3JQ/AbYkH2ekZmr3kD
TLSH T1902512197695E16ACA1E02B40F71C37013B47D082889AB777BF4BF0F79366D42A3D296
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 b9b0f8ecbcbcda72 (2 x GuLoader)
Reporter threatcat_ch
Tags:exe RemcosRAT signed

Code Signing Certificate

Organisation:Unrepentantly
Issuer:Unrepentantly
Algorithm:sha256WithRSAEncryption
Valid from:2024-08-03T06:10:49Z
Valid to:2025-11-06T06:10:49Z
Serial number: 3cf69d6324c19ef4b448bae078e492d5113fc872
Thumbprint Algorithm:SHA256
Thumbprint: 858523899c4cb406b5c14c5c53cfaf3f63c5fd77e1eca75bff33fe9976cf5283
Source:This information was brought to you by ReversingLabs A1000 Malware Analysis Platform

Intelligence

File Origin
# of uploads :
1
# of downloads :
73
Origin country :
CH CH
Vendor Threat Intelligence
Malware family:
remcos
Create hunting rule
ID:
1
File name:
RFQ-0000032993030-PDF.exe
Verdict:
Malicious activity
Analysis date:
2025-07-30 02:13:36 UTC
Tags:
rat remcos remote
Link:
https://app.any.run/tasks/bb38a4d6-0cab-42c2-b198-37c13668b354

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/17698/
Verdict:
Malicious
Score:
94.9%
Link:
https://cyber-fortress.com/docs/result/index.php?id=68897f3f0b4775fb21335a70
Tags:
injection obfusc crypt
Result
Verdict:
Clean
Maliciousness:

Behaviour
Creating a file in the %temp% directory
Creating a window
Searching for the window
Creating a file
Launching a process
Sending a custom TCP request
Using the Windows Management Instrumentation requests
Verdict:
Likely Malicious
Threat level:
  7.5/10
Confidence:
100%
Tags:
adaptive-context anti-debug blackhole installer microsoft_visual_cc overlay overlay phishing signed
Link:
https://www.filescan.io/uploads/68897f3e13488cfd44df98b6/reports/05f57fe3-f2bb-4a5d-96ad-2a5a908ae4ab/overview
Verdict:
Malicious
Labled as:
Win/malicious_confidence_70%
Link:
https://www.hybrid-analysis.com/sample/c71ca97fb470588c724cd4301370922770da3221b7db015ae862f8d840297f50
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/cd609fec-91d2-43e3-9bd9-9ddb8152a1a4
Result
Threat name:
Remcos
Create hunting rule
Detection:
malicious
Classification:
evad.phis.troj.spyw
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1746845
Signature
AI detected suspicious PE digital signature
Antivirus detection for dropped file
C2 URLs / IPs found in malware configuration
Detected Remcos RAT
Early bird code injection technique detected
Found hidden mapped module (file has been removed from disk)
Found malware configuration
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
Maps a DLL or memory area into another process
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Powershell drops PE file
Queues an APC in another process (thread injection)
Sigma detected: Remcos
Suricata IDS alerts for network traffic
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)
Tries to steal Mail credentials (via file registry)
Writes to foreign memory regions
Yara detected Remcos RAT
Yara detected WebBrowserPassView password recovery tool
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1746845 Sample: RFQ-0000032993030-PDF.exe Startdate: 30/07/2025 Architecture: WINDOWS Score: 100 41 geoplugin.net 2->41 43 drive.usercontent.google.com 2->43 45 drive.google.com 2->45 61 Suricata IDS alerts for network traffic 2->61 63 Found malware configuration 2->63 65 Antivirus detection for dropped file 2->65 67 9 other signatures 2->67 9 RFQ-0000032993030-PDF.exe 4 22 2->9         started        signatures3 process4 process5 11 powershell.exe 30 9->11         started        file6 37 C:\Users\user\...\RFQ-0000032993030-PDF.exe, PE32 11->37 dropped 39 RFQ-0000032993030-...exe:Zone.Identifier, ASCII 11->39 dropped 77 Early bird code injection technique detected 11->77 79 Writes to foreign memory regions 11->79 81 Found suspicious powershell code related to unpacking or dynamic code loading 11->81 83 3 other signatures 11->83 15 msiexec.exe 4 18 11->15         started        20 conhost.exe 11->20         started        signatures7 process8 dnsIp9 47 196.251.81.212, 2404, 49753, 49754 SONIC-WirelessZA Seychelles 15->47 49 drive.google.com 142.250.176.206, 443, 49751 GOOGLEUS United States 15->49 51 2 other IPs or domains 15->51 31 C:\Users\user\AppData\Local\Temp\TH7562.tmp, MS-DOS 15->31 dropped 33 C:\Users\user\AppData\Local\Temp\TH7513.tmp, MS-DOS 15->33 dropped 35 C:\Users\user\AppData\Local\Temp\TH74B4.tmp, PE32 15->35 dropped 53 Detected Remcos RAT 15->53 55 Writes to foreign memory regions 15->55 57 Found hidden mapped module (file has been removed from disk) 15->57 59 Maps a DLL or memory area into another process 15->59 22 svchost.exe 14 15->22         started        25 svchost.exe 1 15->25         started        27 svchost.exe 1 15->27         started        29 conhost.exe 15->29         started        file10 signatures11 process12 signatures13 69 Tries to steal Mail credentials (via file registry) 22->69 71 Tries to harvest and steal browser information (history, passwords, etc) 22->71 73 Tries to steal Instant Messenger accounts or passwords 25->73 75 Tries to steal Mail credentials (via file / registry access) 27->75
Score:
92%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/c71ca97fb470588c724cd4301370922770da3221b7db015ae862f8d840297f50
Gathering data
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/c71ca97fb470588c724cd4301370922770da3221b7db015ae862f8d840297f50/
Verdict:
Malicious
Threat:
Trojan.NSIS.Makoob
Link:
https://tip.neiki.dev/file/c71ca97fb470588c724cd4301370922770da3221b7db015ae862f8d840297f50
Threat name:
Win32.Trojan.Guloader
Create hunting rule
Status:
Malicious
First seen:
2025-07-30 02:11:08 UTC
File Type:
PE (Exe)
Extracted files:
6
AV detection:
17 of 24 (70.83%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=y4oks75uobmiy4sm2qybg4ese5ynumrbw7nqcwximl4nqqbjp5ia._file
Result
Malware family:
remcos
Create hunting rule
Score:
  10/10
Tags:
family:guloader family:remcos botnet:remotehost discovery downloader execution rat
Link:
https://tria.ge/reports/250730-cmbd8avmv5/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
Suspicious use of SendNotifyMessage
Suspicious use of WriteProcessMemory
Command and Scripting Interpreter: PowerShell
Enumerates physical storage devices
Program crash
System Location Discovery: System Language Discovery
Drops file in Windows directory
Drops file in System32 directory
Suspicious use of NtCreateThreadExHideFromDebugger
Suspicious use of NtSetInformationThreadHideFromDebugger
Blocklisted process makes network request
Legitimate hosting services abused for malware hosting/C2
Guloader family
Guloader,Cloudeye
Remcos
Remcos family
Malware Config
C2 Extraction:
196.251.81.212:2404
Verdict:
Malicious
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/8db817fb-06f2-4a81-93b8-69e11dd74a3e
Unpacked files
SH256 hash:
c71ca97fb470588c724cd4301370922770da3221b7db015ae862f8d840297f50
MD5 hash:
cd407112f5311b9a7b1cbc7fe45e6772
SHA1 hash:
76555f4385ff588482bafba79e760009860e9a24
Link:
https://www.unpac.me/results/62756226-a06e-4cc2-b129-62ed4098f598/
Malware family:
Remcos
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/c71ca97fb470/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/c71ca97fb470588c724cd4301370922770da3221b7db015ae862f8d840297f50

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_NSIS_Nullsoft_Installer
Create hunting rule
Author:Obscurity Labs LLC
Description:Detects NSIS installers by .ndata section + NSIS header string
Rule name:PE_Digital_Certificate
Create hunting rule
Author:albertzsigovits
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 c71ca97fb470588c724cd4301370922770da3221b7db015ae862f8d840297f50

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/17698/

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
ADVAPI32.dll::SetFileSecurityW
SHELL_APIManipulates System ShellSHELL32.dll::ShellExecuteExW
SHELL32.dll::SHFileOperationW
SHELL32.dll::SHGetFileInfoW
WIN32_PROCESS_APICan Create Process and ThreadsKERNEL32.dll::CreateProcessW
ADVAPI32.dll::OpenProcessToken
KERNEL32.dll::CloseHandle
KERNEL32.dll::CreateThread
WIN_BASE_APIUses Win Base APIKERNEL32.dll::LoadLibraryExW
KERNEL32.dll::GetDiskFreeSpaceW
KERNEL32.dll::GetCommandLineW
WIN_BASE_IO_APICan Create FilesKERNEL32.dll::CopyFileW
KERNEL32.dll::CreateDirectoryW
KERNEL32.dll::CreateFileW
KERNEL32.dll::DeleteFileW
KERNEL32.dll::MoveFileW
KERNEL32.dll::MoveFileExW
WIN_BASE_USER_APIRetrieves Account InformationADVAPI32.dll::LookupPrivilegeValueW
WIN_REG_APICan Manipulate Windows RegistryADVAPI32.dll::RegCreateKeyExW
ADVAPI32.dll::RegDeleteKeyW
ADVAPI32.dll::RegOpenKeyExW
ADVAPI32.dll::RegQueryValueExW
ADVAPI32.dll::RegSetValueExW
WIN_USER_APIPerforms GUI ActionsUSER32.dll::AppendMenuW
USER32.dll::EmptyClipboard
USER32.dll::FindWindowExW
USER32.dll::OpenClipboard
USER32.dll::PeekMessageW
USER32.dll::CreateWindowExW

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