MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 39c0135a0e8d46053fbcaa4efe6cbc83d33cf8e7be43efbca1622b2f77c7b9c6. 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: 18


Intelligence 18 IOCs YARA 2 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 39c0135a0e8d46053fbcaa4efe6cbc83d33cf8e7be43efbca1622b2f77c7b9c6
SHA3-384 hash: 87e9a69cc0c42627e16fce4b107d4efd2d4b5e0327e251f8d5e662bc544f5593aada3ef81bb55da055980ccebf1d78ab
SHA1 hash: 35598ba9c5fe760a427ea07fd2a3f72c5ec765c9
MD5 hash: 7d784ec37ec7bcac8a9c735a35b06449
humanhash: kentucky-skylark-hot-arizona
File name:RFQ__________pdf.exe
Download: download sample
Signature GuLoader
Create hunting rule
File size:1'043'029 bytes
First seen:2026-04-27 00:42:59 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash 573bb7b41bc641bd95c0f5eec13c233b (38 x GuLoader, 21 x RemcosRAT, 16 x VIPKeylogger)
ssdeep 24576:yTAUoiC4oE/d+bgP1h5C5gf/pAKXN3mbbcz6s5:wDZ/d+bgf5CufBtdWbbcWy
TLSH T1432512C47347B291CEE8357439B59EBE498C7C6B89A115036A407E7BAF3C1064B4F26A
TrID 50.3% (.EXE) Win32 Executable MS Visual C++ (generic) (31206/45/13)
10.6% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
10.5% (.EXE) Win64 Executable (generic) (6522/11/2)
8.1% (.EXE) Win16 NE executable (generic) (5038/12/1)
7.2% (.EXE) Win32 Executable (generic) (4504/4/1)
Magika pebin
dhash icon e4c2f9f974fcbc58 (1 x GuLoader)
Reporter threatcat_ch
Tags:exe GuLoader

Intelligence

File Origin
# of uploads :
1
# of downloads :
146
Origin country :
CH CH
Vendor Threat Intelligence
Malware configuration found for:
GuLoader NSIS
Details
GuLoader
a c2 URL, a useragent string, and a string XOR key
GuLoader
an XOR decryption key and an extracted component
NSIS
extracted archive contents
Link:
https://research.acce.ciphertechsolutions.com/results/0f54bbf9-dff7-45d9-b77a-2f5018dda7a2/
Malware family:
remcos
Create hunting rule
ID:
1
File name:
exe
Verdict:
Malicious activity
Analysis date:
2026-04-27 00:46:20 UTC
Tags:
auto-reg rat remcos remote stealer mpress
Link:
https://app.any.run/tasks/8a8f7467-7381-44ca-936a-4e23663358a9

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
Guloader
Create hunting rule
Link:
https://www.capesandbox.com/analysis/63709/
Verdict:
Malicious
Score:
96.5%
Link:
https://cyber-fortress.com/docs/result/index.php?id=69eeb12d51cce3ff70305380
Tags:
underscore injection obfusc virus
Result
Verdict:
Clean
Maliciousness:

Behaviour
Creating a window
Searching for the window
Creating a file in the %AppData% subdirectories
Creating a file in the %temp% directory
Delayed reading of the file
Creating a file
DNS request
Unauthorized injection to a recently created process
Restart of the analyzed sample
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
adaptive-context anti-debug installer installer installer-heuristic masquerade microsoft_visual_cc nsis soft-404 unsafe
Link:
https://www.filescan.io/uploads/69eeb1188a82359247b42699/reports/8172c74a-1f8e-40b6-a125-f91ae3bbf99a/overview
Verdict:
Suspicious
Labled as:
Malware_
Link:
https://www.hybrid-analysis.com/sample/39c0135a0e8d46053fbcaa4efe6cbc83d33cf8e7be43efbca1622b2f77c7b9c6
Result
Gathering data
Verdict:
Malicious
File Type:
exe x32
First seen:
2026-04-26T19:44:00Z UTC
Last seen:
2026-04-26T21:47:00Z UTC
Hits:
~100
Link:
https://opentip.kaspersky.com/39c0135a0e8d46053fbcaa4efe6cbc83d33cf8e7be43efbca1622b2f77c7b9c6/results?tab=lookup
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/2b563347-c4c6-4aec-b812-5050e0ce7ef7
Result
Threat name:
Remcos
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1904872
Signature
C2 URLs / IPs found in malware configuration
Creates autostart registry keys with suspicious names
Detected Remcos RAT
Found direct / indirect Syscall (likely to bypass EDR)
Found malware configuration
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
Switches to a custom stack to bypass stack traces
Tries to detect virtualization through RDTSC time measurements
Unusual module load detection (module proxying)
Yara detected Remcos RAT
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1904872 Sample: RFQ__________pdf.exe Startdate: 27/04/2026 Architecture: WINDOWS Score: 100 55 31.57.184.186 RASANAIR Iran (ISLAMIC Republic Of) 2->55 57 drive.usercontent.google.com 2->57 59 drive.google.com 2->59 67 Found malware configuration 2->67 69 Multi AV Scanner detection for submitted file 2->69 71 Yara detected Remcos RAT 2->71 73 2 other signatures 2->73 10 RFQ__________pdf.exe 2 46 2->10         started        14 remcos.exe 12 2->14         started        16 remcos.exe 2->16         started        signatures3 process4 file5 51 C:\Users\user\AppData\Local\...\System.dll, PE32 10->51 dropped 89 Tries to detect virtualization through RDTSC time measurements 10->89 91 Unusual module load detection (module proxying) 10->91 93 Switches to a custom stack to bypass stack traces 10->93 95 Found direct / indirect Syscall (likely to bypass EDR) 10->95 18 RFQ__________pdf.exe 2 10 10->18         started        23 RFQ__________pdf.exe 10->23         started        signatures6 process7 dnsIp8 61 drive.google.com 142.251.2.113, 443, 49722 GOOGLEUS United States 18->61 63 drive.usercontent.google.com 74.125.137.132, 443, 49723 GOOGLEUS United States 18->63 45 C:\ProgramData\Remcos\remcos.exe, PE32 18->45 dropped 47 C:\ProgramData\...\remcos.exe:Zone.Identifier, ASCII 18->47 dropped 75 Detected Remcos RAT 18->75 77 Creates autostart registry keys with suspicious names 18->77 79 Found direct / indirect Syscall (likely to bypass EDR) 18->79 25 remcos.exe 27 18->25         started        29 RFQ__________pdf.exe 18->29         started        file9 signatures10 process11 file12 49 C:\Users\user\AppData\Local\...\System.dll, PE32 25->49 dropped 81 Multi AV Scanner detection for dropped file 25->81 83 Tries to detect virtualization through RDTSC time measurements 25->83 85 Switches to a custom stack to bypass stack traces 25->85 87 Found direct / indirect Syscall (likely to bypass EDR) 25->87 31 remcos.exe 27 25->31         started        35 remcos.exe 25->35         started        signatures13 process14 file15 53 C:\Users\user\AppData\Local\...\System.dll, PE32 31->53 dropped 65 Found direct / indirect Syscall (likely to bypass EDR) 31->65 37 remcos.exe 31->37         started        39 remcos.exe 31->39         started        41 remcos.exe 31->41         started        43 26 other processes 31->43 signatures16 process17
Score:
98%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/39c0135a0e8d46053fbcaa4efe6cbc83d33cf8e7be43efbca1622b2f77c7b9c6
Gathering data
Detection:
remcos
Create hunting rule
Link:
https://mwdb.cert.pl/sample/39c0135a0e8d46053fbcaa4efe6cbc83d33cf8e7be43efbca1622b2f77c7b9c6/
Verdict:
Malicious
Threat:
Family.REMCOS
Link:
https://tip.neiki.dev/file/39c0135a0e8d46053fbcaa4efe6cbc83d33cf8e7be43efbca1622b2f77c7b9c6
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=hhabgwqorvdakp54vjhp43f4qpjtz6hhxzb67pfbmivs656hxhda._file
Verdict:
malicious
Label(s):
remcos
Create hunting rule
Similar samples:
error
GuLoader
Result
Malware family:
remcos
Create hunting rule
Score:
  10/10
Tags:
family:remcos botnet:remotehost discovery persistence rat spyware stealer
Link:
https://tria.ge/reports/260427-a249qsdw4q/
Behaviour
Suspicious behavior: MapViewOfSection
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
System Location Discovery: System Language Discovery
Drops file in Program Files directory
Suspicious use of NtCreateThreadExHideFromDebugger
Suspicious use of NtSetInformationThreadHideFromDebugger
Adds Run key to start application
Checks installed software on the system
Contacts third-party web service commonly abused for C2
Checks computer location settings
Executes dropped EXE
Loads dropped DLL
Reads user/profile data of web browsers
Family: Remcos
Malware Config
C2 Extraction:
31.57.184.186:2404
Unpacked files
SH256 hash:
39c0135a0e8d46053fbcaa4efe6cbc83d33cf8e7be43efbca1622b2f77c7b9c6
MD5 hash:
7d784ec37ec7bcac8a9c735a35b06449
SHA1 hash:
35598ba9c5fe760a427ea07fd2a3f72c5ec765c9
Link:
https://www.unpac.me/results/1288943f-77fd-44fa-a556-027508158527/
SH256 hash:
8b4c47c4cf5e76ec57dd5a050d5acd832a0d532ee875d7b44f6cdaf68f90d37c
MD5 hash:
9b38a1b07a0ebc5c7e59e63346ecc2db
SHA1 hash:
97332a2ffcf12a3e3f27e7c05213b5d7faa13735
Link:
https://www.unpac.me/results/1288943f-77fd-44fa-a556-027508158527/
Malware family:
GuLoader
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/39c0135a0e8d/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/39c0135a0e8d46053fbcaa4efe6cbc83d33cf8e7be43efbca1622b2f77c7b9c6

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:VECT_Ransomware
Create hunting rule
Author:Mustafa Bakhit
Description:Detects activity associated with VECT ransomware. This includes registry modifications and deletions, execution of system and defense-evasion commands, suspicious API usage, mutex creation, file and memory manipulation, ransomware note generation, anti-debugging and anti-analysis techniques, and embedded cryptographic constants (SHA256) characteristic of this malware family. Designed for threat intelligence and malware detection environments.

File information

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

Malspam

GuLoader

Executable exe 39c0135a0e8d46053fbcaa4efe6cbc83d33cf8e7be43efbca1622b2f77c7b9c6

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/63709/

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