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MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 c39c110a99a370d96dc726eed2f9a98a3b57c68874f7ed098ca5631b5f9c8a0c. 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 3 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: c39c110a99a370d96dc726eed2f9a98a3b57c68874f7ed098ca5631b5f9c8a0c
SHA3-384 hash: 8e08776f6288ae950d668b76cb141aab3115a1e35ca0285bf9841652d0d519107f4f3d69c623ef0f6326745c1768f5ec
SHA1 hash: 0d9f7d0c7759d5121016adfc71808015381778f5
MD5 hash: 9cc1b4d0be8ba6595d067fec212a8d59
humanhash: sweet-jig-finch-berlin
File name:scan.exe
Download: download sample
Signature GuLoader
Create hunting rule
File size:765'248 bytes
First seen:2026-04-12 23:31:53 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f4639a0b3116c2cfc71144b88a929cfd (145 x GuLoader, 57 x Formbook, 47 x VIPKeylogger)
ssdeep 12288:aXyWmdPEZJ7SyplVh6GIpCgEgpoNqTIqBPHg7Ibwix8:aXrmdPud3VhDIsgToNCnRHUix8
Threatray 1 similar samples on MalwareBazaar
TLSH T187F4F185B7409B77C22543354FD787A16339EC20AB929B2B7292F35E2FB23515A473C8
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 81e0f4f8e662b0b0 (3 x RemcosRAT, 2 x GuLoader)
Reporter threatcat_ch
Tags:exe GuLoader signed

Code Signing Certificate

Organisation:Nikkis
Issuer:Nikkis
Algorithm:sha256WithRSAEncryption
Valid from:2026-03-25T03:54:59Z
Valid to:2027-03-25T03:54:59Z
Serial number: 5e93a6b0fcca8bb47415b8421fa12e3e9f531e42
Thumbprint Algorithm:SHA256
Thumbprint: a7909b25e55655af0788d45f1fcae9b493cb3fb4d297f534f28426f70bd04f4f
Source:This information was brought to you by ReversingLabs A1000 Malware Analysis Platform

Intelligence

File Origin
# of uploads :
1
# of downloads :
188
Origin country :
CH CH
Vendor Threat Intelligence
Malware configuration found for:
GuLoader NSIS
Details
GuLoader
an XOR decryption key and an extracted component
GuLoader
a c2 URL, a useragent string, and a string XOR key
NSIS
extracted archive contents
Link:
https://research.acce.ciphertechsolutions.com/results/cc181bd0-4389-49a1-9e53-8bf083e8590a/
Malware family:
remcos
Create hunting rule
ID:
1
File name:
_c39c110a99a370d96dc726eed2f9a98a3b57c68874f7ed098ca5631b5f9c8a0c.exe
Verdict:
Malicious activity
Analysis date:
2026-04-12 23:32:43 UTC
Tags:
remcos rat auto-reg
Link:
https://app.any.run/tasks/382c8235-e0e0-4011-861d-9f4a6437b5a6

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/61296/
Verdict:
Malicious
Score:
81.4%
Link:
https://cyber-fortress.com/docs/result/index.php?id=69dc2b9245787c53e5392c0d
Tags:
injection obfusc
Result
Verdict:
Suspicious
Maliciousness:

Behaviour
Creating a window
Searching for the window
Creating a file
Creating a file in the %temp% directory
Delayed reading of the file
Launching a service
Unauthorized injection to a recently created process
Restart of the analyzed sample
DNS request
Connection attempt
Sending a custom TCP request
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
adaptive-context anti-debug installer installer installer-heuristic microsoft_visual_cc nsis signed soft-404
Link:
https://www.filescan.io/uploads/69dc2b8a5ea31bc68a240386/reports/8bdafb10-78a5-4cb2-9b7b-8779741d99d6/overview
Verdict:
Unknown
Link:
https://www.hybrid-analysis.com/sample/c39c110a99a370d96dc726eed2f9a98a3b57c68874f7ed098ca5631b5f9c8a0c
Verdict:
Malicious
File Type:
exe x32
First seen:
2026-04-12T19:44:00Z UTC
Last seen:
2026-04-14T21:36:00Z UTC
Hits:
~1000
Detections:
Trojan-Downloader.Win32.Minix.sb Backdoor.Win32.Remcos.sb Trojan.Win32.GuLoader.sb Trojan.NSIS.Makoob.sbb Trojan.NSIS.Makoob.sba HEUR:Trojan.Win32.Makoob.gen VHO:Trojan.NSIS.Makoob.gen
Link:
https://opentip.kaspersky.com/c39c110a99a370d96dc726eed2f9a98a3b57c68874f7ed098ca5631b5f9c8a0c/results?tab=lookup
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/f5a8f052-1e44-458b-8ca1-ecca21102e59
Result
Threat name:
GuLoader, Remcos
Create hunting rule
Detection:
malicious
Classification:
troj.evad.phis.spyw
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1897087
Signature
AI detected suspicious PE digital signature
Antivirus / Scanner detection for submitted sample
Antivirus detection for dropped file
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 hidden mapped module (file has been removed from disk)
Found malware configuration
Joe Sandbox ML detected suspicious sample
Maps a DLL or memory area into another process
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Sigma detected: Remcos
Suricata IDS alerts for network traffic
Switches to a custom stack to bypass stack traces
Tries to detect virtualization through RDTSC time measurements
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)
Unusual module load detection (module proxying)
Writes to foreign memory regions
Yara detected GuLoader
Yara detected Remcos RAT
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1897087 Sample: scan.exe Startdate: 13/04/2026 Architecture: WINDOWS Score: 100 69 drive.usercontent.google.com 2->69 71 drive.google.com 2->71 79 Suricata IDS alerts for network traffic 2->79 81 Found malware configuration 2->81 83 Antivirus detection for dropped file 2->83 85 9 other signatures 2->85 10 scan.exe 2 32 2->10         started        14 remcos.exe 21 2->14         started        16 remcos.exe 7 2->16         started        signatures3 process4 file5 63 C:\Users\user\AppData\Local\...\System.dll, PE32 10->63 dropped 99 Tries to detect virtualization through RDTSC time measurements 10->99 101 Unusual module load detection (module proxying) 10->101 103 Switches to a custom stack to bypass stack traces 10->103 18 scan.exe 2 10 10->18         started        23 scan.exe 10->23         started        65 C:\Users\user\AppData\Local\...\System.dll, PE32 14->65 dropped 105 Found direct / indirect Syscall (likely to bypass EDR) 14->105 25 remcos.exe 6 14->25         started        27 remcos.exe 14->27         started        signatures6 process7 dnsIp8 73 drive.google.com 142.251.211.174, 443, 49765, 49770 GOOGLEUS United States 18->73 75 drive.usercontent.google.com 142.251.211.193, 443, 49766, 49772 GOOGLEUS United States 18->75 53 C:\ProgramData\Remcos\remcos.exe, PE32 18->53 dropped 55 C:\ProgramData\...\remcos.exe:Zone.Identifier, ASCII 18->55 dropped 87 Detected Remcos RAT 18->87 89 Creates autostart registry keys with suspicious names 18->89 29 remcos.exe 21 18->29         started        33 scan.exe 18->33         started        91 Found direct / indirect Syscall (likely to bypass EDR) 25->91 35 remcos.exe 25->35         started        file9 signatures10 process11 file12 67 C:\Users\user\AppData\Local\...\System.dll, PE32 29->67 dropped 115 Antivirus detection for dropped file 29->115 117 Multi AV Scanner detection for dropped file 29->117 119 Found hidden mapped module (file has been removed from disk) 29->119 121 4 other signatures 29->121 37 remcos.exe 4 10 29->37         started        42 remcos.exe 29->42         started        signatures13 process14 dnsIp15 77 31.57.216.128, 2404, 49773, 49774 RASANAIR Iran (ISLAMIC Republic Of) 37->77 57 C:\Users\user\AppData\Local\Temp\TH3B46.tmp, MS-DOS 37->57 dropped 59 C:\Users\user\AppData\Local\Temp\TH3AE7.tmp, MS-DOS 37->59 dropped 61 C:\Users\user\AppData\Local\Temp\TH3A79.tmp, MS-DOS 37->61 dropped 93 Detected Remcos RAT 37->93 95 Writes to foreign memory regions 37->95 97 Maps a DLL or memory area into another process 37->97 44 userinit.exe 37->44         started        47 userinit.exe 37->47         started        49 userinit.exe 37->49         started        51 5 other processes 37->51 file16 signatures17 process18 signatures19 107 Tries to steal Instant Messenger accounts or passwords 44->107 109 Tries to steal Mail credentials (via file / registry access) 44->109 111 Tries to harvest and steal browser information (history, passwords, etc) 47->111 113 Unusual module load detection (module proxying) 49->113
Score:
97%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/c39c110a99a370d96dc726eed2f9a98a3b57c68874f7ed098ca5631b5f9c8a0c
Verdict:
inconclusive
YARA:
5 match(es)
Tags:
Executable NSIS Installer PE (Portable Executable) PE File Layout Win 32 Exe x86
Link:
https://app.malva.re/file/9cc1b4d0be8ba6595d067fec212a8d59
Detection:
remcos
Create hunting rule
Link:
https://mwdb.cert.pl/sample/c39c110a99a370d96dc726eed2f9a98a3b57c68874f7ed098ca5631b5f9c8a0c/
Verdict:
Malicious
Threat:
Family.REMCOS
Link:
https://tip.neiki.dev/file/c39c110a99a370d96dc726eed2f9a98a3b57c68874f7ed098ca5631b5f9c8a0c
Threat name:
Win32.Trojan.Qwexlafiba
Create hunting rule
Status:
Malicious
First seen:
2026-04-12 23:00:57 UTC
File Type:
PE (Exe)
Extracted files:
9
AV detection:
17 of 24 (70.83%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=yoobccuzunyns3ohe3xnf6njri5vpruiot362cmmuvrrwx44riga._file
Verdict:
malicious
Label(s):
cloudeye
Create hunting rule
Similar samples:
error
GuLoader
Result
Malware family:
remcos
Create hunting rule
Score:
  10/10
Tags:
family:remcos botnet:remotehost collection discovery persistence rat
Link:
https://tria.ge/reports/260412-3jgd6sax7s/
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
Suspicious use of SetThreadContext
Accesses Microsoft Outlook accounts
Adds Run key to start application
Contacts third-party web service commonly abused for C2
Checks computer location settings
Executes dropped EXE
Loads dropped DLL
Detected Nirsoft tools
Remcos
Remcos family
Malware Config
C2 Extraction:
31.57.216.128:2404
Unpacked files
SH256 hash:
c39c110a99a370d96dc726eed2f9a98a3b57c68874f7ed098ca5631b5f9c8a0c
MD5 hash:
9cc1b4d0be8ba6595d067fec212a8d59
SHA1 hash:
0d9f7d0c7759d5121016adfc71808015381778f5
Link:
https://www.unpac.me/results/80cc2936-bfbd-4d1f-9b2c-2dfff62ea631/
SH256 hash:
23d618a0293c78ce00f7c6e6dd8b8923621da7dd1f63a070163ef4c0ec3033d6
MD5 hash:
192639861e3dc2dc5c08bb8f8c7260d5
SHA1 hash:
58d30e460609e22fa0098bc27d928b689ef9af78
Link:
https://www.unpac.me/results/80cc2936-bfbd-4d1f-9b2c-2dfff62ea631/
Malware family:
GuLoader
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/c39c110a99a3/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/c39c110a99a370d96dc726eed2f9a98a3b57c68874f7ed098ca5631b5f9c8a0c

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: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 c39c110a99a370d96dc726eed2f9a98a3b57c68874f7ed098ca5631b5f9c8a0c

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/61296/

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