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MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 fd44c9308e299cf5dc83456b7ce9f26ea014e0d36d3a2b5d9164c500c57e59ef. 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: 16


Intelligence 16 IOCs YARA 3 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: fd44c9308e299cf5dc83456b7ce9f26ea014e0d36d3a2b5d9164c500c57e59ef
SHA3-384 hash: 962473d392605f4046bf83fc14358cf57b53b678b31664778f311ad2841d399771de75f6a3e05601831df5c49835c9cf
SHA1 hash: 784ac653261811bc9b32e558194966e8beba73cb
MD5 hash: 48d49e577131b538a4aa4a57c09d62fa
humanhash: missouri-leopard-oranges-eleven
File name:Kollager.exe
Download: download sample
Signature GuLoader
Create hunting rule
File size:806'115 bytes
First seen:2026-05-04 01:31:29 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash 46ce5c12b293febbeb513b196aa7f843 (47 x GuLoader, 21 x RemcosRAT, 15 x AgentTesla)
ssdeep 12288:eX4sIaBiRH47lsKKm7aqo+QaXNsCWqM4invPlBofhcsRSGrNmc0BpYHz:g4LGXKm7XGbCWqM4MlYSpGrNl0PYT
Threatray 2'503 similar samples on MalwareBazaar
TLSH T16D0501E9F244D82BC8B24376DD72DBF5A2616D00EE026607A3D4BF5F343B5056A2B50B
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 c0d0c6ceecd4f118 (3 x GuLoader, 2 x RemcosRAT)
Reporter threatcat_ch
Tags:exe GuLoader

Intelligence

File Origin
# of uploads :
1
# of downloads :
188
Origin country :
CH CH
Vendor Threat Intelligence
Details
Link:
https://research.acce.ciphertechsolutions.com/results/7d1d70a4-27ed-422b-9598-4e33d2486362/
Malware family:
remcos
Create hunting rule
ID:
1
File name:
_fd44c9308e299cf5dc83456b7ce9f26ea014e0d36d3a2b5d9164c500c57e59ef.exe
Verdict:
Malicious activity
Analysis date:
2026-05-04 01:33:07 UTC
Tags:
remcos rat auto-reg
Link:
https://app.any.run/tasks/5e5b4e16-5087-4157-9ee1-ab596fa4bb31

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/64440/
Detection(s):
SecuriteInfo.com.FileRepMalware.35574958.UNOFFICIAL
Create hunting rule

Result
Verdict:
Clean
Maliciousness:

Behaviour
Creating a file in the %temp% directory
Creating a window
Searching for the window
Creating a file
Delayed reading of the file
Restart of the analyzed sample
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
adaptive-context anti-debug fingerprint installer installer installer-heuristic microsoft_visual_cc nsis soft-404
Link:
https://www.filescan.io/uploads/69f7f72d2fcb905ec27c63ab/reports/ae2cf700-c8d9-4ff7-bd3f-a6fa456a7312/overview
Verdict:
Suspicious
Labled as:
Malware_
Link:
https://www.hybrid-analysis.com/sample/fd44c9308e299cf5dc83456b7ce9f26ea014e0d36d3a2b5d9164c500c57e59ef
Verdict:
Malicious
File Type:
exe x32
First seen:
2026-05-03T21:02:00Z UTC
Last seen:
2026-05-05T23:33:00Z UTC
Hits:
~1000
Detections:
Trojan.NSIS.Makoob.sbb Trojan.NSIS.Makoob.sba Trojan-Downloader.Win32.Minix.sb VHO:Trojan-Downloader.Win32.Minix.cpy PDM:Trojan.Win32.Generic Trojan.Win32.Guloader.sb Trojan-Downloader.Win32.Minix.cpy VHO:Trojan-Downloader.Win32.Minix.gen
Link:
https://opentip.kaspersky.com/fd44c9308e299cf5dc83456b7ce9f26ea014e0d36d3a2b5d9164c500c57e59ef/results?tab=lookup
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/44d39588-38d7-4ae3-bb7e-bc83f48d4169
Result
Threat name:
GuLoader, Remcos
Create hunting rule
Detection:
malicious
Classification:
troj.evad.phis.spyw
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1907859
Signature
Antivirus detection for dropped file
C2 URLs / IPs found in malware configuration
Creates autostart registry keys with suspicious names
Detected Remcos RAT
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)
Tries to steal Mail credentials (via file registry)
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: 1907859 Sample: Kollager.exe Startdate: 04/05/2026 Architecture: WINDOWS Score: 100 79 drive.usercontent.google.com 2->79 81 drive.google.com 2->81 89 Suricata IDS alerts for network traffic 2->89 91 Found malware configuration 2->91 93 Antivirus detection for dropped file 2->93 95 7 other signatures 2->95 10 Kollager.exe 1 51 2->10         started        14 remcos.exe 28 2->14         started        16 remcos.exe 2->16         started        signatures3 process4 file5 63 C:\Users\user\AppData\Local\...\System.dll, PE32 10->63 dropped 65 C:\Users\user\AppData\Local\...\nsk4523.tmp, data 10->65 dropped 67 C:\Users\user\AppData\Local\...\Butcherbird, data 10->67 dropped 107 Tries to detect virtualization through RDTSC time measurements 10->107 109 Unusual module load detection (module proxying) 10->109 111 Switches to a custom stack to bypass stack traces 10->111 18 Kollager.exe 2 10 10->18         started        23 Kollager.exe 10->23         started        69 C:\Users\user\AppData\Local\...\System.dll, PE32 14->69 dropped 71 C:\Users\user\AppData\Local\...\nshEE54.tmp, data 14->71 dropped 25 remcos.exe 14->25         started        27 remcos.exe 14->27         started        73 C:\Users\user\AppData\Local\...\nsb2D60.tmp, data 16->73 dropped signatures6 process7 dnsIp8 83 drive.usercontent.google.com 142.251.211.193, 443, 49756, 49759 GOOGLEUS United States 18->83 85 drive.google.com 142.251.41.174, 443, 49755, 49758 GOOGLEUS United States 18->85 53 C:\ProgramData\Remcos\remcos.exe, PE32 18->53 dropped 55 C:\ProgramData\...\remcos.exe:Zone.Identifier, ASCII 18->55 dropped 97 Detected Remcos RAT 18->97 99 Creates autostart registry keys with suspicious names 18->99 29 remcos.exe 28 18->29         started        33 Kollager.exe 18->33         started        35 remcos.exe 25->35         started        file9 signatures10 process11 file12 75 C:\Users\user\AppData\Local\...\System.dll, PE32 29->75 dropped 77 C:\Users\user\AppData\Local\...\nsqC659.tmp, data 29->77 dropped 123 Multi AV Scanner detection for dropped file 29->123 125 Found hidden mapped module (file has been removed from disk) 29->125 127 Tries to detect virtualization through RDTSC time measurements 29->127 129 2 other signatures 29->129 37 remcos.exe 4 10 29->37         started        42 remcos.exe 29->42         started        signatures13 process14 dnsIp15 87 31.57.184.187, 2404, 49760, 49761 RASANAIR Iran (ISLAMIC Republic Of) 37->87 57 C:\Users\user\AppData\Local\Temp\TH75E4.tmp, MS-DOS 37->57 dropped 59 C:\Users\user\AppData\Local\Temp\TH75A4.tmp, MS-DOS 37->59 dropped 61 C:\Users\user\AppData\Local\Temp\TH7584.tmp, MS-DOS 37->61 dropped 101 Detected Remcos RAT 37->101 103 Writes to foreign memory regions 37->103 105 Maps a DLL or memory area into another process 37->105 44 RmClient.exe 37->44         started        47 RmClient.exe 37->47         started        49 RmClient.exe 37->49         started        51 remcos.exe 37->51         started        file16 signatures17 process18 signatures19 113 Tries to steal Mail credentials (via file registry) 44->113 115 Tries to harvest and steal browser information (history, passwords, etc) 44->115 117 Unusual module load detection (module proxying) 44->117 119 Tries to steal Instant Messenger accounts or passwords 47->119 121 Tries to steal Mail credentials (via file / registry access) 47->121
Score:
89%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/fd44c9308e299cf5dc83456b7ce9f26ea014e0d36d3a2b5d9164c500c57e59ef
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/48d49e577131b538a4aa4a57c09d62fa
Detection:
remcos
Create hunting rule
Link:
https://mwdb.cert.pl/sample/fd44c9308e299cf5dc83456b7ce9f26ea014e0d36d3a2b5d9164c500c57e59ef/
Verdict:
Malicious
Threat:
Family.REMCOS
Link:
https://tip.neiki.dev/file/fd44c9308e299cf5dc83456b7ce9f26ea014e0d36d3a2b5d9164c500c57e59ef
Threat name:
Win32.Trojan.Qwexlafiba
Create hunting rule
Status:
Malicious
First seen:
2026-05-04 00:05:17 UTC
File Type:
PE (Exe)
Extracted files:
20
AV detection:
17 of 38 (44.74%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=7vcmsmeofgoplxedivvxz2psn2qbjygtnu5cwxmrmtcqbrl6lhxq._file
Verdict:
malicious
Label(s):
cloudeye
Create hunting rule
Similar samples:
519ffa69c89f1f6ca85fc80f08b9d2cb7b731cdd5ebff1cf3221a4e5d0c46582
GuLoader
677fa0e6764f872b832bd199c317eb3f1c21ba43bedb239d9f5097836b9fb65c
GuLoader
bb4d1e87bbab26d77af028693d2a9a5fdad3942dbb461b1a4f132ce61dc2ff02
GuLoader
c9075edbd201388279ff4c32a3a4a85b6b0b1fd934383394f62a7131d5c6b5fb
GuLoader
e913b436fe3debd25ed0fa24e84e313f104490be66687a584f9cc15e0b23d9c8
GuLoader
error
GuLoader
+ 2'493 additional samples on MalwareBazaar
Result
Malware family:
remcos
Create hunting rule
Score:
  10/10
Tags:
family:remcos botnet:remotehost collection discovery persistence rat
Link:
https://tria.ge/reports/260504-bx7dzaex4j/
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 Program Files 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
Executes dropped EXE
Loads dropped DLL
Detected Nirsoft tools
NirSoft MailPassView
Family: Remcos
Malware Config
C2 Extraction:
31.57.184.187:2404
Unpacked files
SH256 hash:
fd44c9308e299cf5dc83456b7ce9f26ea014e0d36d3a2b5d9164c500c57e59ef
MD5 hash:
48d49e577131b538a4aa4a57c09d62fa
SHA1 hash:
784ac653261811bc9b32e558194966e8beba73cb
Link:
https://www.unpac.me/results/c2fd383a-8c57-4116-a8c7-6e4ddb0c0804/
SH256 hash:
8b4c47c4cf5e76ec57dd5a050d5acd832a0d532ee875d7b44f6cdaf68f90d37c
MD5 hash:
9b38a1b07a0ebc5c7e59e63346ecc2db
SHA1 hash:
97332a2ffcf12a3e3f27e7c05213b5d7faa13735
Link:
https://www.unpac.me/results/c2fd383a-8c57-4116-a8c7-6e4ddb0c0804/
Malware family:
GuLoader
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/fd44c9308e29/report/overview.html
Please note that we are no longer able to provide a coverage score for Virus Total.

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:AgentTesla_HighConfidence
Create hunting rule
Author:Arrbat
Description:High-confidence detection using unique .NET loader/reflection stubs (Moonshine), NSIS manifests, specific typo/junk strings, and repeating patterns from observed samples. Low FP.
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 fd44c9308e299cf5dc83456b7ce9f26ea014e0d36d3a2b5d9164c500c57e59ef

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/64440/

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