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MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 fd01d87191d287eef1b56ad193c9be2ab4abe4db90fa948b96ae5e69feb7792d. 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 4 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: fd01d87191d287eef1b56ad193c9be2ab4abe4db90fa948b96ae5e69feb7792d
SHA3-384 hash: 241409d7abe97a950ff0cfb3e3b34f1d83b469f037256fd5d508b6e9435d0ca6e0465a988f17e9b3ef89c4fcbb7da395
SHA1 hash: a8c58d6f33568587a93002be32dfb2d365f2ee6a
MD5 hash: 201c51b293f4cfca1b3d24ce1839b6b2
humanhash: magazine-delaware-golf-batman
File name:Appointment Confirmation Letter-1853013-1-PDF.exe
Download: download sample
Signature GuLoader
Create hunting rule
File size:823'088 bytes
First seen:2025-10-02 05:17:36 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash 56a78d55f3f7af51443e58e0ce2fb5f6 (739 x GuLoader, 453 x Formbook, 295 x Loki)
ssdeep 24576:AbsJmfnxJPgeKNA5RigtiABYj4Mp7qQ1YtyergWQ:KsJmZKeKNO9t3BY807P1YserO
Threatray 1'746 similar samples on MalwareBazaar
TLSH T140052311BB94D06BE6B007714622EE125771ADB66A30971F5324BE2F1FB2343073E3A2
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 70e2e171c9e2f85c (1 x GuLoader)
Reporter threatcat_ch
Tags:exe GuLoader signed

Code Signing Certificate

Organisation:Poodler
Issuer:Poodler
Algorithm:sha256WithRSAEncryption
Valid from:2025-09-07T23:34:14Z
Valid to:2026-09-07T23:34:14Z
Serial number: 47cd0f5f89fbb0cf71ea84595114da528783ba06
Thumbprint Algorithm:SHA256
Thumbprint: 4ff71fe35e3f85b956a1fb0f1aedbdbef8c40b8f93fd65975cf13e24f991eb1c
Source:This information was brought to you by ReversingLabs A1000 Malware Analysis Platform

Intelligence

File Origin
# of uploads :
1
# of downloads :
155
Origin country :
CH CH
Vendor Threat Intelligence
Malware family:
remcos
Create hunting rule
ID:
1
File name:
Appointment Confirmation Letter-1853013-1-PDF.exe
Verdict:
Malicious activity
Analysis date:
2025-10-02 05:20:04 UTC
Tags:
rat remcos auto-reg
Link:
https://app.any.run/tasks/9b3b6951-2468-4b07-87c1-740f085f7d2f

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/29871/
Verdict:
Malicious
Score:
96.5%
Link:
https://cyber-fortress.com/docs/result/index.php?id=68de0b28b54520161ad44d04
Tags:
injection virus blic
Result
Verdict:
Suspicious
Maliciousness:

Behaviour
Creating a window
Searching for the window
Creating a file in the %temp% subdirectories
Creating a file in the %AppData% subdirectories
Creating a file
Launching a process
Creating a process with a hidden window
Sending a custom TCP request
Using the Windows Management Instrumentation requests
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
adaptive-context anti-debug blackhole installer microsoft_visual_cc nemesis nsis overlay signed unsafe
Link:
https://www.filescan.io/uploads/68de0af9674d5fd6aa134099/reports/574c3d47-38bd-4c7e-b3e2-197f42c092d8/overview
Verdict:
Malicious
Labled as:
Injector.SUMW
Link:
https://www.hybrid-analysis.com/sample/fd01d87191d287eef1b56ad193c9be2ab4abe4db90fa948b96ae5e69feb7792d
Verdict:
Malicious
File Type:
exe x32
First seen:
2025-10-01T23:21:00Z UTC
Last seen:
2025-10-04T01:25:00Z UTC
Hits:
~100
Detections:
Trojan.NSIS.Makoob.sbb Trojan.NSIS.Makoob.sba HEUR:Trojan.Win32.Makoob.gen
Link:
https://opentip.kaspersky.com/fd01d87191d287eef1b56ad193c9be2ab4abe4db90fa948b96ae5e69feb7792d/results?tab=lookup
Verdict:
Suspicious
Link:
https://analyze.intezer.com/analyses/dc8990d9-666d-4b1a-b782-4cbfab51b67c
Result
Threat name:
GuLoader, Remcos
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1787853
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
Early bird code injection technique detected
Found malware configuration
Found suspicious powershell code related to unpacking or dynamic code loading
Hides threads from debuggers
Joe Sandbox ML detected suspicious sample
Loading BitLocker PowerShell Module
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: Suspicious Script Execution From Temp Folder
Writes to foreign memory regions
Yara detected GuLoader
Yara detected Remcos RAT
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1787853 Sample: Appointment Confirmation Le... Startdate: 02/10/2025 Architecture: WINDOWS Score: 100 39 161.248.179.190 BPL-ASNUS unknown 2->39 41 drive.usercontent.google.com 2->41 43 drive.google.com 2->43 49 Found malware configuration 2->49 51 Antivirus detection for dropped file 2->51 53 Antivirus / Scanner detection for submitted sample 2->53 55 8 other signatures 2->55 9 Appointment Confirmation Letter-1853013-1-PDF.exe 2 57 2->9         started        12 remcos.exe 2->12         started        14 remcos.exe 2->14         started        16 remcos.exe 2->16         started        signatures3 process4 file5 37 C:\Users\user\AppData\...\Saldoliste.Kra, ASCII 9->37 dropped 18 powershell.exe 30 9->18         started        process6 file7 31 Appointment Confir...r-1853013-1-PDF.exe, PE32 18->31 dropped 33 Appointment Confir...exe:Zone.Identifier, ASCII 18->33 dropped 57 Early bird code injection technique detected 18->57 59 Writes to foreign memory regions 18->59 61 Found suspicious powershell code related to unpacking or dynamic code loading 18->61 63 3 other signatures 18->63 22 msiexec.exe 2 9 18->22         started        27 conhost.exe 18->27         started        signatures8 process9 dnsIp10 45 drive.google.com 142.251.35.174, 443, 49763 GOOGLEUS United States 22->45 47 drive.usercontent.google.com 142.251.40.161, 443, 49764 GOOGLEUS United States 22->47 35 C:\ProgramData\Remcos\remcos.exe, PE32 22->35 dropped 65 Detected Remcos RAT 22->65 67 Creates autostart registry keys with suspicious names 22->67 69 Hides threads from debuggers 22->69 29 remcos.exe 22->29         started        file11 signatures12 process13
Score:
93%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/fd01d87191d287eef1b56ad193c9be2ab4abe4db90fa948b96ae5e69feb7792d
Gathering data
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/fd01d87191d287eef1b56ad193c9be2ab4abe4db90fa948b96ae5e69feb7792d/
Verdict:
Malicious
Threat:
Family.REMCOS
Link:
https://tip.neiki.dev/file/fd01d87191d287eef1b56ad193c9be2ab4abe4db90fa948b96ae5e69feb7792d
Threat name:
Win32.Trojan.Guloader
Create hunting rule
Status:
Malicious
First seen:
2025-10-02 02:26:25 UTC
File Type:
PE (Exe)
Extracted files:
16
AV detection:
16 of 24 (66.67%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=7ua5q4mr2kd654nvnlizhsn6fk2kxzg3sd5jjc4wvzpgt7vxpewq._file
Verdict:
malicious
Label(s):
cloudeye
Create hunting rule
Similar samples:
2be5b104a63deb6addd9d49ffea10cfbefc8c214c2578f4554b6272ca3856899
GuLoader
4d02f3763b13495b4365c2ea7bd38bcb14b3163b7b6a3962fe4a7f5898235451
GuLoader
55d8dc6d475a919fe7ec17bd2575cf0f0a1eec913dba89f9556b69621eec0eb6
GuLoader
5dfcdc1c491fbf2f7f2fbac6bbf27b84be652583b66b252c46e8ed86577c3c60
GuLoader
67fd31f9b85ca5e31e0851c8a5f8f2f36343d884aa3dd7f26d4aa6c5d02b28fe
GuLoader
789adbc44cc154330a9ed757b4c8e31e70c4c9398792da1f9595df5432c9fd26
GuLoader
dd6d8363c2761f77948a54be192dbbe563d2da9dd8f922102547631ccbd05ebb
GuLoader
e715ca77bca80baec611ba2f5982ce26a52211523f2db2115165e593b65ff6ef
GuLoader
error
GuLoader
+ 1'736 additional samples on MalwareBazaar
Result
Malware family:
remcos
Create hunting rule
Score:
  10/10
Tags:
family:remcos adware discovery execution persistence ransomware rat spyware
Link:
https://tria.ge/reports/251002-fy4fxssny7/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Command and Scripting Interpreter: PowerShell
Enumerates physical storage devices
System Location Discovery: System Language Discovery
Drops file in Windows directory
Suspicious use of NtCreateThreadExHideFromDebugger
Suspicious use of NtSetInformationThreadHideFromDebugger
Adds Run key to start application
Badlisted process makes network request
Legitimate hosting services abused for malware hosting/C2
Checks computer location settings
Executes dropped EXE
Remcos
Remcos family
Malware Config
C2 Extraction:
161.248.179.190:2404
Verdict:
Unknown
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/126ea5dd-abd7-4ead-a618-5267aba7bef7
Unpacked files
SH256 hash:
fd01d87191d287eef1b56ad193c9be2ab4abe4db90fa948b96ae5e69feb7792d
MD5 hash:
201c51b293f4cfca1b3d24ce1839b6b2
SHA1 hash:
a8c58d6f33568587a93002be32dfb2d365f2ee6a
Link:
https://www.unpac.me/results/8d3f2c44-22f2-4f8f-b59f-e633b3cc58e5/
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/fd01d87191d2/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/fd01d87191d287eef1b56ad193c9be2ab4abe4db90fa948b96ae5e69feb7792d

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:CP_AllMal_Detector
Create hunting rule
Author:DiegoAnalytics
Description:CrossPlatform All Malwares Detector: Detect PE, ELF, Mach-O, scripts, archives; overlay, obfuscation, encryption, spoofing, hiding, high entropy, network communication
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:shellcode
Create hunting rule
Author:nex
Description:Matched shellcode byte patterns

File information

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

Malspam

GuLoader

Executable exe fd01d87191d287eef1b56ad193c9be2ab4abe4db90fa948b96ae5e69feb7792d

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/29871/

Comments