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MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 bb8fa4039b084777dc5aaef928337d99f851fe7fdfc7e81d7de21bedea43cb81. 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


RemcosRAT


Vendor detections: 8


Intelligence 8 IOCs YARA 1 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: bb8fa4039b084777dc5aaef928337d99f851fe7fdfc7e81d7de21bedea43cb81
SHA3-384 hash: 45eb43fe2769a9b246d8c18b243d9783a3ab1ede7c64d8d0b2b7172d9eed859e98b114c72dfd59fc0d5baacd2c111a35
SHA1 hash: 4a3a189b5eea9b3e54f3d740664eaf5652955e27
MD5 hash: 0ae0c7f1e40a696354bbfc2b23f74e77
humanhash: december-cup-sierra-mike
File name:justificante de la transferencia.js
Download: download sample
Signature RemcosRAT
Create hunting rule
File size:47'236 bytes
First seen:2026-10-28 13:08:30 UTC
Last seen:Never
File type:Java Script (JS) js
MIME type:text/plain
ssdeep 768:K4w5Xog6hiXFl8ArP9FDyeRYb10J2qBSpqLpo0R/9KUZeaqg7Y/:K4w5XmkWArP9BC6BGqlzRpZe6q
TLSH T12F235CA0CD1755BB0B657B6C6CB85626C5B88314C463C4A0F7EEC71927C0E98E7B84AF
Magika javascript
Reporter abuse_ch
Tags:ESP geo js RemcosRAT

Intelligence

File Origin
# of uploads :
1
# of downloads :
186
Origin country :
SE SE
Vendor Threat Intelligence
No detections
Verdict:
Clean
Score:
89.3%
Link:
https://cyber-fortress.com/docs/result/index.php?id=6ae1f40149621540087c296d
Tags:
n/a
Verdict:
Suspicious
Labled as:
JS/Agent.FHN
Link:
https://www.hybrid-analysis.com/sample/bb8fa4039b084777dc5aaef928337d99f851fe7fdfc7e81d7de21bedea43cb81
Verdict:
Malicious
File Type:
js
First seen:
2026-10-28T07:39:00Z UTC
Last seen:
2026-10-28T10:03:00Z UTC
Hits:
~100
Link:
https://opentip.kaspersky.com/bb8fa4039b084777dc5aaef928337d99f851fe7fdfc7e81d7de21bedea43cb81/results?tab=lookup
Result
Threat name:
GuLoader
Create hunting rule
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1994001
Signature
Creates processes via WMI
Found suspicious powershell code related to unpacking or dynamic code loading
Joe Sandbox ML detected suspicious sample
JScript performs obfuscated calls to suspicious functions
Malicious sample detected (through community Yara rule)
Obfuscated command line found
Powershell connects to network
Sigma detected: WScript or CScript Dropper
Suspicious execution chain found
Switches to a custom stack to bypass stack traces
Windows Scripting host queries suspicious COM object (likely to drop second stage)
Writes to foreign memory regions
Wscript starts Powershell (via cmd or directly)
Yara detected GuLoader
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1994001 Sample: justificante de la transfer... Startdate: 28/10/2026 Architecture: WINDOWS Score: 100 27 drive.usercontent.google.com 2->27 29 drive.google.com 2->29 43 Malicious sample detected (through community Yara rule) 2->43 45 Yara detected GuLoader 2->45 47 Sigma detected: WScript or CScript Dropper 2->47 49 Joe Sandbox ML detected suspicious sample 2->49 9 wscript.exe 1 2->9         started        signatures3 process4 signatures5 51 JScript performs obfuscated calls to suspicious functions 9->51 53 Wscript starts Powershell (via cmd or directly) 9->53 55 Obfuscated command line found 9->55 57 3 other signatures 9->57 12 cmd.exe 1 9->12         started        process6 signatures7 59 Wscript starts Powershell (via cmd or directly) 12->59 15 powershell.exe 1 267 12->15         started        19 conhost.exe 12->19         started        21 cmd.exe 1 12->21         started        process8 dnsIp9 31 drive.usercontent.google.com 142.251.111.132, 443, 49713 GOOGLE-GoogleLLCUS United States 15->31 33 drive.google.com 142.251.167.102, 443, 49712 GOOGLE-GoogleLLCUS Canada 15->33 35 Writes to foreign memory regions 15->35 37 Found suspicious powershell code related to unpacking or dynamic code loading 15->37 39 Switches to a custom stack to bypass stack traces 15->39 41 Powershell connects to network 15->41 23 backgroundTaskHost.exe 15->23         started        25 backgroundTaskHost.exe 15->25         started        signatures10 process11
Score:
99%
Verdict:
Malware
File Type:
SCRIPT
Link:
https://malprob.io/report/bb8fa4039b084777dc5aaef928337d99f851fe7fdfc7e81d7de21bedea43cb81
Verdict:
inconclusive
YARA:
2 match(es)
Tags:
Javascript T1059.007
Link:
https://app.malva.re/file/0ae0c7f1e40a696354bbfc2b23f74e77
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/bb8fa4039b084777dc5aaef928337d99f851fe7fdfc7e81d7de21bedea43cb81/
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=xoh2ia43bbdxpxc2v34sqm35th4fd7t737d6qhl54in632sdzoaq._file
Result
Malware family:
remcos
Create hunting rule
Score:
  10/10
Tags:
family:guloader family:remcos botnet:remotehost defense_evasion discovery downloader execution persistence privilege_escalation rat
Link:
https://tria.ge/reports/261028-qdwwfscv51/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Command and Scripting Interpreter: JavaScript
Executes a command shell one-liner
Reads the TCP/IP host and domain name from the registry
System Location Discovery: System Language Discovery
Drops file in Windows directory
Drops file in System32 directory
Suspicious use of NtCreateThreadExHideFromDebugger
Suspicious use of NtSetInformationThreadHideFromDebugger
Adds Run key to start application
Contacts third-party web service commonly abused for C2
Badlisted process makes network request
Family: Guloader,Cloudeye
Family: Remcos
Process spawned unexpected child process
Malware Config
C2 Extraction:
155.103.71.194:14640
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/bb8fa4039b084777dc5aaef928337d99f851fe7fdfc7e81d7de21bedea43cb81

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:Sus_CMD_Powershell_Usage
Create hunting rule
Author:XiAnzheng
Description:May Contain(Obfuscated or no) Powershell or CMD Command that can be abused by threat actor(can create FP)

File information

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

Comments