MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 a4fb793dd11e5ed81d42933185343398edfc35894313d64eca38e672f2d95419. 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: 10


Intelligence 10 IOCs YARA 9 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: a4fb793dd11e5ed81d42933185343398edfc35894313d64eca38e672f2d95419
SHA3-384 hash: 4cc373db727fa3e380df8859a8e811f0bb6201a6ac5aeeebea00cd3c5655d5e995f4d2e9ebaa6810a0d7bd33c0cd7c59
SHA1 hash: 368cbb3055e620a6ff3b3856eb350d5935afe0ec
MD5 hash: 2de1de147c59211120377a81f62dc087
humanhash: gee-uniform-ink-ack
File name:Customer_Receivables_Aging_20210112_2663535345242424242.exe
Download: download sample
Signature RemcosRAT
Create hunting rule
File size:923'744 bytes
First seen:2021-01-12 18:00:33 UTC
Last seen:2021-01-12 19:49:04 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash 64358d6f08cc1315b22d09caf06d11de (3 x ModiLoader, 1 x Formbook, 1 x Loki)
ssdeep 12288:lxo8KOEfGe3aw42Tv9aW3G2jj7oLjzxmhAQhjJRKwmvCRqlZVpiiiiiOvpGQ:laFuIb4oH0QRjJRgCclZ7iiiiiMsQ
Threatray 1'361 similar samples on MalwareBazaar
TLSH 96154A3672A07576F17106354C1BD270CE29AF33291B366A1AEAB8CF5A303C5E817D76
Reporter abuse_ch
Tags:exe RAT RemcosRAT


Avatar
abuse_ch
Malspam distributing RemcosRAT:

HELO: rdns0.proxnutcum.website
Sending IP: 192.95.42.212
From: Oda Biederlack <Odaa@ctsnam.com>
Subject: December statement Central Technical Supplies
Attachment: Customer_Receivables_Aging_20210112_.img (contains "Customer_Receivables_Aging_20210112_2663535345242424242.exe")

Intelligence

File Origin
# of uploads :
2
# of downloads :
132
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
Customer_Receivables_Aging_20210112_2663535345242424242.exe
Verdict:
Malicious activity
Analysis date:
2021-01-12 18:36:24 UTC
Tags:
trojan rat remcos
Link:
https://app.any.run/tasks/84fb0806-7ed5-467e-bc2d-f28a9e6beeb8

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/111571/
Detection(s):
PUA.Win.Adware.Slugin-6803969-0
Create hunting rule

PUA.Win.Adware.Slugin-6840354-0
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Sending a UDP request
DNS request
Sending a custom TCP request
Creating a file
Launching a process
Enabling autorun with the standard Software\Microsoft\Windows\CurrentVersion\Run registry branch
Unauthorized injection to a recently created process
Result
Verdict:
MALICIOUS
Details
Windows PE Executable
Found a Windows Portable Executable (PE) binary. Depending on context, the presence of a binary is suspicious or malicious.
Result
Threat name:
Remcos
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/579408
Signature
Allocates memory in foreign processes
Antivirus / Scanner detection for submitted sample
Antivirus detection for dropped file
Contains functionality to capture and log keystrokes
Contains functionality to inject code into remote processes
Contains functionality to steal Chrome passwords or cookies
Contains functionality to steal Firefox passwords or cookies
Creates a thread in another existing process (thread injection)
Detected Remcos RAT
Injects a PE file into a foreign processes
Machine Learning detection for dropped file
Machine Learning detection for sample
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Writes to foreign memory regions
Yara detected Remcos RAT
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 338759 Sample: Customer_Receivables_Aging_... Startdate: 12/01/2021 Architecture: WINDOWS Score: 100 40 Malicious sample detected (through community Yara rule) 2->40 42 Antivirus / Scanner detection for submitted sample 2->42 44 Multi AV Scanner detection for submitted file 2->44 46 7 other signatures 2->46 6 Zhltnlution.exe 17 2->6         started        10 Customer_Receivables_Aging_20210112_2663535345242424242.exe 1 21 2->10         started        13 Zhltnlution.exe 16 2->13         started        process3 dnsIp4 26 dm-files.fe.1drv.com 6->26 28 7drdag.am.files.1drv.com 6->28 48 Antivirus detection for dropped file 6->48 50 Multi AV Scanner detection for dropped file 6->50 52 Machine Learning detection for dropped file 6->52 15 ieinstal.exe 6->15         started        30 1drv.ws 168.235.93.122, 443, 49728, 49733 RAMNODEUS United States 10->30 32 dm-files.fe.1drv.com 10->32 34 7drdag.am.files.1drv.com 10->34 22 C:\Users\user\Contacts\Zhltnlution.exe, PE32 10->22 dropped 54 Writes to foreign memory regions 10->54 56 Allocates memory in foreign processes 10->56 58 Creates a thread in another existing process (thread injection) 10->58 17 ieinstal.exe 2 10->17         started        36 dm-files.fe.1drv.com 13->36 38 7drdag.am.files.1drv.com 13->38 60 Injects a PE file into a foreign processes 13->60 20 ieinstal.exe 13->20         started        file5 signatures6 process7 dnsIp8 24 216.38.7.225, 49739, 7082 ASN-GIGENETUS United States 17->24
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/a4fb793dd11e5ed81d42933185343398edfc35894313d64eca38e672f2d95419/
Threat name:
Win32.Trojan.AgentTesla
Create hunting rule
Status:
Malicious
First seen:
2021-01-12 11:05:40 UTC
AV detection:
14 of 29 (48.28%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=ut5xspordzpnqhkcsmyyknbttdw7ynmjimj5mtwkhdthf4wzkqmq._file
Verdict:
malicious
Label(s):
remcos
Create hunting rule
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RemcosRAT
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a7bba5cba33b4320a78cd057e3cdd5169a86e90f6550e997772f4447549fd729
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RemcosRAT
+ 1'351 additional samples on MalwareBazaar
Result
Malware family:
remcos
Create hunting rule
Score:
  10/10
Tags:
family:modiloader family:remcos persistence rat
Link:
https://tria.ge/reports/210112-gnklkfjmls/
Behaviour
Modifies system certificate store
Script User-Agent
Suspicious use of WriteProcessMemory
Adds Run key to start application
Remcos
Unpacked files
SH256 hash:
a4fb793dd11e5ed81d42933185343398edfc35894313d64eca38e672f2d95419
MD5 hash:
2de1de147c59211120377a81f62dc087
SHA1 hash:
368cbb3055e620a6ff3b3856eb350d5935afe0ec
Link:
https://www.unpac.me/results/5a260b52-2b90-458c-b90a-24e78d6761ca/
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
DriveBy Activity
Score:
0.90
Link:
https://yomi.yoroi.company/submissions/a4fb793dd11e5ed81d42933185343398edfc35894313d64eca38e672f2d95419

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:ach_RemcosRAT
Create hunting rule
Author:abuse.ch
Rule name:Chrome_stealer_bin_mem
Create hunting rule
Author:James_inthe_box
Description:Chrome in files like avemaria
Rule name:INDICATOR_SUSPICIOUS_EXE_UACBypass_EventViewer
Create hunting rule
Author:ditekSHen
Description:detects Windows exceutables potentially bypassing UAC using eventvwr.exe
Rule name:Keylog_bin_mem
Create hunting rule
Author:James_inthe_box
Description:Contains Keylog
Rule name:Parallax
Create hunting rule
Author:@bartblaze
Description:Identifies Parallax RAT.
Rule name:Remcos
Create hunting rule
Author:JPCERT/CC Incident Response Group
Description:detect Remcos in memory
Rule name:remcos_rat
Create hunting rule
Author:jeFF0Falltrades
Rule name:REMCOS_RAT_variants
Create hunting rule
Rule name:win_remcos_auto
Create hunting rule
Author:Felix Bilstein - yara-signator at cocacoding dot com
Description:autogenerated rule brought to you by yara-signator

File information

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

Malspam

RemcosRAT

img c8a150985b28b5eac3722b9bc743f72325463b969a5a44c45d015fdc83403ec1

RemcosRAT

Executable exe a4fb793dd11e5ed81d42933185343398edfc35894313d64eca38e672f2d95419

(this sample)

  
Dropped by
MD5 bc70c145696e8b21b7cb2518cdf8f645
  
Delivery method
Distributed via e-mail attachment
  
Dropped by
SHA256 c8a150985b28b5eac3722b9bc743f72325463b969a5a44c45d015fdc83403ec1
Cape
Cape
https://www.capesandbox.com/analysis/111571/

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