MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 c39bdd8f7c69c3140ef920e2b1d5965310058c5fa425b871f4d7751d8291d55e. 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: 12


Intelligence 12 IOCs YARA 9 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: c39bdd8f7c69c3140ef920e2b1d5965310058c5fa425b871f4d7751d8291d55e
SHA3-384 hash: 6414c2d6f8512cf92c56f14e6775b07b466cbbcad52329283e68f7d5c9559ae3c7d72b3b986e96977d1d5a3dfdc9bc32
SHA1 hash: 97e94a141b7d479fd14373f724ce3232c2b0c429
MD5 hash: c6ed7e791f0c36826d3c55e196dd7bd4
humanhash: six-mountain-missouri-stairway
File name:ACTION2021.scr
Download: download sample
Signature RemcosRAT
Create hunting rule
File size:1'418'752 bytes
First seen:2021-01-06 17:59:55 UTC
Last seen:2021-01-06 19:47:39 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'747 x AgentTesla, 19'638 x Formbook, 12'244 x SnakeKeylogger)
ssdeep 6144:Yc8zqRBNKKrchaxEms/0NxMajaTHfSs6:YGchajwS
Threatray 1'321 similar samples on MalwareBazaar
TLSH 3C65B7006FD3214EF2F7E07612B19ADA9F75FA7A72805E0D865D2A550C03F862F93D4A
Reporter abuse_ch
Tags:nVpn Rackspace RAT RemcosRAT scr


Avatar
abuse_ch
Malspam distributing RemcosRAT:

HELO: smtp98.iad3a.emailsrvr.com
Sending IP: 173.203.187.98
From: AICPA© <info@aicpa.org>
Reply-To: info1@aicpa.org
Subject: Notice of AICPA Sanction
Attachment: License_Action_20215645.img (contains "ACTION2021.scr")

RemcosRAT C2:
masters4733.sytes.net:8686 (79.134.225.8)

Pointing to nVpn:

% Information related to '79.134.225.0 - 79.134.225.127'

% Abuse contact for '79.134.225.0 - 79.134.225.127' is 'abuse@privacyfirst.sh'

inetnum: 79.134.225.0 - 79.134.225.127
netname: PRIVACYFIRST-EU
country: EU
remarks: This prefix is assigned to The PRIVACYFIRST Project, which
remarks: operates infrastructure jointly used by various VPN service
remarks: providers. We have a very strong focus on privacy and freedom.
remarks: In case of abuse, we encourage all international law enforcement
remarks: agencies to get in touch with our abuse contact. Due to the fact
remarks: that we keep no logs of user activities and only share data when
remarks: it is legally required under our jurisdiction, it is very unlikely
remarks: for a demand of user information to be successful. Still, that
remarks: should not deter you from reaching out.
admin-c: TPP15-RIPE
tech-c: TPP15-RIPE
status: ASSIGNED PA
mnt-by: AF15-MNT
org: ORG-TPP6-RIPE
created: 2020-07-14T15:26:02Z
last-modified: 2020-07-14T15:31:06Z
source: RIPE

Intelligence

File Origin
# of uploads :
2
# of downloads :
280
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
ACTION2021.scr
Verdict:
Malicious activity
Analysis date:
2021-01-06 17:41:16 UTC
Tags:
rat remcos keylogger
Link:
https://app.any.run/tasks/c7b5831f-3eeb-443d-9f58-00f29b2f7048

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
Parallax
Create hunting rule
Link:
https://www.capesandbox.com/analysis/110771/
Detection(s):
SecuriteInfo.com.BehavesLike.Win32.Backdoor.tz.2640.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Sending a UDP request
Creating a file
Creating a file in the %AppData% subdirectories
Creating a file in the %temp% directory
Launching cmd.exe command interpreter
Creating a process from a recently created file
Creating a process with a hidden window
Launching a process
Deleting a recently created file
Running batch commands
Unauthorized injection to a recently created process
Enabling autorun with the standard Software\Microsoft\Windows\CurrentVersion\Run registry branch
Blocking the User Account Control
Result
Verdict:
UNKNOWN
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/575355
Signature
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
Detected Remcos RAT
Icon mismatch, binary includes an icon from a different legit application in order to fool users
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)
Tries to delay execution (extensive OutputDebugStringW loop)
Yara detected Remcos RAT
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 336733 Sample: ACTION2021.scr Startdate: 06/01/2021 Architecture: WINDOWS Score: 100 65 cdn.onenote.net 2->65 67 prda.aadg.msidentity.com 2->67 69 Malicious sample detected (through community Yara rule) 2->69 71 Icon mismatch, binary includes an icon from a different legit application in order to fool users 2->71 73 Detected Remcos RAT 2->73 75 2 other signatures 2->75 12 ACTION2021.exe 3 2->12         started        16 start.exe 2->16         started        signatures3 process4 file5 61 C:\Users\user\AppData\...\ACTION2021.exe.log, ASCII 12->61 dropped 81 Contains functionality to steal Chrome passwords or cookies 12->81 83 Contains functionality to capture and log keystrokes 12->83 85 Contains functionality to inject code into remote processes 12->85 89 2 other signatures 12->89 18 ACTION2021.exe 4 5 12->18         started        21 start.exe 2 12->21         started        87 Injects a PE file into a foreign processes 16->87 23 start.exe 16->23         started        25 start.exe 16->25         started        signatures6 process7 file8 57 C:\Users\user\AppData\Roaming\...\start.exe, PE32 18->57 dropped 59 C:\Users\user\...\start.exe:Zone.Identifier, ASCII 18->59 dropped 27 wscript.exe 1 18->27         started        29 cmd.exe 1 18->29         started        31 start.exe 18->31         started        process9 process10 33 cmd.exe 1 27->33         started        35 reg.exe 1 29->35         started        37 conhost.exe 29->37         started        process11 39 start.exe 3 33->39         started        42 conhost.exe 33->42         started        44 conhost.exe 35->44         started        46 reg.exe 35->46         started        signatures12 77 Machine Learning detection for dropped file 39->77 79 Tries to delay execution (extensive OutputDebugStringW loop) 39->79 48 start.exe 39->48         started        51 start.exe 39->51         started        53 start.exe 39->53         started        process13 dnsIp14 63 masters4733.sytes.net 79.134.225.8, 49713, 8686 FINK-TELECOM-SERVICESCH Switzerland 48->63 55 cmd.exe 48->55         started        process15
Detection:
remcos
Create hunting rule
Link:
https://mwdb.cert.pl/sample/c39bdd8f7c69c3140ef920e2b1d5965310058c5fa425b871f4d7751d8291d55e/
Threat name:
ByteCode-MSIL.Backdoor.Remcos
Create hunting rule
Status:
Malicious
First seen:
2021-01-06 18:00:07 UTC
AV detection:
16 of 28 (57.14%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=yon53d34nhbridxzedrldvmwkmialdc7uqs3q4pu252r3aur2vpa._file
Verdict:
malicious
Label(s):
remcos
Create hunting rule
Similar samples:
15170d0dbe467efc4e38156ed4e03702ae19af44c100d7df7a75c6dbdb7ac587
RemcosRAT
4791861118e0be776fd14153e2feca7d25f5a91a6c32a997385f5ae272e3d7c8
RemcosRAT
4a94b062dbb9df940520146d100df5b019795d0f508d7ba89d24eb18725e1608
RemcosRAT
5ab68910c53ccaea0aa6c9e51fa8ad92433cba369163f99f636973b32abda555
RemcosRAT
5b10f4a23880b51923a0df3e9e3c37f40eb0d3cc93de7b463da62f936a501385
RemcosRAT
a21b11bd7b89c961a73c2184f95b9eb6981e8aa5e06c0199070afe48d7bdf050
RemcosRAT
b4156e553eb5b0bad1d240dd170820106d6ca6bc0d1984a9d09030864349d964
RemcosRAT
f43a96ccf1d23d7dda1abbc2bea16ecbb2fb43b2f05e4015ff69c02e2c144ab2
RemcosRAT
f7e29cbf47c9804eb341836873ea6837be7a46639978f44d9ba2670d47e68d56
RemcosRAT
fd16b4767d7764fde593f6b7d6449ccb233c18270bf45d67edde500c5028dc94
RemcosRAT
+ 1'311 additional samples on MalwareBazaar
Result
Malware family:
remcos
Create hunting rule
Score:
  10/10
Tags:
family:remcos evasion persistence rat spyware trojan
Link:
https://tria.ge/reports/210106-8vzdnjlyfs/
Behaviour
Modifies registry key
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Modifies registry class
Suspicious use of SetThreadContext
Adds Run key to start application
Loads dropped DLL
Reads user/profile data of web browsers
Executes dropped EXE
Remcos
UAC bypass
Malware Config
C2 Extraction:
masters4733.sytes.net:8686
Unpacked files
SH256 hash:
c39bdd8f7c69c3140ef920e2b1d5965310058c5fa425b871f4d7751d8291d55e
MD5 hash:
c6ed7e791f0c36826d3c55e196dd7bd4
SHA1 hash:
97e94a141b7d479fd14373f724ce3232c2b0c429
Link:
https://www.unpac.me/results/4631be65-926a-4709-b4b7-849f75924837/
SH256 hash:
07efb1f3ae2868a0103a1db699fe10a7881e25b3619b5754f541654c36424f03
MD5 hash:
06506be2139bc5fda4447729a55db571
SHA1 hash:
ea3b0d640fb8edb9c35038b8b4b6839b6149b399
Link:
https://www.unpac.me/results/4631be65-926a-4709-b4b7-849f75924837/
SH256 hash:
d783620b10c5ef0e34bea9bd31b5ce35765b81f7e88d9a74b6292f1f35e44cfe
MD5 hash:
539bbab7d4de36003464e5cd46de4aac
SHA1 hash:
125204121f22f36878c4d25e90ff292708ae12b3
Detections:
win_remcos_g0
Create hunting rule
win_remcos_auto
Create hunting rule
Link:
https://www.unpac.me/results/4631be65-926a-4709-b4b7-849f75924837/
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/c39bdd8f7c69c3140ef920e2b1d5965310058c5fa425b871f4d7751d8291d55e

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 07d5866c6d802fb7a75af6dcae1a8cac789f71b0ba3635d75a834f705788b5f8

RemcosRAT

Executable exe c39bdd8f7c69c3140ef920e2b1d5965310058c5fa425b871f4d7751d8291d55e

(this sample)

  
Dropped by
MD5 497f75411e39754fc4deedd270ad4ab8
  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/110771/
  
Dropped by
SHA256 07d5866c6d802fb7a75af6dcae1a8cac789f71b0ba3635d75a834f705788b5f8

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