remcos | b8c66af97b06b4660cd8000811f9333bda7bb032f57767c0417819820b3ebdf8

Analysis

max time kernel
149s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20231127-en
resource tags

arch:x64arch:x86image:win10v2004-20231127-enlocale:en-usos:windows10-2004-x64system
submitted
12-12-2023 14:39

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

MEMQ098789009000.exe
Size

433KB
MD5

a8866d1129bde5e76d54062999935308
SHA1

f96e8c5ca7c3369aea4e9286cc60c96455c0ef81
SHA256

5ed2be2c358988a27a0973273b80c89f3e0cb808b654a2a09b91bcf5a38c46c7
SHA512

bae3ab100553f6a57fa82e0b033a43e576992001fff62f6eea33d7441231bd07541cbb8f981214663a564fa73cd63c39555c4de28df0ce3c7f9e951c3ff4a3ef
SSDEEP

6144:P8LxBsMBAsL9XYtikPb8G1XE2cr9oLN/JM+QlFM2y5FI6uRh41vhgyXKZK4gmn:BIzL9cjp0gNfNI63vhgyTmn

Score

10^/10

remcos remotehost collection persistence rat spyware stealer upx

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

107.175.229.139:8087

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
remcos.exe
copy_folder
Remcos
delete_file
false
hide_file
false
hide_keylog_file
false
install_flag
false
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-IZFV1M
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
take_screenshot_option
false
take_screenshot_time
5

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

Processes:

resource	yara_rule
behavioral2/memory/4784-42-0x0000000000400000-0x0000000000457000-memory.dmp	MailPassView
behavioral2/memory/4784-49-0x0000000000400000-0x0000000000457000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 2 IoCs

Password recovery tool for various web browsers

Processes:

resource	yara_rule
behavioral2/memory/4976-38-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/4976-52-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Nirsoft 6 IoCs

Processes:

resource	yara_rule
behavioral2/memory/4976-38-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/4784-42-0x0000000000400000-0x0000000000457000-memory.dmp	Nirsoft
behavioral2/memory/5016-48-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/4784-49-0x0000000000400000-0x0000000000457000-memory.dmp	Nirsoft
behavioral2/memory/5016-50-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/4976-52-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft

Executes dropped EXE 7 IoCs

Processes:

rriyu.exerriyu.exerriyu.exerriyu.exerriyu.exerriyu.exerriyu.exe

pid process

4796 rriyu.exe
4748 rriyu.exe
4872 rriyu.exe
1736 rriyu.exe
4976 rriyu.exe
4784 rriyu.exe
5016 rriyu.exe
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

pid	process
4796	rriyu.exe
4748	rriyu.exe
4872	rriyu.exe
1736	rriyu.exe
4976	rriyu.exe
4784	rriyu.exe
5016	rriyu.exe

UPX packed file 25 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

Processes:

resource	yara_rule
behavioral2/memory/1736-10-0x0000000000400000-0x000000000048B000-memory.dmp	upx
behavioral2/memory/1736-12-0x0000000000400000-0x000000000048B000-memory.dmp	upx
behavioral2/memory/1736-13-0x0000000000400000-0x000000000048B000-memory.dmp	upx
behavioral2/memory/1736-14-0x0000000000400000-0x000000000048B000-memory.dmp	upx
behavioral2/memory/1736-15-0x0000000000400000-0x000000000048B000-memory.dmp	upx
behavioral2/memory/1736-16-0x0000000000400000-0x000000000048B000-memory.dmp	upx
behavioral2/memory/1736-18-0x0000000000400000-0x000000000048B000-memory.dmp	upx
behavioral2/memory/1736-19-0x0000000000400000-0x000000000048B000-memory.dmp	upx
behavioral2/memory/1736-20-0x0000000000400000-0x000000000048B000-memory.dmp	upx
behavioral2/memory/1736-21-0x0000000000400000-0x000000000048B000-memory.dmp	upx
behavioral2/memory/1736-22-0x0000000000400000-0x000000000048B000-memory.dmp	upx
behavioral2/memory/1736-23-0x0000000000400000-0x000000000048B000-memory.dmp	upx
behavioral2/memory/1736-24-0x0000000000400000-0x000000000048B000-memory.dmp	upx
behavioral2/memory/1736-26-0x0000000000400000-0x000000000048B000-memory.dmp	upx
behavioral2/memory/1736-60-0x0000000000400000-0x000000000048B000-memory.dmp	upx
behavioral2/memory/1736-62-0x0000000000400000-0x000000000048B000-memory.dmp	upx
behavioral2/memory/1736-63-0x0000000000400000-0x000000000048B000-memory.dmp	upx
behavioral2/memory/1736-65-0x0000000000400000-0x000000000048B000-memory.dmp	upx
behavioral2/memory/1736-72-0x0000000000400000-0x000000000048B000-memory.dmp	upx
behavioral2/memory/1736-80-0x0000000000400000-0x000000000048B000-memory.dmp	upx
behavioral2/memory/1736-81-0x0000000000400000-0x000000000048B000-memory.dmp	upx
behavioral2/memory/1736-88-0x0000000000400000-0x000000000048B000-memory.dmp	upx
behavioral2/memory/1736-89-0x0000000000400000-0x000000000048B000-memory.dmp	upx
behavioral2/memory/1736-96-0x0000000000400000-0x000000000048B000-memory.dmp	upx
behavioral2/memory/1736-97-0x0000000000400000-0x000000000048B000-memory.dmp	upx

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

Processes:

rriyu.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-3455265224-196869244-2056873367-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	rriyu.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

rriyu.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3455265224-196869244-2056873367-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\wgcktpyienjsc = "C:\\Users\\Admin\\AppData\\Roaming\\ejsoxt\\dmirb.exe \"C:\\Users\\Admin\\AppData\\Local\\Temp\\rriyu.exe\" "	rriyu.exe

Suspicious use of SetThreadContext 4 IoCs

Processes:

rriyu.exerriyu.exe

description	pid	process	target process
PID 4796 set thread context of 1736	4796	rriyu.exe	rriyu.exe
PID 1736 set thread context of 4976	1736	rriyu.exe	rriyu.exe
PID 1736 set thread context of 4784	1736	rriyu.exe	rriyu.exe
PID 1736 set thread context of 5016	1736	rriyu.exe	rriyu.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Suspicious behavior: EnumeratesProcesses 6 IoCs

Processes:

rriyu.exerriyu.exe

pid process

4976 rriyu.exe
4976 rriyu.exe
5016 rriyu.exe
5016 rriyu.exe
4976 rriyu.exe
4976 rriyu.exe
Suspicious behavior: MapViewOfSection 6 IoCs

Processes:

rriyu.exerriyu.exe

pid process

4796 rriyu.exe
4796 rriyu.exe
4796 rriyu.exe
1736 rriyu.exe
1736 rriyu.exe
1736 rriyu.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

rriyu.exe

description pid process

Token: SeDebugPrivilege 5016 rriyu.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

rriyu.exe

pid process

1736 rriyu.exe

pid	process
4976	rriyu.exe
4976	rriyu.exe
5016	rriyu.exe
5016	rriyu.exe
4976	rriyu.exe
4976	rriyu.exe

pid	process
4796	rriyu.exe
4796	rriyu.exe
4796	rriyu.exe
1736	rriyu.exe
1736	rriyu.exe
1736	rriyu.exe

description	pid	process
Token: SeDebugPrivilege	5016	rriyu.exe

pid	process
1736	rriyu.exe

Suspicious use of WriteProcessMemory 25 IoCs

Processes:

MEMQ098789009000.exerriyu.exerriyu.exe

description	pid	process	target process
PID 4056 wrote to memory of 4796	4056	MEMQ098789009000.exe	rriyu.exe
PID 4056 wrote to memory of 4796	4056	MEMQ098789009000.exe	rriyu.exe
PID 4056 wrote to memory of 4796	4056	MEMQ098789009000.exe	rriyu.exe
PID 4796 wrote to memory of 4748	4796	rriyu.exe	rriyu.exe
PID 4796 wrote to memory of 4748	4796	rriyu.exe	rriyu.exe
PID 4796 wrote to memory of 4748	4796	rriyu.exe	rriyu.exe
PID 4796 wrote to memory of 4872	4796	rriyu.exe	rriyu.exe
PID 4796 wrote to memory of 4872	4796	rriyu.exe	rriyu.exe
PID 4796 wrote to memory of 4872	4796	rriyu.exe	rriyu.exe
PID 4796 wrote to memory of 1736	4796	rriyu.exe	rriyu.exe
PID 4796 wrote to memory of 1736	4796	rriyu.exe	rriyu.exe
PID 4796 wrote to memory of 1736	4796	rriyu.exe	rriyu.exe
PID 4796 wrote to memory of 1736	4796	rriyu.exe	rriyu.exe
PID 1736 wrote to memory of 4976	1736	rriyu.exe	rriyu.exe
PID 1736 wrote to memory of 4976	1736	rriyu.exe	rriyu.exe
PID 1736 wrote to memory of 4976	1736	rriyu.exe	rriyu.exe
PID 1736 wrote to memory of 4976	1736	rriyu.exe	rriyu.exe
PID 1736 wrote to memory of 4784	1736	rriyu.exe	rriyu.exe
PID 1736 wrote to memory of 4784	1736	rriyu.exe	rriyu.exe
PID 1736 wrote to memory of 4784	1736	rriyu.exe	rriyu.exe
PID 1736 wrote to memory of 4784	1736	rriyu.exe	rriyu.exe
PID 1736 wrote to memory of 5016	1736	rriyu.exe	rriyu.exe
PID 1736 wrote to memory of 5016	1736	rriyu.exe	rriyu.exe
PID 1736 wrote to memory of 5016	1736	rriyu.exe	rriyu.exe
PID 1736 wrote to memory of 5016	1736	rriyu.exe	rriyu.exe

C:\Users\Admin\AppData\Local\Temp\MEMQ098789009000.exe
"C:\Users\Admin\AppData\Local\Temp\MEMQ098789009000.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4056

C:\Users\Admin\AppData\Local\Temp\rriyu.exe
"C:\Users\Admin\AppData\Local\Temp\rriyu.exe"
2⤵
- Executes dropped EXE
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:4796

C:\Users\Admin\AppData\Local\Temp\rriyu.exe
"C:\Users\Admin\AppData\Local\Temp\rriyu.exe"
3⤵
- Executes dropped EXE
PID:4748

C:\Users\Admin\AppData\Local\Temp\rriyu.exe
"C:\Users\Admin\AppData\Local\Temp\rriyu.exe"
3⤵
- Executes dropped EXE
PID:4872

C:\Users\Admin\AppData\Local\Temp\rriyu.exe
"C:\Users\Admin\AppData\Local\Temp\rriyu.exe"
3⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1736

C:\Users\Admin\AppData\Local\Temp\rriyu.exe
C:\Users\Admin\AppData\Local\Temp\rriyu.exe /stext "C:\Users\Admin\AppData\Local\Temp\hanszjcwwxqzwxnqiyeiqft"
4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:4976

C:\Users\Admin\AppData\Local\Temp\rriyu.exe
C:\Users\Admin\AppData\Local\Temp\rriyu.exe /stext "C:\Users\Admin\AppData\Local\Temp\jcslabnqkfimgdjurjqkbkoqfz"
4⤵
- Executes dropped EXE
- Accesses Microsoft Outlook accounts
PID:4784

C:\Users\Admin\AppData\Local\Temp\rriyu.exe
C:\Users\Admin\AppData\Local\Temp\rriyu.exe /stext "C:\Users\Admin\AppData\Local\Temp\uwyvbuysynarjsxgauddexihggbgj"
4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:5016

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\ProgramData\remcos\logs.dat

Filesize
144B

MD5
ae5d2ddc5131d874c754c56d9de9771c

SHA1
b5b27d94bc8c4b3f03ff757328ad3aaa5a5efe65

SHA256
41108607b0ac0f884ffac20a2d22d4ba23ed46141e4f543fffcce66e34916429

SHA512
a2e23b924163c3f1e502435dd140d8c9d20ce759d0dc7c01c1df5f12f0c70cda8bd28e9e5f59aa7482516369f686b0d4b6405f5461e5d4ce9da7f3246c259fc0

Download Submit
C:\Users\Admin\AppData\Local\Temp\hanszjcwwxqzwxnqiyeiqft

Filesize
4KB

MD5
b645998a8fdd6743c0a095bc36ef4b74

SHA1
1181e110c9cfb632824da8794afcc3ef8b8de1c7

SHA256
7f375fd0c1bf3b4a39e12d3290a97a8dffd1b1d73bbaf3a276fc5d2c2757cdfe

SHA512
0e21cd5bd73ab7bd0fbb34fc0b22a7c19e753003b347602466898b7983b38db49037decca1e805b1a5913dacf1f3f72b6b369987c782f15d797848c64f6e98d7

Download Submit
C:\Users\Admin\AppData\Local\Temp\rriyu.exe

Filesize
298KB

MD5
9ed7804f770de113fae310cdaf2be689

SHA1
f74338e68e4c0f7febf8d309ea9dc7bd6a07e03d

SHA256
78c6bf53430e1e759b0fbaa4ec19f896c8346c8685fc70aa42c41bd54d0e1f80

SHA512
02fbaa3cbbd16ca2c276738ecbc9cb0bbe77673e284debd7d5f5ab756e7dcf6155ae7df2f7a21c4dc91a31f8d1b13efa475c92b86ac49d3fc965565df99973d0

Download Submit
C:\Users\Admin\AppData\Local\Temp\rriyu.exe

Filesize
256KB

MD5
e98a07d23b27e68944873bcc2c830c23

SHA1
1896ed30d667f73c4e0bc4e8cd21654ce5086964

SHA256
3fa9312a993d473c8eecbfce22f64a32e1d96dce446a73cc1e5d97aea0ccc7de

SHA512
c0244b2df122b07d87a5b12c92f68c422aac3283b14140a2f8cd02f605265b22bb9a2561d95f3a9ca4c73e931a74874a2e30fce0dccd71bcfcb840c171ce477c

Download Submit
C:\Users\Admin\AppData\Local\Temp\yrhrmxpett.dhv

Filesize
252KB

MD5
67caf834c6a2ed78267251636f70dd2c

SHA1
f95b6fda0c4677abd94b64fac823bebb9d138080

SHA256
0d29db7d340aad6e7a08bdf00f001d522bdc8af5ff740151850bb92af6db76c8

SHA512
b7a628c5fdbbe49dd6aadd0dffcc64539637826bffece61e3aaccf776fce276e75f2b9d5de8e22efb0f7399c8083da7acca1a0e6c9b62a5864621183d0087ee8

Download Submit
memory/1736-62-0x0000000000400000-0x000000000048B000-memory.dmp

Filesize
556KB

Download
memory/1736-15-0x0000000000400000-0x000000000048B000-memory.dmp

Filesize
556KB

Download
memory/1736-14-0x0000000000400000-0x000000000048B000-memory.dmp

Filesize
556KB

Download
memory/1736-97-0x0000000000400000-0x000000000048B000-memory.dmp

Filesize
556KB

Download
memory/1736-16-0x0000000000400000-0x000000000048B000-memory.dmp

Filesize
556KB

Download
memory/1736-18-0x0000000000400000-0x000000000048B000-memory.dmp

Filesize
556KB

Download
memory/1736-19-0x0000000000400000-0x000000000048B000-memory.dmp

Filesize
556KB

Download
memory/1736-20-0x0000000000400000-0x000000000048B000-memory.dmp

Filesize
556KB

Download
memory/1736-21-0x0000000000400000-0x000000000048B000-memory.dmp

Filesize
556KB

Download
memory/1736-22-0x0000000000400000-0x000000000048B000-memory.dmp

Filesize
556KB

Download
memory/1736-23-0x0000000000400000-0x000000000048B000-memory.dmp

Filesize
556KB

Download
memory/1736-24-0x0000000000400000-0x000000000048B000-memory.dmp

Filesize
556KB

Download
memory/1736-26-0x0000000000400000-0x000000000048B000-memory.dmp

Filesize
556KB

Download
memory/1736-89-0x0000000000400000-0x000000000048B000-memory.dmp

Filesize
556KB

Download
memory/1736-88-0x0000000000400000-0x000000000048B000-memory.dmp

Filesize
556KB

Download
memory/1736-81-0x0000000000400000-0x000000000048B000-memory.dmp

Filesize
556KB

Download
memory/1736-80-0x0000000000400000-0x000000000048B000-memory.dmp

Filesize
556KB

Download
memory/1736-72-0x0000000000400000-0x000000000048B000-memory.dmp

Filesize
556KB

Download
memory/1736-69-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/1736-65-0x0000000000400000-0x000000000048B000-memory.dmp

Filesize
556KB

Download
memory/1736-96-0x0000000000400000-0x000000000048B000-memory.dmp

Filesize
556KB

Download
memory/1736-13-0x0000000000400000-0x000000000048B000-memory.dmp

Filesize
556KB

Download
memory/1736-63-0x0000000000400000-0x000000000048B000-memory.dmp

Filesize
556KB

Download
memory/1736-10-0x0000000000400000-0x000000000048B000-memory.dmp

Filesize
556KB

Download
memory/1736-60-0x0000000000400000-0x000000000048B000-memory.dmp

Filesize
556KB

Download
memory/1736-12-0x0000000000400000-0x000000000048B000-memory.dmp

Filesize
556KB

Download
memory/1736-54-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/1736-58-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/1736-57-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/1736-59-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/4784-30-0x0000000000400000-0x0000000000457000-memory.dmp

Filesize
348KB

Download
memory/4784-42-0x0000000000400000-0x0000000000457000-memory.dmp

Filesize
348KB

Download
memory/4784-49-0x0000000000400000-0x0000000000457000-memory.dmp

Filesize
348KB

Download
memory/4784-37-0x0000000000400000-0x0000000000457000-memory.dmp

Filesize
348KB

Download
memory/4796-5-0x0000000000D10000-0x0000000000D12000-memory.dmp

Filesize
8KB

Download
memory/4976-38-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/4976-52-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/4976-33-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/4976-28-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/5016-43-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/5016-50-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/5016-35-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/5016-48-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download