remcos | 997371c951144335618b3c5f4608afebf7688a58b6a95cdc71f237f2a7cc56a2

General

Target

download.exe
Size

483KB
MD5

b0b179cb58814287051a3933455c382e
SHA1

23bb06299fe32cc15786f9b79c22e5d7af50802a
SHA256

997371c951144335618b3c5f4608afebf7688a58b6a95cdc71f237f2a7cc56a2
SHA512

6c0c6fbd544517b05e17cdd15e64698df5683b51a9fc79dfe51e18c62202d2d45626ba41e6c9b7b7ae507ce474c948f501971815afa6accc81b4268afafb11c9
SSDEEP

6144:RTz+c6KHYBhDc1RGJdv//NkUn+N5Bkf/0TELRvIZPjbsAOZZmAX4crgWT4:RTlrYw1RUh3NFn+N5WfIQIjbs/ZmgT4

Score

10^/10

remcos remotehost collection discovery rat spyware stealer

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

maxert.wemnbbsweoipmngbyutrdcunbgrtjeroendns.pro:6845

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
notpad0
keylog_path
%Temp%
mouse_option
false
mutex
Rmc-EPF38I
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

Detected Nirsoft tools 9 IoCs

Free utilities often used by attackers which can steal passwords, product keys, etc.

resource	yara_rule
behavioral2/memory/3248-8-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/524-16-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/524-22-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/3248-15-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/2444-14-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/2444-9-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/524-13-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/3248-23-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/2444-26-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/3248-8-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView
behavioral2/memory/3248-15-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView
behavioral2/memory/3248-23-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 3 IoCs

Password recovery tool for various web browsers

resource	yara_rule
behavioral2/memory/2444-14-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/2444-9-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/2444-26-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Reads user/profile data of web browsers 3 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

Credentials from Web Browsers
T1555.003

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2392887640-1187051047-2909758433-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	download.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 3940 set thread context of 2444	3940	download.exe	82
PID 3940 set thread context of 3248	3940	download.exe	83
PID 3940 set thread context of 524	3940	download.exe	84

System Location Discovery: System Language Discovery 1 TTPs 4 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	download.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	download.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	download.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	download.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2444	download.exe
2444	download.exe
524	download.exe
524	download.exe
2444	download.exe
2444	download.exe

Suspicious behavior: MapViewOfSection 3 IoCs

pid	Process
3940	download.exe
3940	download.exe
3940	download.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	524	download.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3940	download.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 3940 wrote to memory of 2444	3940	download.exe	82
PID 3940 wrote to memory of 2444	3940	download.exe	82
PID 3940 wrote to memory of 2444	3940	download.exe	82
PID 3940 wrote to memory of 3248	3940	download.exe	83
PID 3940 wrote to memory of 3248	3940	download.exe	83
PID 3940 wrote to memory of 3248	3940	download.exe	83
PID 3940 wrote to memory of 524	3940	download.exe	84
PID 3940 wrote to memory of 524	3940	download.exe	84
PID 3940 wrote to memory of 524	3940	download.exe	84

C:\Users\Admin\AppData\Local\Temp\download.exe
"C:\Users\Admin\AppData\Local\Temp\download.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3940
- C:\Users\Admin\AppData\Local\Temp\download.exe
  C:\Users\Admin\AppData\Local\Temp\download.exe /stext "C:\Users\Admin\AppData\Local\Temp\sfufdnsfsujmwoqypfx"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  PID:2444
- C:\Users\Admin\AppData\Local\Temp\download.exe
  C:\Users\Admin\AppData\Local\Temp\download.exe /stext "C:\Users\Admin\AppData\Local\Temp\uziydgczgcbryceczqkbft"
  2⤵
  - Accesses Microsoft Outlook accounts
  - System Location Discovery: System Language Discovery
  PID:3248
- C:\Users\Admin\AppData\Local\Temp\download.exe
  C:\Users\Admin\AppData\Local\Temp\download.exe /stext "C:\Users\Admin\AppData\Local\Temp\fbnqeyvauktwiibgibxcqgdoqy"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:524

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\notpad0\logs.dat

Filesize
144B

MD5
c80aabaa5a878d80146131d3b5eee625

SHA1
e0489f7c6e4956d0b85e2e8dc1c84c5d68355a7a

SHA256
dce1919528c3a31725e22f142c6fe239330c47d4ccfdefe6a5567c0f264c3f92

SHA512
0568febaac18c90afd686c29f88dadd4985873b18f95a49bfce88485091d77321ddce661e688a3c23df3c0d07e0c84be013691d4c329d07f5e0665a63cd07db6

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

Filesize
4KB

MD5
2538ec9e8425a905937573069b77d4c2

SHA1
ad0c2b7aff4382e23444d26adac96d9697b849f3

SHA256
29338949fae4c88a972837aae898529e4c7a2c4df35982eef2f8d7b602c17f4e

SHA512
a867a471b837b9c662528ee7a5904e8fe7b1eebb277b8a7fe4d4caf423fae914baf692bb5004c02ddb539b157d63326178467e28b03aa92a533cda19155d501c

Download Submit
memory/524-12-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/524-10-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/524-16-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/524-20-0x0000000000430000-0x00000000004F9000-memory.dmp

Filesize
804KB

Download
memory/524-22-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/524-13-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/2444-26-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2444-14-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2444-9-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2444-1-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/2444-6-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/3248-7-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/3248-23-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/3248-15-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/3248-8-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/3248-4-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/3940-29-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/3940-34-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/3940-33-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/3940-32-0x0000000010000000-0x0000000010019000-memory.dmp

Filesize
100KB

Download
memory/3940-37-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download

Analysis

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