remcos | 3866b27ef82bad0f3a6d0e04a9480876f930d118d89485d72622651d31531308

General

Target

RFQ_f319c744-00b6-42df-aa0b-19a7524ce222.rtf
Size

636KB
MD5

4ea28268f6fc90f0e5cd4364b237b8e2
SHA1

ad65713260687c65091ca17ca6eee44c8fbf0126
SHA256

3866b27ef82bad0f3a6d0e04a9480876f930d118d89485d72622651d31531308
SHA512

a8e7bc9181db5c96e7d35dfbe31e23d250f2252023ac9741a15b0cd70a3549a0a82ba1fff0f5539ce8f53f4f6230dcecd3002668b8944a5ca3b67ec1c12c1c77
SSDEEP

6144:hwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAYwAa:kT

Score

10^/10

remcos remotehost discovery execution rat

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

www.kposlifestyle.design:2404

Attributes

audio_folder
MicRecords
audio_path
ApplicationPath
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
edefdefffff
mouse_option
false
mutex
Rmc-OH1QS4
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
Remcos family
remcos

Blocklisted process makes network request 2 IoCs

flow	pid	Process
5	2136	EQNEDT32.EXE
7	2136	EQNEDT32.EXE

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
1820	powershell.exe

Downloads MZ/PE file 1 IoCs

flow	pid	Process
5	2136	EQNEDT32.EXE

Executes dropped EXE 2 IoCs

pid	Process
2876	chromepluggm.exe
2872	chromepluggm.exe

Loads dropped DLL 1 IoCs

pid	Process
2136	EQNEDT32.EXE

Drops file in System32 directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\%ProgramData%\Microsoft\Windows\Start Menu\Programs\Accessories\Windows PowerShell\Windows PowerShell.lnk	powershell.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2876 set thread context of 2872	2876	chromepluggm.exe	38

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\Debug\WIA\wiatrace.log	WINWORD.EXE

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 5 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	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	chromepluggm.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	EQNEDT32.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	chromepluggm.exe

Office loads VBA resources, possible macro or embedded object present

Launches Equation Editor 1 TTPs 1 IoCs

Equation Editor is an old Office component often targeted by exploits such as CVE-2017-11882.

exploit

Exploitation for Client Execution

T1203

pid	Process
2136	EQNEDT32.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
2908	WINWORD.EXE

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1820	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1820	powershell.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
2908	WINWORD.EXE
2908	WINWORD.EXE
2872	chromepluggm.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 2136 wrote to memory of 2876	2136	EQNEDT32.EXE	33
PID 2136 wrote to memory of 2876	2136	EQNEDT32.EXE	33
PID 2136 wrote to memory of 2876	2136	EQNEDT32.EXE	33
PID 2136 wrote to memory of 2876	2136	EQNEDT32.EXE	33
PID 2908 wrote to memory of 668	2908	WINWORD.EXE	35
PID 2908 wrote to memory of 668	2908	WINWORD.EXE	35
PID 2908 wrote to memory of 668	2908	WINWORD.EXE	35
PID 2908 wrote to memory of 668	2908	WINWORD.EXE	35
PID 2876 wrote to memory of 1820	2876	chromepluggm.exe	36
PID 2876 wrote to memory of 1820	2876	chromepluggm.exe	36
PID 2876 wrote to memory of 1820	2876	chromepluggm.exe	36
PID 2876 wrote to memory of 1820	2876	chromepluggm.exe	36
PID 2876 wrote to memory of 2872	2876	chromepluggm.exe	38
PID 2876 wrote to memory of 2872	2876	chromepluggm.exe	38
PID 2876 wrote to memory of 2872	2876	chromepluggm.exe	38
PID 2876 wrote to memory of 2872	2876	chromepluggm.exe	38
PID 2876 wrote to memory of 2872	2876	chromepluggm.exe	38
PID 2876 wrote to memory of 2872	2876	chromepluggm.exe	38
PID 2876 wrote to memory of 2872	2876	chromepluggm.exe	38
PID 2876 wrote to memory of 2872	2876	chromepluggm.exe	38
PID 2876 wrote to memory of 2872	2876	chromepluggm.exe	38
PID 2876 wrote to memory of 2872	2876	chromepluggm.exe	38
PID 2876 wrote to memory of 2872	2876	chromepluggm.exe	38

C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE
"C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE" /n "C:\Users\Admin\AppData\Local\Temp\RFQ_f319c744-00b6-42df-aa0b-19a7524ce222.rtf"
1⤵
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2908
- C:\Windows\splwow64.exe
  C:\Windows\splwow64.exe 12288
  2⤵
  PID:668

C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE
"C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE" -Embedding
1⤵
- Blocklisted process makes network request
- Downloads MZ/PE file
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Launches Equation Editor
- Suspicious use of WriteProcessMemory
PID:2136
- C:\Users\Admin\AppData\Roaming\chromepluggm.exe
  "C:\Users\Admin\AppData\Roaming\chromepluggm.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2876
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\chromepluggm.exe"
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Drops file in System32 directory
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1820
- - C:\Users\Admin\AppData\Roaming\chromepluggm.exe
    "C:\Users\Admin\AppData\Roaming\chromepluggm.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    PID:2872

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Exploitation for Client Execution

1

T1203

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

\Users\Admin\AppData\Roaming\chromepluggm.exe

Filesize
1.0MB

MD5
4144b5ab8b096fc4115760eee6011598

SHA1
bfd7ec37807b6ae655242559114bad340f726e81

SHA256
b5bc975891963c29a16fe8ac7dd612f15afe937fd14ba95707a6ab30224bfc7a

SHA512
48d5b1deac0bda809662088a22b13859f477357fee9d1b62f4183d1f830c63d934bc5bbcbf998a15d53f6a11ea5ce69d0a693b777d2a173a76295c8c2a6d718d

Download Submit
memory/2872-40-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/2872-42-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/2872-47-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/2872-34-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/2872-36-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/2872-38-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/2872-48-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/2872-54-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/2872-45-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/2872-44-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2872-57-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/2872-55-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/2872-33-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/2872-51-0x0000000000400000-0x0000000000480000-memory.dmp

Filesize
512KB

Download
memory/2876-31-0x0000000000A40000-0x0000000000B02000-memory.dmp

Filesize
776KB

Download
memory/2876-29-0x0000000000620000-0x0000000000646000-memory.dmp

Filesize
152KB

Download
memory/2876-28-0x00000000059A0000-0x0000000005A9A000-memory.dmp

Filesize
1000KB

Download
memory/2876-27-0x0000000000B10000-0x0000000000C16000-memory.dmp

Filesize
1.0MB

Download
memory/2908-30-0x0000000070C5D000-0x0000000070C68000-memory.dmp

Filesize
44KB

Download
memory/2908-0-0x000000002F601000-0x000000002F602000-memory.dmp

Filesize
4KB

Download
memory/2908-1-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/2908-2-0x0000000070C5D000-0x0000000070C68000-memory.dmp

Filesize
44KB

Download

Analysis

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