remcos | c4ec288c3ae80a59a799b95facdccf7a1678f8d4d354d2c07019f078c2d90988

General

Target

lib64.exe
Size

2.6MB
MD5

547805ed81de01127783eb1800aefc84
SHA1

ae79257049ca56a315245233c29e88e55852d269
SHA256

c4ec288c3ae80a59a799b95facdccf7a1678f8d4d354d2c07019f078c2d90988
SHA512

9358c138a8d985c55873ec0246bcb91041d1dd386240e7f5767cb97be29e3abe7ccde066bca2c4c29f187a67758a5efa4eaf81bbd749256c068866f4fc0ad631
SSDEEP

49152:o90L3Cwdt5qXwDGhLvA3WngsmwS1eU3yKy4qfEb95TABPLdSdcm2JwY:NL3Cw/5DGhLvA5XwS1TiKy4fDT8PLYda

Score

10^/10

remcos remotehost persistence rat

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

206.188.197.133:2404

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
servicedir.exe
copy_folder
rootdir
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-2AH6QY
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
servicedir
take_screenshot_option
false
take_screenshot_time
5

Signatures

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

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

lib64.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-4063495947-34355257-727531523-1000\Software\Microsoft\Windows\CurrentVersion\Run\libinfo = "\"C:\\Users\\Admin\\AppData\\Roaming\\lib32\\libinfo.exe\""	lib64.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

lib64.exe

description pid process target process

PID 1724 set thread context of 1236 1724 lib64.exe lib64.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

powershell.exe

pid process

112 powershell.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

lib64.exepowershell.exe

description pid process

Token: SeDebugPrivilege 1724 lib64.exe
Token: SeDebugPrivilege 112 powershell.exe

description	pid	process	target process
PID 1724 set thread context of 1236	1724	lib64.exe	lib64.exe

pid	process
112	powershell.exe

description	pid	process
Token: SeDebugPrivilege	1724	lib64.exe
Token: SeDebugPrivilege	112	powershell.exe

Suspicious use of WriteProcessMemory 17 IoCs

Processes:

lib64.exe

description	pid	process	target process
PID 1724 wrote to memory of 112	1724	lib64.exe	powershell.exe
PID 1724 wrote to memory of 112	1724	lib64.exe	powershell.exe
PID 1724 wrote to memory of 112	1724	lib64.exe	powershell.exe
PID 1724 wrote to memory of 112	1724	lib64.exe	powershell.exe
PID 1724 wrote to memory of 1236	1724	lib64.exe	lib64.exe
PID 1724 wrote to memory of 1236	1724	lib64.exe	lib64.exe
PID 1724 wrote to memory of 1236	1724	lib64.exe	lib64.exe
PID 1724 wrote to memory of 1236	1724	lib64.exe	lib64.exe
PID 1724 wrote to memory of 1236	1724	lib64.exe	lib64.exe
PID 1724 wrote to memory of 1236	1724	lib64.exe	lib64.exe
PID 1724 wrote to memory of 1236	1724	lib64.exe	lib64.exe
PID 1724 wrote to memory of 1236	1724	lib64.exe	lib64.exe
PID 1724 wrote to memory of 1236	1724	lib64.exe	lib64.exe
PID 1724 wrote to memory of 1236	1724	lib64.exe	lib64.exe
PID 1724 wrote to memory of 1236	1724	lib64.exe	lib64.exe
PID 1724 wrote to memory of 1236	1724	lib64.exe	lib64.exe
PID 1724 wrote to memory of 1236	1724	lib64.exe	lib64.exe

C:\Users\Admin\AppData\Local\Temp\lib64.exe
"C:\Users\Admin\AppData\Local\Temp\lib64.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1724

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -enc UwB0AGEAcgB0AC0AUwBsAGUAZQBwACAALQBTAGUAYwBvAG4AZABzACAAMwA1AA==
2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:112

C:\Users\Admin\AppData\Local\Temp\lib64.exe
C:\Users\Admin\AppData\Local\Temp\lib64.exe
2⤵
PID:1236

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

memory/112-59-0x000000006E7B0000-0x000000006ED5B000-memory.dmp

Filesize
5.7MB

Download
memory/112-61-0x000000006E7B0000-0x000000006ED5B000-memory.dmp

Filesize
5.7MB

Download
memory/112-60-0x000000006E7B0000-0x000000006ED5B000-memory.dmp

Filesize
5.7MB

Download
memory/112-57-0x0000000000000000-mapping.dmp

Download
memory/1236-67-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1236-68-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1236-80-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1236-62-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1236-63-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1236-65-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1236-79-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1236-78-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1236-69-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1236-70-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1236-72-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1236-74-0x0000000000400000-0x000000000047F000-memory.dmp

Filesize
508KB

Download
memory/1236-75-0x00000000004327A4-mapping.dmp

Download
memory/1724-56-0x0000000005190000-0x00000000053EC000-memory.dmp

Filesize
2.4MB

Download
memory/1724-54-0x0000000000B70000-0x0000000000E08000-memory.dmp

Filesize
2.6MB

Download
memory/1724-55-0x0000000074DC1000-0x0000000074DC3000-memory.dmp

Filesize
8KB

Download

Analysis

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