remcos | 596479cd77e25e5d6dbf0b421afff049390813cc254ae90f86af00a10bdf6f90

Analysis

max time kernel
63s
max time network
9s
platform
windows7_x64
resource
win7v20201028
submitted
12-01-2021 14:12

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General

Target

i5TiYkAYkWJy1O8.exe
Size

772KB
MD5

e17a0488de5ca3c73672541143ee6927
SHA1

8a4c59f81c17710e665fb3e055dc1cbd28bc8ce6
SHA256

596479cd77e25e5d6dbf0b421afff049390813cc254ae90f86af00a10bdf6f90
SHA512

6766459cca6b6a25902973ca210e274241841e7acd2684ccb3f362040e3dbd568f1b430d305e773e50e0ec1e5e7cd879d8f3aff7d4cc30ce0a786be58555537d

Score

10^/10

remcos persistence rat

Malware Config

Extracted

Family

remcos

185.244.26.208:29100

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
Executes dropped EXE 1 IoCs

Processes:

remcos.exe

pid process

772 remcos.exe
Loads dropped DLL 6 IoCs

Processes:

cmd.exeWerFault.exe

pid process

1028 cmd.exe
2020 WerFault.exe
2020 WerFault.exe
2020 WerFault.exe
2020 WerFault.exe
2020 WerFault.exe

pid	process
772	remcos.exe

pid	process
1028	cmd.exe
2020	WerFault.exe
2020	WerFault.exe
2020	WerFault.exe
2020	WerFault.exe
2020	WerFault.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

i5TiYkAYkWJy1O8.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Windows\CurrentVersion\Run\	i5TiYkAYkWJy1O8.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\Remcos\\remcos.exe\""	i5TiYkAYkWJy1O8.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

i5TiYkAYkWJy1O8.exe

description pid process target process

PID 1068 set thread context of 760 1068 i5TiYkAYkWJy1O8.exe i5TiYkAYkWJy1O8.exe
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

2020 772 WerFault.exe remcos.exe
Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task
T1053

Processes:

schtasks.exe

pid process

2008 schtasks.exe
Suspicious behavior: EnumeratesProcesses 5 IoCs

Processes:

WerFault.exe

pid process

2020 WerFault.exe
2020 WerFault.exe
2020 WerFault.exe
2020 WerFault.exe
2020 WerFault.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

WerFault.exe

description pid process

Token: SeDebugPrivilege 2020 WerFault.exe

description	pid	process	target process
PID 1068 set thread context of 760	1068	i5TiYkAYkWJy1O8.exe	i5TiYkAYkWJy1O8.exe

pid	pid_target	process	target process
2020	772	WerFault.exe	remcos.exe

pid	process
2008	schtasks.exe

pid	process
2020	WerFault.exe
2020	WerFault.exe
2020	WerFault.exe
2020	WerFault.exe
2020	WerFault.exe

description	pid	process
Token: SeDebugPrivilege	2020	WerFault.exe

Suspicious use of WriteProcessMemory 31 IoCs

Processes:

i5TiYkAYkWJy1O8.exei5TiYkAYkWJy1O8.exeWScript.execmd.exeremcos.exe

description	pid	process	target process
PID 1068 wrote to memory of 2008	1068	i5TiYkAYkWJy1O8.exe	schtasks.exe
PID 1068 wrote to memory of 2008	1068	i5TiYkAYkWJy1O8.exe	schtasks.exe
PID 1068 wrote to memory of 2008	1068	i5TiYkAYkWJy1O8.exe	schtasks.exe
PID 1068 wrote to memory of 2008	1068	i5TiYkAYkWJy1O8.exe	schtasks.exe
PID 1068 wrote to memory of 760	1068	i5TiYkAYkWJy1O8.exe	i5TiYkAYkWJy1O8.exe
PID 1068 wrote to memory of 760	1068	i5TiYkAYkWJy1O8.exe	i5TiYkAYkWJy1O8.exe
PID 1068 wrote to memory of 760	1068	i5TiYkAYkWJy1O8.exe	i5TiYkAYkWJy1O8.exe
PID 1068 wrote to memory of 760	1068	i5TiYkAYkWJy1O8.exe	i5TiYkAYkWJy1O8.exe
PID 1068 wrote to memory of 760	1068	i5TiYkAYkWJy1O8.exe	i5TiYkAYkWJy1O8.exe
PID 1068 wrote to memory of 760	1068	i5TiYkAYkWJy1O8.exe	i5TiYkAYkWJy1O8.exe
PID 1068 wrote to memory of 760	1068	i5TiYkAYkWJy1O8.exe	i5TiYkAYkWJy1O8.exe
PID 1068 wrote to memory of 760	1068	i5TiYkAYkWJy1O8.exe	i5TiYkAYkWJy1O8.exe
PID 1068 wrote to memory of 760	1068	i5TiYkAYkWJy1O8.exe	i5TiYkAYkWJy1O8.exe
PID 1068 wrote to memory of 760	1068	i5TiYkAYkWJy1O8.exe	i5TiYkAYkWJy1O8.exe
PID 1068 wrote to memory of 760	1068	i5TiYkAYkWJy1O8.exe	i5TiYkAYkWJy1O8.exe
PID 760 wrote to memory of 1744	760	i5TiYkAYkWJy1O8.exe	WScript.exe
PID 760 wrote to memory of 1744	760	i5TiYkAYkWJy1O8.exe	WScript.exe
PID 760 wrote to memory of 1744	760	i5TiYkAYkWJy1O8.exe	WScript.exe
PID 760 wrote to memory of 1744	760	i5TiYkAYkWJy1O8.exe	WScript.exe
PID 1744 wrote to memory of 1028	1744	WScript.exe	cmd.exe
PID 1744 wrote to memory of 1028	1744	WScript.exe	cmd.exe
PID 1744 wrote to memory of 1028	1744	WScript.exe	cmd.exe
PID 1744 wrote to memory of 1028	1744	WScript.exe	cmd.exe
PID 1028 wrote to memory of 772	1028	cmd.exe	remcos.exe
PID 1028 wrote to memory of 772	1028	cmd.exe	remcos.exe
PID 1028 wrote to memory of 772	1028	cmd.exe	remcos.exe
PID 1028 wrote to memory of 772	1028	cmd.exe	remcos.exe
PID 772 wrote to memory of 2020	772	remcos.exe	WerFault.exe
PID 772 wrote to memory of 2020	772	remcos.exe	WerFault.exe
PID 772 wrote to memory of 2020	772	remcos.exe	WerFault.exe
PID 772 wrote to memory of 2020	772	remcos.exe	WerFault.exe

C:\Users\Admin\AppData\Local\Temp\i5TiYkAYkWJy1O8.exe
"C:\Users\Admin\AppData\Local\Temp\i5TiYkAYkWJy1O8.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1068

C:\Windows\SysWOW64\schtasks.exe
"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\LChCpmvhHgIatd" /XML "C:\Users\Admin\AppData\Local\Temp\tmpDBDE.tmp"
2⤵
- Creates scheduled task(s)
PID:2008

C:\Users\Admin\AppData\Local\Temp\i5TiYkAYkWJy1O8.exe
"C:\Users\Admin\AppData\Local\Temp\i5TiYkAYkWJy1O8.exe"
2⤵
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:760

C:\Windows\SysWOW64\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
3⤵
- Suspicious use of WriteProcessMemory
PID:1744

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe"
4⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1028

C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
5⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:772

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 772 -s 780
6⤵
- Loads dropped DLL
- Program crash
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2020

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Registry Run Keys / Startup Folder

T1060

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\install.vbs
MD5
b92d64fe5b1d1f59df4b738262aea8df

SHA1
c8fb1981759c2d9bb2ec91b705985fba5fc7af63

SHA256
fa20e9aab03dc8e9f1910aaf0cf42662379fa16ae3a22642084fb97fa3d4f83a

SHA512
2566248b93c0cfb0414f033b8dd18bbd4f88180093eac2861107289bcb4ee160f9593706ff1f7d1f2e4ecea430d67a5a2897551a4f9ebd82b707243e300520e2

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpDBDE.tmp
MD5
a68e94943cccc84bef9bd11324e9a050

SHA1
ef5870d486eef245699ccd804bd364b291bd428a

SHA256
39316e3f9f6bcd20112308830da5095324075ad989cd01c3053cb59a7c678bac

SHA512
22a831aee4a84958ca234159a078bb3117b78ebe2a92c452d44445452cbe6a052ed588088b320af2490ead172fe612de676a700a7c648f4f7fd196ada95e6c8e

Download Submit
C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
MD5
e17a0488de5ca3c73672541143ee6927

SHA1
8a4c59f81c17710e665fb3e055dc1cbd28bc8ce6

SHA256
596479cd77e25e5d6dbf0b421afff049390813cc254ae90f86af00a10bdf6f90

SHA512
6766459cca6b6a25902973ca210e274241841e7acd2684ccb3f362040e3dbd568f1b430d305e773e50e0ec1e5e7cd879d8f3aff7d4cc30ce0a786be58555537d

Download Submit
C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
MD5
e17a0488de5ca3c73672541143ee6927

SHA1
8a4c59f81c17710e665fb3e055dc1cbd28bc8ce6

SHA256
596479cd77e25e5d6dbf0b421afff049390813cc254ae90f86af00a10bdf6f90

SHA512
6766459cca6b6a25902973ca210e274241841e7acd2684ccb3f362040e3dbd568f1b430d305e773e50e0ec1e5e7cd879d8f3aff7d4cc30ce0a786be58555537d

Download Submit
\Users\Admin\AppData\Roaming\Remcos\remcos.exe
MD5
e17a0488de5ca3c73672541143ee6927

SHA1
8a4c59f81c17710e665fb3e055dc1cbd28bc8ce6

SHA256
596479cd77e25e5d6dbf0b421afff049390813cc254ae90f86af00a10bdf6f90

SHA512
6766459cca6b6a25902973ca210e274241841e7acd2684ccb3f362040e3dbd568f1b430d305e773e50e0ec1e5e7cd879d8f3aff7d4cc30ce0a786be58555537d

Download Submit
\Users\Admin\AppData\Roaming\Remcos\remcos.exe
MD5
e17a0488de5ca3c73672541143ee6927

SHA1
8a4c59f81c17710e665fb3e055dc1cbd28bc8ce6

SHA256
596479cd77e25e5d6dbf0b421afff049390813cc254ae90f86af00a10bdf6f90

SHA512
6766459cca6b6a25902973ca210e274241841e7acd2684ccb3f362040e3dbd568f1b430d305e773e50e0ec1e5e7cd879d8f3aff7d4cc30ce0a786be58555537d

Download Submit
\Users\Admin\AppData\Roaming\Remcos\remcos.exe
MD5
e17a0488de5ca3c73672541143ee6927

SHA1
8a4c59f81c17710e665fb3e055dc1cbd28bc8ce6

SHA256
596479cd77e25e5d6dbf0b421afff049390813cc254ae90f86af00a10bdf6f90

SHA512
6766459cca6b6a25902973ca210e274241841e7acd2684ccb3f362040e3dbd568f1b430d305e773e50e0ec1e5e7cd879d8f3aff7d4cc30ce0a786be58555537d

Download Submit
\Users\Admin\AppData\Roaming\Remcos\remcos.exe
MD5
e17a0488de5ca3c73672541143ee6927

SHA1
8a4c59f81c17710e665fb3e055dc1cbd28bc8ce6

SHA256
596479cd77e25e5d6dbf0b421afff049390813cc254ae90f86af00a10bdf6f90

SHA512
6766459cca6b6a25902973ca210e274241841e7acd2684ccb3f362040e3dbd568f1b430d305e773e50e0ec1e5e7cd879d8f3aff7d4cc30ce0a786be58555537d

Download Submit
\Users\Admin\AppData\Roaming\Remcos\remcos.exe
MD5
e17a0488de5ca3c73672541143ee6927

SHA1
8a4c59f81c17710e665fb3e055dc1cbd28bc8ce6

SHA256
596479cd77e25e5d6dbf0b421afff049390813cc254ae90f86af00a10bdf6f90

SHA512
6766459cca6b6a25902973ca210e274241841e7acd2684ccb3f362040e3dbd568f1b430d305e773e50e0ec1e5e7cd879d8f3aff7d4cc30ce0a786be58555537d

Download Submit
\Users\Admin\AppData\Roaming\Remcos\remcos.exe
MD5
e17a0488de5ca3c73672541143ee6927

SHA1
8a4c59f81c17710e665fb3e055dc1cbd28bc8ce6

SHA256
596479cd77e25e5d6dbf0b421afff049390813cc254ae90f86af00a10bdf6f90

SHA512
6766459cca6b6a25902973ca210e274241841e7acd2684ccb3f362040e3dbd568f1b430d305e773e50e0ec1e5e7cd879d8f3aff7d4cc30ce0a786be58555537d

Download Submit
memory/760-11-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/760-10-0x0000000000413FA4-mapping.dmp

Download
memory/760-9-0x0000000000400000-0x0000000000421000-memory.dmp

Filesize
132KB

Download
memory/772-21-0x0000000000E70000-0x0000000000E71000-memory.dmp

Filesize
4KB

Download
memory/772-18-0x0000000000000000-mapping.dmp

Download
memory/772-20-0x0000000074EE0000-0x00000000755CE000-memory.dmp

Filesize
6.9MB

Download
memory/1028-14-0x0000000000000000-mapping.dmp

Download
memory/1068-2-0x0000000074EE0000-0x00000000755CE000-memory.dmp

Filesize
6.9MB

Download
memory/1068-6-0x00000000050F0000-0x000000000514F000-memory.dmp

Filesize
380KB

Download
memory/1068-5-0x0000000000410000-0x0000000000422000-memory.dmp

Filesize
72KB

Download
memory/1068-3-0x0000000000FF0000-0x0000000000FF1000-memory.dmp

Filesize
4KB

Download
memory/1744-15-0x00000000027C0000-0x00000000027C4000-memory.dmp

Filesize
16KB

Download
memory/1744-12-0x0000000000000000-mapping.dmp

Download
memory/2008-7-0x0000000000000000-mapping.dmp

Download
memory/2020-23-0x0000000000000000-mapping.dmp

Download
memory/2020-24-0x00000000020C0000-0x00000000020D1000-memory.dmp

Filesize
68KB

Download