remcos | fa65633c1499e432ebb65631a87c4b0fc225f74468e6369b9c119406bed32cd5

General

Target

Drawings 86565278254-CP20202705,pdf.exe
Size

314KB
MD5

4ee009b6aa38a721c2d0b3820e0a1a18
SHA1

24dd9a3896a3af768b31f3224584e50757013536
SHA256

45b6db1de3c17ed66daa45bd11b1b2b1001a0060fab695635f1cec62400f007d
SHA512

4f750b0cd349ab46b9618f8a3145b6b44e75f11c11f8a3f72b8626d531beb834f6726ab1a14157790c06c2fc24015baf4f46e1bcb17870edffde4010869bcfda

Score

10^/10

remcos from jah coreentity rat rezer0

Malware Config

Extracted

Family

remcos

Version

2.5.0 Pro

Botnet

FROM JAH

C2

newdawn4me.ddns.net:7213

Attributes

audio_folder
MicRecords
audio_path
%AppData%
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
install_path
%AppData%
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
keylog_path
%AppData%
mouse_option
false
mutex
Remcos-4F6INU
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
remcos
take_screenshot_option
false
take_screenshot_time
5
take_screenshot_title
wikipedia;solitaire;

Signatures

CoreEntity .NET Packer 1 IoCs

A .NET packer called CoreEntity where it has embedded the payload as a BitMap object which is later decrypted.

coreentity

Processes:

resource	yara_rule
behavioral1/memory/240-56-0x00000000004E0000-0x00000000004E8000-memory.dmp	coreentity

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

ReZer0 packer 1 IoCs

Detects ReZer0, a packer with multiple versions used in various campaigns.

rezer0

Processes:

resource	yara_rule
behavioral1/memory/240-57-0x0000000000C00000-0x0000000000C2C000-memory.dmp	rezer0

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064
Suspicious use of SetThreadContext 1 IoCs

Processes:

Drawings 86565278254-CP20202705,pdf.exe

description pid process target process

PID 240 set thread context of 888 240 Drawings 86565278254-CP20202705,pdf.exe vbc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
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

1304 schtasks.exe
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

Drawings 86565278254-CP20202705,pdf.exe

pid process

240 Drawings 86565278254-CP20202705,pdf.exe
240 Drawings 86565278254-CP20202705,pdf.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

Drawings 86565278254-CP20202705,pdf.exe

description pid process

Token: SeDebugPrivilege 240 Drawings 86565278254-CP20202705,pdf.exe

description	pid	process	target process
PID 240 set thread context of 888	240	Drawings 86565278254-CP20202705,pdf.exe	vbc.exe

pid	process
1304	schtasks.exe

pid	process
240	Drawings 86565278254-CP20202705,pdf.exe
240	Drawings 86565278254-CP20202705,pdf.exe

description	pid	process
Token: SeDebugPrivilege	240	Drawings 86565278254-CP20202705,pdf.exe

Suspicious use of WriteProcessMemory 19 IoCs

Processes:

Drawings 86565278254-CP20202705,pdf.exe

description	pid	process	target process
PID 240 wrote to memory of 1304	240	Drawings 86565278254-CP20202705,pdf.exe	schtasks.exe
PID 240 wrote to memory of 1304	240	Drawings 86565278254-CP20202705,pdf.exe	schtasks.exe
PID 240 wrote to memory of 1304	240	Drawings 86565278254-CP20202705,pdf.exe	schtasks.exe
PID 240 wrote to memory of 1304	240	Drawings 86565278254-CP20202705,pdf.exe	schtasks.exe
PID 240 wrote to memory of 892	240	Drawings 86565278254-CP20202705,pdf.exe	vbc.exe
PID 240 wrote to memory of 892	240	Drawings 86565278254-CP20202705,pdf.exe	vbc.exe
PID 240 wrote to memory of 892	240	Drawings 86565278254-CP20202705,pdf.exe	vbc.exe
PID 240 wrote to memory of 892	240	Drawings 86565278254-CP20202705,pdf.exe	vbc.exe
PID 240 wrote to memory of 888	240	Drawings 86565278254-CP20202705,pdf.exe	vbc.exe
PID 240 wrote to memory of 888	240	Drawings 86565278254-CP20202705,pdf.exe	vbc.exe
PID 240 wrote to memory of 888	240	Drawings 86565278254-CP20202705,pdf.exe	vbc.exe
PID 240 wrote to memory of 888	240	Drawings 86565278254-CP20202705,pdf.exe	vbc.exe
PID 240 wrote to memory of 888	240	Drawings 86565278254-CP20202705,pdf.exe	vbc.exe
PID 240 wrote to memory of 888	240	Drawings 86565278254-CP20202705,pdf.exe	vbc.exe
PID 240 wrote to memory of 888	240	Drawings 86565278254-CP20202705,pdf.exe	vbc.exe
PID 240 wrote to memory of 888	240	Drawings 86565278254-CP20202705,pdf.exe	vbc.exe
PID 240 wrote to memory of 888	240	Drawings 86565278254-CP20202705,pdf.exe	vbc.exe
PID 240 wrote to memory of 888	240	Drawings 86565278254-CP20202705,pdf.exe	vbc.exe
PID 240 wrote to memory of 888	240	Drawings 86565278254-CP20202705,pdf.exe	vbc.exe

C:\Users\Admin\AppData\Local\Temp\Drawings 86565278254-CP20202705,pdf.exe
"C:\Users\Admin\AppData\Local\Temp\Drawings 86565278254-CP20202705,pdf.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:240

C:\Windows\SysWOW64\schtasks.exe
"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\QuEmCwmtBIbeLr" /XML "C:\Users\Admin\AppData\Local\Temp\tmpB942.tmp"
2⤵
- Creates scheduled task(s)
PID:1304

C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
"{path}"
2⤵
PID:892

C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
"{path}"
2⤵
PID:888

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scripting

1

T1064

Scheduled Task

1

T1053

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Scripting

1

T1064

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpB942.tmp
Filesize
1KB

MD5
fb137e32489d46d90a9185a80a18e9f8

SHA1
1e70edc10a95bdf8ea66bec3acfac40afc932905

SHA256
8fdcb96abc09bb567bc6aac1878acba0164ec2a0a110edc81809bcd7d0a490d5

SHA512
dcb3dad05d8761be14f4a545645078623584d30c106d9dbadbcfa9c33c622871c8cd570272bb7eaaab706426572079f492fc5f736c54af778f3c8a92d489562a

Download Submit
memory/240-55-0x00000000757C1000-0x00000000757C3000-memory.dmp

Filesize
8KB

Download
memory/240-56-0x00000000004E0000-0x00000000004E8000-memory.dmp

Filesize
32KB

Download
memory/240-57-0x0000000000C00000-0x0000000000C2C000-memory.dmp

Filesize
176KB

Download
memory/240-54-0x0000000000EF0000-0x0000000000F44000-memory.dmp

Filesize
336KB

Download
memory/888-69-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/888-60-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/888-61-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/888-63-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/888-66-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/888-65-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/888-67-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/888-70-0x0000000000413A84-mapping.dmp

Download
memory/888-73-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/888-74-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/1304-58-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

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Downloads