remcos | 6201c84444a1047e33e7ce68bf998d9470b950f76ec919322c1f24c865ba547d

General

Target

New Order # 8558497.exe
Size

395KB
MD5

1bb8ba2c732f0401a2b2fb80c546ae29
SHA1

4db89e355f30bede562ee9959ce662a06ac7475e
SHA256

a006ce3d5e86dac171acaeac9ffeab9172a5ff4daceca820df5d05f87f0cf6ff
SHA512

3664c862ca54341ef530eabcb26ee84739a9fdbd3de252421fb9c67b6b0d9d5acc562c968d49d4ee66df3e2b4412368b641eb6ff671280beae06741bb1960eed

Score

10^/10

remcos remotehost coreentity rat rezer0

Malware Config

Extracted

Family

remcos

Version

2.5.0 Pro

Botnet

RemoteHost

C2

dolxxrem.hopto.org:3086

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-B3XNCF
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/2020-56-0x00000000003A0000-0x00000000003A8000-memory.dmp	coreentity

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

CoreCCC Packer 1 IoCs

Detects CoreCCC packer used to load .NET malware.

Processes:

resource	yara_rule
behavioral1/memory/2020-54-0x00000000009B0000-0x0000000000A18000-memory.dmp	coreccc

ReZer0 packer 1 IoCs

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

rezer0

Processes:

resource	yara_rule
behavioral1/memory/2020-57-0x0000000002090000-0x00000000020BC000-memory.dmp	rezer0

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064
Suspicious use of SetThreadContext 1 IoCs

Processes:

New Order # 8558497.exe

description pid process target process

PID 2020 set thread context of 764 2020 New Order # 8558497.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

1532 schtasks.exe
Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

New Order # 8558497.exe

pid process

2020 New Order # 8558497.exe
2020 New Order # 8558497.exe
2020 New Order # 8558497.exe
2020 New Order # 8558497.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

New Order # 8558497.exe

description pid process

Token: SeDebugPrivilege 2020 New Order # 8558497.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

vbc.exe

pid process

764 vbc.exe

description	pid	process	target process
PID 2020 set thread context of 764	2020	New Order # 8558497.exe	vbc.exe

pid	process
1532	schtasks.exe

pid	process
2020	New Order # 8558497.exe
2020	New Order # 8558497.exe
2020	New Order # 8558497.exe
2020	New Order # 8558497.exe

description	pid	process
Token: SeDebugPrivilege	2020	New Order # 8558497.exe

pid	process
764	vbc.exe

Suspicious use of WriteProcessMemory 27 IoCs

Processes:

New Order # 8558497.exe

description	pid	process	target process
PID 2020 wrote to memory of 1532	2020	New Order # 8558497.exe	schtasks.exe
PID 2020 wrote to memory of 1532	2020	New Order # 8558497.exe	schtasks.exe
PID 2020 wrote to memory of 1532	2020	New Order # 8558497.exe	schtasks.exe
PID 2020 wrote to memory of 1532	2020	New Order # 8558497.exe	schtasks.exe
PID 2020 wrote to memory of 1348	2020	New Order # 8558497.exe	vbc.exe
PID 2020 wrote to memory of 1348	2020	New Order # 8558497.exe	vbc.exe
PID 2020 wrote to memory of 1348	2020	New Order # 8558497.exe	vbc.exe
PID 2020 wrote to memory of 1348	2020	New Order # 8558497.exe	vbc.exe
PID 2020 wrote to memory of 844	2020	New Order # 8558497.exe	vbc.exe
PID 2020 wrote to memory of 844	2020	New Order # 8558497.exe	vbc.exe
PID 2020 wrote to memory of 844	2020	New Order # 8558497.exe	vbc.exe
PID 2020 wrote to memory of 844	2020	New Order # 8558497.exe	vbc.exe
PID 2020 wrote to memory of 888	2020	New Order # 8558497.exe	vbc.exe
PID 2020 wrote to memory of 888	2020	New Order # 8558497.exe	vbc.exe
PID 2020 wrote to memory of 888	2020	New Order # 8558497.exe	vbc.exe
PID 2020 wrote to memory of 888	2020	New Order # 8558497.exe	vbc.exe
PID 2020 wrote to memory of 764	2020	New Order # 8558497.exe	vbc.exe
PID 2020 wrote to memory of 764	2020	New Order # 8558497.exe	vbc.exe
PID 2020 wrote to memory of 764	2020	New Order # 8558497.exe	vbc.exe
PID 2020 wrote to memory of 764	2020	New Order # 8558497.exe	vbc.exe
PID 2020 wrote to memory of 764	2020	New Order # 8558497.exe	vbc.exe
PID 2020 wrote to memory of 764	2020	New Order # 8558497.exe	vbc.exe
PID 2020 wrote to memory of 764	2020	New Order # 8558497.exe	vbc.exe
PID 2020 wrote to memory of 764	2020	New Order # 8558497.exe	vbc.exe
PID 2020 wrote to memory of 764	2020	New Order # 8558497.exe	vbc.exe
PID 2020 wrote to memory of 764	2020	New Order # 8558497.exe	vbc.exe
PID 2020 wrote to memory of 764	2020	New Order # 8558497.exe	vbc.exe

C:\Users\Admin\AppData\Local\Temp\New Order # 8558497.exe
"C:\Users\Admin\AppData\Local\Temp\New Order # 8558497.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2020
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\HLCfWZiFHTlZm" /XML "C:\Users\Admin\AppData\Local\Temp\tmpE4B5.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:1532
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
  "{path}"
  2⤵
  PID:1348
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
  "{path}"
  2⤵
  PID:844
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
  "{path}"
  2⤵
  PID:888
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\vbc.exe
  "{path}"
  2⤵
  - Suspicious use of SetWindowsHookEx
  PID:764

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

Scripting

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

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpE4B5.tmp

Filesize
1KB

MD5
e520e3b41cdeeb5e1c8bcb148188f76b

SHA1
042733f0da70e585533af4986a411660b8f917f0

SHA256
eb98ec682ff8e6c307bd58c69c9ac1ed20b9d38a0c0ce5e43bd1b8ec323b28da

SHA512
71a62dfe14b9ff6cb05d6fa7be7b57b7e6bfca1c328f965fb0a4e37993c0a3d394c93630f7996e08e64edd631e7c6478176455c81170f749b4f85d08a3a390a9

Download Submit
memory/764-69-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/764-67-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/764-74-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/764-73-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/764-70-0x0000000000413A84-mapping.dmp

Download
memory/764-60-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/764-63-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/764-65-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/764-61-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/764-66-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/1532-58-0x0000000000000000-mapping.dmp

Download
memory/2020-56-0x00000000003A0000-0x00000000003A8000-memory.dmp

Filesize
32KB

Download
memory/2020-54-0x00000000009B0000-0x0000000000A18000-memory.dmp

Filesize
416KB

Download
memory/2020-55-0x00000000759F1000-0x00000000759F3000-memory.dmp

Filesize
8KB

Download
memory/2020-57-0x0000000002090000-0x00000000020BC000-memory.dmp

Filesize
176KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads