remcos | 1943df8688bbc02b45e5f91882b3408a654893168cdcf07e2bea8b507f7131e5

General

Target

d24d76d03365122aa5a4a7828a2d14368066da840ae8945cf595a6b17ceca700.exe
Size

807KB
MD5

b17e1003bb9bbe58e090c7752447c016
SHA1

a159b486e535469d4c49b227d27608f2ad48288e
SHA256

d24d76d03365122aa5a4a7828a2d14368066da840ae8945cf595a6b17ceca700
SHA512

05077e35558e1bb636596d7a8c6b66f9554ecf8e057f61c3cf7f4af91c19f898943a5dc8b1f13914b231e09671a36631e2490e0b32799250537a375dad83af3a
SSDEEP

24576:4BXu9HGaVHUVeaBzcvMgTvk+39ABn8ApTZl:4w9VHUVebvjT19ABfp

Score

10^/10

remcos remotehost discovery rat upx

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

45.95.169.104:2404

Attributes

audio_folder
MicRecords
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
true
install_flag
false
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-S3AD48
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
take_screenshot_option
false
take_screenshot_time
5

Signatures

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

Drops startup file 1 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\name.vbs	name.exe

Executes dropped EXE 1 IoCs

pid	Process
536	name.exe

UPX packed file 5 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/3928-0-0x0000000000180000-0x0000000000341000-memory.dmp	upx
behavioral2/files/0x0002000000022d12-15.dat	upx
behavioral2/memory/536-16-0x0000000000710000-0x00000000008D1000-memory.dmp	upx
behavioral2/memory/3928-19-0x0000000000180000-0x0000000000341000-memory.dmp	upx
behavioral2/memory/536-38-0x0000000000710000-0x00000000008D1000-memory.dmp	upx

AutoIT Executable 2 IoCs

AutoIT scripts compiled to PE executables.

resource	yara_rule
behavioral2/memory/3928-19-0x0000000000180000-0x0000000000341000-memory.dmp	autoit_exe
behavioral2/memory/536-38-0x0000000000710000-0x00000000008D1000-memory.dmp	autoit_exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 536 set thread context of 1864	536	name.exe	88

System Location Discovery: System Language Discovery 1 TTPs 3 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	d24d76d03365122aa5a4a7828a2d14368066da840ae8945cf595a6b17ceca700.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	name.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
536	name.exe

Suspicious use of FindShellTrayWindow 4 IoCs

pid	Process
3928	d24d76d03365122aa5a4a7828a2d14368066da840ae8945cf595a6b17ceca700.exe
3928	d24d76d03365122aa5a4a7828a2d14368066da840ae8945cf595a6b17ceca700.exe
536	name.exe
536	name.exe

Suspicious use of SendNotifyMessage 4 IoCs

pid	Process
3928	d24d76d03365122aa5a4a7828a2d14368066da840ae8945cf595a6b17ceca700.exe
3928	d24d76d03365122aa5a4a7828a2d14368066da840ae8945cf595a6b17ceca700.exe
536	name.exe
536	name.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1864	svchost.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 3928 wrote to memory of 536	3928	d24d76d03365122aa5a4a7828a2d14368066da840ae8945cf595a6b17ceca700.exe	86
PID 3928 wrote to memory of 536	3928	d24d76d03365122aa5a4a7828a2d14368066da840ae8945cf595a6b17ceca700.exe	86
PID 3928 wrote to memory of 536	3928	d24d76d03365122aa5a4a7828a2d14368066da840ae8945cf595a6b17ceca700.exe	86
PID 536 wrote to memory of 1864	536	name.exe	88
PID 536 wrote to memory of 1864	536	name.exe	88
PID 536 wrote to memory of 1864	536	name.exe	88
PID 536 wrote to memory of 1864	536	name.exe	88

C:\Users\Admin\AppData\Local\Temp\d24d76d03365122aa5a4a7828a2d14368066da840ae8945cf595a6b17ceca700.exe
"C:\Users\Admin\AppData\Local\Temp\d24d76d03365122aa5a4a7828a2d14368066da840ae8945cf595a6b17ceca700.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:3928
- C:\Users\Admin\AppData\Local\directory\name.exe
  "C:\Users\Admin\AppData\Local\Temp\d24d76d03365122aa5a4a7828a2d14368066da840ae8945cf595a6b17ceca700.exe"
  2⤵
  - Drops startup file
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:536
- - C:\Windows\SysWOW64\svchost.exe
    "C:\Users\Admin\AppData\Local\Temp\d24d76d03365122aa5a4a7828a2d14368066da840ae8945cf595a6b17ceca700.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    PID:1864

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

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

C:\ProgramData\remcos\logs.dat

Filesize
184B

MD5
0686dd2d3d971e07507a8f44323da2a1

SHA1
fc6b11087d326639509032f2b6ab7f084777ff65

SHA256
62639bac8cfb28d9b6c8b65fa76a2bb77b9a34cd89b3b2543204ca08e5b95faa

SHA512
3cd274ec51627a4c0e9ddaa87a88a8fbaf5cd624fef8499459120aed630a5799c78c5c07f0ab15f71dd4020409edb68aee372dd2e65f6037adbe311a6b5c69a4

Download Submit
C:\Users\Admin\AppData\Local\Temp\Lymnaeidae

Filesize
483KB

MD5
d27901a98fcf9ba932e53c7450496f09

SHA1
423db92cd7d8ef22a1f486a4547bd3b473ecc4a1

SHA256
986efa4e9a46ab0d0091cd50c8cf22101fe87c21729ce6d90b9441a6448e7071

SHA512
a811201954a1f9998717621fe1f9305e1f2de2fd2d1b96bee1660e2235c4b5a63b9cfd10f52fd39810373ffc365281e3be3316321a1c626064b2b1481936fe8d

Download Submit
C:\Users\Admin\AppData\Local\Temp\intemeration

Filesize
252KB

MD5
853be9124b51e48f5d850a835321ce11

SHA1
27873a837151fb53b7656c34a565745b84e38342

SHA256
bb2a93bd61d6f95e4c9f0d4129d38633270df2128c57b97f5406655861030d0b

SHA512
192d1b16b630ba3237f19f5bad187304b035c2c5c07af9db05c7f4df763121d8b682a732d8728068dd92bd3d6bef2ed98c8c3efffd0cfc87126894108e1b23fd

Download Submit
C:\Users\Admin\AppData\Local\directory\name.exe

Filesize
807KB

MD5
b17e1003bb9bbe58e090c7752447c016

SHA1
a159b486e535469d4c49b227d27608f2ad48288e

SHA256
d24d76d03365122aa5a4a7828a2d14368066da840ae8945cf595a6b17ceca700

SHA512
05077e35558e1bb636596d7a8c6b66f9554ecf8e057f61c3cf7f4af91c19f898943a5dc8b1f13914b231e09671a36631e2490e0b32799250537a375dad83af3a

Download Submit
memory/536-16-0x0000000000710000-0x00000000008D1000-memory.dmp

Filesize
1.8MB

Download
memory/536-38-0x0000000000710000-0x00000000008D1000-memory.dmp

Filesize
1.8MB

Download
memory/1864-44-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1864-51-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1864-35-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1864-37-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1864-39-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1864-84-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1864-40-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1864-43-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1864-83-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1864-48-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1864-78-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1864-34-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1864-52-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1864-57-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1864-58-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1864-63-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1864-65-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1864-70-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1864-71-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/1864-76-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/3928-12-0x0000000003EC0000-0x0000000003EC4000-memory.dmp

Filesize
16KB

Download
memory/3928-0-0x0000000000180000-0x0000000000341000-memory.dmp

Filesize
1.8MB

Download
memory/3928-19-0x0000000000180000-0x0000000000341000-memory.dmp

Filesize
1.8MB

Download

Analysis

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