remcos | e82b61f4de99bd8bc63202a52945726ff8dd14b0fd7b60a2c0b6f4f87d3974fe

General

Target

obax.exe
Size

1.3MB
MD5

9fc81fa529ddcecfeb3d155f77320d62
SHA1

50c9e3d1e66afc0bccf61db4be597d0c566ead54
SHA256

1468bc256c278d1cb79771e2ab7a44f63f05ce2bc48746d6c2f069b1125593ec
SHA512

62fb3f252da77dd4357bad5bdb855218860aa66f99f83d55b02bddc25f2b3f706f684170331898fcbb976747f6f3c7dbbe227c3a9ed093ef0f5a31ef55e17b64
SSDEEP

24576:etb20pkaCqT5TBWgNQ7aTwifkAN443Vfx6A:LVg5tQ7aTwO5/v5

Score

10^/10

remcos remotehost discovery rat

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

192.3.64.152:2559

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
false
install_flag
false
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-ZFXG9Y
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
take_screenshot_option
false
take_screenshot_time
5

Signatures

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

Drops startup file 1 IoCs

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

Executes dropped EXE 1 IoCs

pid	Process
2500	phytographic.exe

Loads dropped DLL 1 IoCs

pid	Process
1628	obax.exe

AutoIT Executable 1 IoCs

AutoIT scripts compiled to PE executables.

resource	yara_rule
behavioral1/files/0x00070000000173f6-8.dat	autoit_exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2500 set thread context of 2088	2500	phytographic.exe	32
PID 2088 set thread context of 2668	2088	svchost.exe	33

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	obax.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	phytographic.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2088	svchost.exe

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
2500	phytographic.exe
2088	svchost.exe

Suspicious use of FindShellTrayWindow 4 IoCs

pid	Process
1628	obax.exe
1628	obax.exe
2500	phytographic.exe
2500	phytographic.exe

Suspicious use of SendNotifyMessage 4 IoCs

pid	Process
1628	obax.exe
1628	obax.exe
2500	phytographic.exe
2500	phytographic.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 1628 wrote to memory of 2500	1628	obax.exe	31
PID 1628 wrote to memory of 2500	1628	obax.exe	31
PID 1628 wrote to memory of 2500	1628	obax.exe	31
PID 1628 wrote to memory of 2500	1628	obax.exe	31
PID 2500 wrote to memory of 2088	2500	phytographic.exe	32
PID 2500 wrote to memory of 2088	2500	phytographic.exe	32
PID 2500 wrote to memory of 2088	2500	phytographic.exe	32
PID 2500 wrote to memory of 2088	2500	phytographic.exe	32
PID 2500 wrote to memory of 2088	2500	phytographic.exe	32
PID 2088 wrote to memory of 2668	2088	svchost.exe	33
PID 2088 wrote to memory of 2668	2088	svchost.exe	33
PID 2088 wrote to memory of 2668	2088	svchost.exe	33
PID 2088 wrote to memory of 2668	2088	svchost.exe	33
PID 2088 wrote to memory of 2668	2088	svchost.exe	33

C:\Users\Admin\AppData\Local\Temp\obax.exe
"C:\Users\Admin\AppData\Local\Temp\obax.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:1628
- C:\Users\Admin\AppData\Local\differences\phytographic.exe
  "C:\Users\Admin\AppData\Local\Temp\obax.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:2500
- - C:\Windows\SysWOW64\svchost.exe
    "C:\Users\Admin\AppData\Local\Temp\obax.exe"
    3⤵
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of WriteProcessMemory
    PID:2088
  - - C:\Windows\SysWOW64\svchost.exe
      C:\Windows\System32\svchost.exe
      4⤵
      PID:2668

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

\Users\Admin\AppData\Local\differences\phytographic.exe

Filesize
1.3MB

MD5
9fc81fa529ddcecfeb3d155f77320d62

SHA1
50c9e3d1e66afc0bccf61db4be597d0c566ead54

SHA256
1468bc256c278d1cb79771e2ab7a44f63f05ce2bc48746d6c2f069b1125593ec

SHA512
62fb3f252da77dd4357bad5bdb855218860aa66f99f83d55b02bddc25f2b3f706f684170331898fcbb976747f6f3c7dbbe227c3a9ed093ef0f5a31ef55e17b64

Download Submit
memory/1628-6-0x00000000009F0000-0x0000000000DF0000-memory.dmp

Filesize
4.0MB

Download
memory/2088-22-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2088-25-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2088-24-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2088-31-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/2500-20-0x0000000000BF0000-0x0000000000FF0000-memory.dmp

Filesize
4.0MB

Download
memory/2668-28-0x0000000000080000-0x0000000000088000-memory.dmp

Filesize
32KB

Download
memory/2668-32-0x0000000000080000-0x0000000000088000-memory.dmp

Filesize
32KB

Download
memory/2668-30-0x0000000000080000-0x0000000000088000-memory.dmp

Filesize
32KB

Download
memory/2668-26-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download

Analysis

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