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 3 IoCs

pid	Process
4240	phytographic.exe
216	phytographic.exe
3640	phytographic.exe

AutoIT Executable 1 IoCs

AutoIT scripts compiled to PE executables.

resource	yara_rule
behavioral2/files/0x000a000000023c97-9.dat	autoit_exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3640 set thread context of 4856	3640	phytographic.exe	91
PID 4856 set thread context of 5012	4856	svchost.exe	92

System Location Discovery: System Language Discovery 1 TTPs 5 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	phytographic.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 2 IoCs

pid	Process
4856	svchost.exe
4856	svchost.exe

Suspicious behavior: MapViewOfSection 4 IoCs

pid	Process
4240	phytographic.exe
216	phytographic.exe
3640	phytographic.exe
4856	svchost.exe

Suspicious use of FindShellTrayWindow 8 IoCs

pid	Process
1184	obax.exe
1184	obax.exe
4240	phytographic.exe
4240	phytographic.exe
216	phytographic.exe
216	phytographic.exe
3640	phytographic.exe
3640	phytographic.exe

Suspicious use of SendNotifyMessage 8 IoCs

pid	Process
1184	obax.exe
1184	obax.exe
4240	phytographic.exe
4240	phytographic.exe
216	phytographic.exe
216	phytographic.exe
3640	phytographic.exe
3640	phytographic.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 1184 wrote to memory of 4240	1184	obax.exe	82
PID 1184 wrote to memory of 4240	1184	obax.exe	82
PID 1184 wrote to memory of 4240	1184	obax.exe	82
PID 4240 wrote to memory of 3212	4240	phytographic.exe	83
PID 4240 wrote to memory of 3212	4240	phytographic.exe	83
PID 4240 wrote to memory of 3212	4240	phytographic.exe	83
PID 4240 wrote to memory of 216	4240	phytographic.exe	84
PID 4240 wrote to memory of 216	4240	phytographic.exe	84
PID 4240 wrote to memory of 216	4240	phytographic.exe	84
PID 216 wrote to memory of 4500	216	phytographic.exe	87
PID 216 wrote to memory of 4500	216	phytographic.exe	87
PID 216 wrote to memory of 4500	216	phytographic.exe	87
PID 216 wrote to memory of 3640	216	phytographic.exe	88
PID 216 wrote to memory of 3640	216	phytographic.exe	88
PID 216 wrote to memory of 3640	216	phytographic.exe	88
PID 3640 wrote to memory of 4856	3640	phytographic.exe	91
PID 3640 wrote to memory of 4856	3640	phytographic.exe	91
PID 3640 wrote to memory of 4856	3640	phytographic.exe	91
PID 3640 wrote to memory of 4856	3640	phytographic.exe	91
PID 4856 wrote to memory of 5012	4856	svchost.exe	92
PID 4856 wrote to memory of 5012	4856	svchost.exe	92
PID 4856 wrote to memory of 5012	4856	svchost.exe	92
PID 4856 wrote to memory of 5012	4856	svchost.exe	92

C:\Users\Admin\AppData\Local\Temp\obax.exe
"C:\Users\Admin\AppData\Local\Temp\obax.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:1184
- C:\Users\Admin\AppData\Local\differences\phytographic.exe
  "C:\Users\Admin\AppData\Local\Temp\obax.exe"
  2⤵
  - Drops startup file
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:4240
- - C:\Windows\SysWOW64\svchost.exe
    "C:\Users\Admin\AppData\Local\Temp\obax.exe"
    3⤵
    PID:3212
- - C:\Users\Admin\AppData\Local\differences\phytographic.exe
    "C:\Users\Admin\AppData\Local\differences\phytographic.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of FindShellTrayWindow
    - Suspicious use of SendNotifyMessage
    - Suspicious use of WriteProcessMemory
    PID:216
  - - C:\Windows\SysWOW64\svchost.exe
      "C:\Users\Admin\AppData\Local\differences\phytographic.exe"
      4⤵
      PID:4500
  - - C:\Users\Admin\AppData\Local\differences\phytographic.exe
      "C:\Users\Admin\AppData\Local\differences\phytographic.exe"
      4⤵
      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:3640
    - - C:\Windows\SysWOW64\svchost.exe
        
        "C:\Users\Admin\AppData\Local\differences\phytographic.exe"
        5⤵
        Suspicious use of SetThreadContext
        System Location Discovery: System Language Discovery
        Suspicious behavior: EnumeratesProcesses
        Suspicious behavior: MapViewOfSection
        Suspicious use of WriteProcessMemory
        
        PID:4856
      - \??\c:\program files (x86)\internet explorer\iexplore.exe
        
        "c:\program files (x86)\internet explorer\iexplore.exe"
        6⤵
        
        PID:5012

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\autA99E.tmp

Filesize
401KB

MD5
9bdb56dbafef2c7ebc715f27fd09c666

SHA1
9312462afb1adf13dba9763347b6f324fa604a67

SHA256
067732f20f37d609d349215d22cbe8d3d105d8bd81b2eec0b92eb88e0be50dcc

SHA512
02a973e7741aa297046e25670f9a84b39cef311222471e25b27a87eeaf8a70ec355586934c006c62040f209213990ae9acd7f9cba61d5aaec85164415940b510

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

Filesize
483KB

MD5
dc17cc7b50713ddf429bb784945810b9

SHA1
f549ed6a69708d846837082df2d6c162ed5e6fa6

SHA256
a14743fc9a1c2244467bc51a646bfe2b5c3fc9bf23c922ef7583fc87d5f96e1e

SHA512
bc8fde0bd4bdc30977ec2a170d1f70d223a7a274fa30734e22ecabe0ab510aaa18df23e400f3ff5359d3239cb413d60ad8795613ed3a449756789c3d0fe76d29

Download Submit
C:\Users\Admin\AppData\Local\differences\phytographic.exe

Filesize
1.3MB

MD5
9fc81fa529ddcecfeb3d155f77320d62

SHA1
50c9e3d1e66afc0bccf61db4be597d0c566ead54

SHA256
1468bc256c278d1cb79771e2ab7a44f63f05ce2bc48746d6c2f069b1125593ec

SHA512
62fb3f252da77dd4357bad5bdb855218860aa66f99f83d55b02bddc25f2b3f706f684170331898fcbb976747f6f3c7dbbe227c3a9ed093ef0f5a31ef55e17b64

Download Submit
memory/216-28-0x00000000015B0000-0x00000000019B0000-memory.dmp

Filesize
4.0MB

Download
memory/1184-6-0x0000000000F70000-0x0000000001370000-memory.dmp

Filesize
4.0MB

Download
memory/4240-18-0x0000000001300000-0x0000000001700000-memory.dmp

Filesize
4.0MB

Download
memory/4856-37-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/4856-38-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/5012-41-0x0000000000450000-0x000000000045E000-memory.dmp

Filesize
56KB

Download
memory/5012-39-0x0000000000450000-0x000000000045E000-memory.dmp

Filesize
56KB

Download
memory/5012-40-0x0000000000450000-0x000000000045E000-memory.dmp

Filesize
56KB

Download

Analysis

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