remcos | f70d508424598e71e6fe5eb5bb67b24b103b6367b3e55f550f53ea313f5bc30a

General

Target

CONTRACT PDF.exe
Size

1.3MB
MD5

aea6e429dd8151e74d29dfb36a13f55f
SHA1

01d7b201aa1e353696538b85b4a034dcf4b5ab7f
SHA256

17c9fb1651af031a1e7cba7f36b7de364695ee974cfaf784b3d63346b9dc34f4
SHA512

ee332daf7a6861b5d6edd29bd16f59c2b0337a8cc611892df2df025ac8120884d95d802c9eb0bf394f21944b2679e53d5b3edd17688badb56169e12ae1ff12f0
SSDEEP

24576:AH+rre+7KSXkLs5SbzuUDY/RvaIjiuTVKTCkszir:Z/h7K4SdzBDaJaIjiqQs

Score

10^/10

remcos remotehost discovery persistence rat

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

rambolastblood.ddns.net:6327

Attributes

audio_folder
MicRecords
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
vlc.exe
copy_folder
vlc
delete_file
false
hide_file
false
hide_keylog_file
false
install_flag
true
install_path
%AppData%
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
keylog_path
%AppData%
mouse_option
false
mutex
vlc-63SQWS
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
vlc
take_screenshot_option
false
take_screenshot_time
5
take_screenshot_title
notepad;solitaire;

Signatures

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

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	WScript.exe

Executes dropped EXE 1 IoCs

pid	Process
3956	vlc.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\vlc = "\"C:\\Users\\Admin\\AppData\\Roaming\\vlc\\vlc.exe\""	RegSvcs.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 336 set thread context of 5108	336	CONTRACT PDF.exe	99

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

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	CONTRACT PDF.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RegSvcs.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vlc.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000_Classes\Local Settings	RegSvcs.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
336	CONTRACT PDF.exe
336	CONTRACT PDF.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 336 wrote to memory of 5108	336	CONTRACT PDF.exe	99
PID 336 wrote to memory of 5108	336	CONTRACT PDF.exe	99
PID 336 wrote to memory of 5108	336	CONTRACT PDF.exe	99
PID 336 wrote to memory of 5108	336	CONTRACT PDF.exe	99
PID 336 wrote to memory of 5108	336	CONTRACT PDF.exe	99
PID 336 wrote to memory of 5108	336	CONTRACT PDF.exe	99
PID 336 wrote to memory of 5108	336	CONTRACT PDF.exe	99
PID 336 wrote to memory of 5108	336	CONTRACT PDF.exe	99
PID 336 wrote to memory of 5108	336	CONTRACT PDF.exe	99
PID 336 wrote to memory of 5108	336	CONTRACT PDF.exe	99
PID 336 wrote to memory of 5108	336	CONTRACT PDF.exe	99
PID 336 wrote to memory of 5108	336	CONTRACT PDF.exe	99
PID 5108 wrote to memory of 3024	5108	RegSvcs.exe	100
PID 5108 wrote to memory of 3024	5108	RegSvcs.exe	100
PID 5108 wrote to memory of 3024	5108	RegSvcs.exe	100
PID 3024 wrote to memory of 3172	3024	WScript.exe	101
PID 3024 wrote to memory of 3172	3024	WScript.exe	101
PID 3024 wrote to memory of 3172	3024	WScript.exe	101
PID 3172 wrote to memory of 3956	3172	cmd.exe	103
PID 3172 wrote to memory of 3956	3172	cmd.exe	103
PID 3172 wrote to memory of 3956	3172	cmd.exe	103

C:\Users\Admin\AppData\Local\Temp\CONTRACT PDF.exe
"C:\Users\Admin\AppData\Local\Temp\CONTRACT PDF.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:336
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe"
  2⤵
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:5108
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
    3⤵
    - Checks computer location settings
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3024
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\vlc\vlc.exe"
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:3172
    - - C:\Users\Admin\AppData\Roaming\vlc\vlc.exe
        
        C:\Users\Admin\AppData\Roaming\vlc\vlc.exe
        5⤵
        Executes dropped EXE
        System Location Discovery: System Language Discovery
        
        PID:3956

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

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\install.vbs

Filesize
406B

MD5
f924776da3b9306135f258b408c9848b

SHA1
8d0a034351ad1d46ec0adb7ce2618e9d093f665f

SHA256
4362971fecdd25739629706e784b22e9e12b67a0dc65a70f5d8896139655a3d9

SHA512
cdaaef03ecb2728dbe964ecf04b1d70ea5a506e79ceabd1401bf3e4b4065cc478cc26bd454784d17fbee59878c63236303c0c63306170cb0cf33040a1d5f6ccb

Download Submit
C:\Users\Admin\AppData\Roaming\vlc\vlc.exe

Filesize
44KB

MD5
9d352bc46709f0cb5ec974633a0c3c94

SHA1
1969771b2f022f9a86d77ac4d4d239becdf08d07

SHA256
2c1eeb7097023c784c2bd040a2005a5070ed6f3a4abf13929377a9e39fab1390

SHA512
13c714244ec56beeb202279e4109d59c2a43c3cf29f90a374a751c04fd472b45228ca5a0178f41109ed863dbd34e0879e4a21f5e38ae3d89559c57e6be990a9b

Download Submit
memory/336-12-0x0000000007C80000-0x0000000007D1C000-memory.dmp

Filesize
624KB

Download
memory/336-9-0x0000000074410000-0x0000000074BC0000-memory.dmp

Filesize
7.7MB

Download
memory/336-4-0x0000000074410000-0x0000000074BC0000-memory.dmp

Filesize
7.7MB

Download
memory/336-5-0x0000000004C00000-0x0000000004C0A000-memory.dmp

Filesize
40KB

Download
memory/336-6-0x0000000074410000-0x0000000074BC0000-memory.dmp

Filesize
7.7MB

Download
memory/336-7-0x0000000074410000-0x0000000074BC0000-memory.dmp

Filesize
7.7MB

Download
memory/336-8-0x0000000006420000-0x0000000006430000-memory.dmp

Filesize
64KB

Download
memory/336-22-0x0000000074410000-0x0000000074BC0000-memory.dmp

Filesize
7.7MB

Download
memory/336-10-0x000000007441E000-0x000000007441F000-memory.dmp

Filesize
4KB

Download
memory/336-11-0x0000000074410000-0x0000000074BC0000-memory.dmp

Filesize
7.7MB

Download
memory/336-0-0x000000007441E000-0x000000007441F000-memory.dmp

Filesize
4KB

Download
memory/336-3-0x0000000004C40000-0x0000000004CD2000-memory.dmp

Filesize
584KB

Download
memory/336-13-0x0000000008120000-0x0000000008230000-memory.dmp

Filesize
1.1MB

Download
memory/336-1-0x00000000000B0000-0x00000000001F8000-memory.dmp

Filesize
1.3MB

Download
memory/336-14-0x0000000007D20000-0x0000000007DB0000-memory.dmp

Filesize
576KB

Download
memory/336-2-0x00000000051F0000-0x0000000005794000-memory.dmp

Filesize
5.6MB

Download
memory/3956-30-0x0000000000570000-0x000000000057E000-memory.dmp

Filesize
56KB

Download
memory/3956-31-0x00000000028A0000-0x00000000028DC000-memory.dmp

Filesize
240KB

Download
memory/3956-32-0x0000000002830000-0x0000000002851000-memory.dmp

Filesize
132KB

Download
memory/5108-21-0x0000000000400000-0x000000000047A000-memory.dmp

Filesize
488KB

Download
memory/5108-25-0x0000000000400000-0x000000000047A000-memory.dmp

Filesize
488KB

Download
memory/5108-18-0x0000000000400000-0x000000000047A000-memory.dmp

Filesize
488KB

Download
memory/5108-15-0x0000000000400000-0x000000000047A000-memory.dmp

Filesize
488KB

Download
memory/5108-16-0x0000000000400000-0x000000000047A000-memory.dmp

Filesize
488KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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