remcos | ce34362e7d74de7ef421e07b354db41c35a11d1c7c5e3372ac03df2283caf9f9

General

Target

ce34362e7d74de7ef421e07b354db41c35a11d1c7c5e3372ac03df2283caf9f9.exe
Size

471KB
MD5

f4dfa2a79474f83952fb06cbefc3147a
SHA1

201d5b03e66a4f43b757bb685ba60665c258b078
SHA256

ce34362e7d74de7ef421e07b354db41c35a11d1c7c5e3372ac03df2283caf9f9
SHA512

211981b2e4840eaa3c1d72ad46e08adbf147ad3700dfdd9fbef1eefbc8249a4a1c36ecdceeace913dd8abf0a27abfed2449f0e11c7df1ad280b2a26f85d6af46
SSDEEP

6144:3LKPIsBiPVYkvO5OLRMIOeMqwCObQQkEf90gF8gHsAOZZZ1XzccXCm4:3LKP3QYkvOI9fOeVwCOcQvZsfZZ94

Score

10^/10

remcos worldclass persistence rat

Malware Config

Extracted

Family

remcos

Botnet

worldclass

C2

91.193.75.188:60005

Attributes

audio_folder
MicRecords
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
worldclass.exe
copy_folder
worldclass
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
mouse_option
false
mutex
Rmc-UPD1GY
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
worldclass
take_screenshot_option
false
take_screenshot_time
5

Signatures

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

Executes dropped EXE 1 IoCs

pid	Process
2220	worldclass.exe

Checks computer location settings 2 TTPs 2 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-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	ce34362e7d74de7ef421e07b354db41c35a11d1c7c5e3372ac03df2283caf9f9.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	WScript.exe

Adds Run key to start application 2 TTPs 8 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\worldclass = "\"C:\\Users\\Admin\\AppData\\Roaming\\worldclass\\worldclass.exe\""	ce34362e7d74de7ef421e07b354db41c35a11d1c7c5e3372ac03df2283caf9f9.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\	ce34362e7d74de7ef421e07b354db41c35a11d1c7c5e3372ac03df2283caf9f9.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\worldclass = "\"C:\\Users\\Admin\\AppData\\Roaming\\worldclass\\worldclass.exe\""	ce34362e7d74de7ef421e07b354db41c35a11d1c7c5e3372ac03df2283caf9f9.exe
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Windows\CurrentVersion\Run\	worldclass.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\worldclass = "\"C:\\Users\\Admin\\AppData\\Roaming\\worldclass\\worldclass.exe\""	worldclass.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\	worldclass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\worldclass = "\"C:\\Users\\Admin\\AppData\\Roaming\\worldclass\\worldclass.exe\""	worldclass.exe
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Software\Microsoft\Windows\CurrentVersion\Run\	ce34362e7d74de7ef421e07b354db41c35a11d1c7c5e3372ac03df2283caf9f9.exe

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

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000_Classes\Local Settings	ce34362e7d74de7ef421e07b354db41c35a11d1c7c5e3372ac03df2283caf9f9.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2220	worldclass.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 4772 wrote to memory of 4988	4772	ce34362e7d74de7ef421e07b354db41c35a11d1c7c5e3372ac03df2283caf9f9.exe	81
PID 4772 wrote to memory of 4988	4772	ce34362e7d74de7ef421e07b354db41c35a11d1c7c5e3372ac03df2283caf9f9.exe	81
PID 4772 wrote to memory of 4988	4772	ce34362e7d74de7ef421e07b354db41c35a11d1c7c5e3372ac03df2283caf9f9.exe	81
PID 4988 wrote to memory of 4636	4988	WScript.exe	82
PID 4988 wrote to memory of 4636	4988	WScript.exe	82
PID 4988 wrote to memory of 4636	4988	WScript.exe	82
PID 4636 wrote to memory of 2220	4636	cmd.exe	84
PID 4636 wrote to memory of 2220	4636	cmd.exe	84
PID 4636 wrote to memory of 2220	4636	cmd.exe	84

C:\Users\Admin\AppData\Local\Temp\ce34362e7d74de7ef421e07b354db41c35a11d1c7c5e3372ac03df2283caf9f9.exe
"C:\Users\Admin\AppData\Local\Temp\ce34362e7d74de7ef421e07b354db41c35a11d1c7c5e3372ac03df2283caf9f9.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4772
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\clquwqfuuojdouzgxj.vbs"
  2⤵
  - Checks computer location settings
  - Suspicious use of WriteProcessMemory
  PID:4988
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\worldclass\worldclass.exe"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4636
  - - C:\Users\Admin\AppData\Roaming\worldclass\worldclass.exe
      C:\Users\Admin\AppData\Roaming\worldclass\worldclass.exe
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Suspicious use of SetWindowsHookEx
      PID:2220

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\clquwqfuuojdouzgxj.vbs

Filesize
434B

MD5
a4a28eb230fc2e09b69530a935514936

SHA1
094116e18776a84014e76cfe46e0b21de5245fbe

SHA256
0e5fb1081178e158c0eeebc64c04edfd5692ced5fda83b963f7997c33c40e198

SHA512
365e872a428c0bd15bece5bd1014beeb4618cce6ea572df1c9100ba8a6048ed5dfc6be5ec7999272082097830bf8703312f267dc2a92bc7e4d8b63a72e27cf5f

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

Filesize
471KB

MD5
f4dfa2a79474f83952fb06cbefc3147a

SHA1
201d5b03e66a4f43b757bb685ba60665c258b078

SHA256
ce34362e7d74de7ef421e07b354db41c35a11d1c7c5e3372ac03df2283caf9f9

SHA512
211981b2e4840eaa3c1d72ad46e08adbf147ad3700dfdd9fbef1eefbc8249a4a1c36ecdceeace913dd8abf0a27abfed2449f0e11c7df1ad280b2a26f85d6af46

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

Filesize
471KB

MD5
f4dfa2a79474f83952fb06cbefc3147a

SHA1
201d5b03e66a4f43b757bb685ba60665c258b078

SHA256
ce34362e7d74de7ef421e07b354db41c35a11d1c7c5e3372ac03df2283caf9f9

SHA512
211981b2e4840eaa3c1d72ad46e08adbf147ad3700dfdd9fbef1eefbc8249a4a1c36ecdceeace913dd8abf0a27abfed2449f0e11c7df1ad280b2a26f85d6af46

Download Submit

Analysis

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