remcos | 9ab651c11036df65785bcd01fe6ecb68a9b0beb56579b76c350dbd3f6960f0ae

Analysis

max time kernel
146s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
19/05/2024, 23:16

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General

Target
5bfc4a0b0e7484ff63f2eb66b45186b7_JaffaCakes118.exe
Size 624KB
Sample240519-287f8agc92
SHA256 9ab651c11036df65785bcd01fe6ecb68a9b0beb56579b76c350dbd3f6960f0ae
MD5 5bfc4a0b0e7484ff63f2eb66b45186b7
SHA1 804f350c5034fc13fcc3d49e72de98799e301fb2
SHA512 084dcda591290c89d1fec84c7868d65522d193524cbbc15d61bec710f617535bf77386ea5a6c3c1b366cce216dd7310d84271847775497533648d04b8ae00620
SSDEEP 6144:Fp7rCb1Ekm7tzWFMLP1Coq4nFNDsFWhMh0Q/AISm9rY1NOC8IBfmbhscwovdC5OB:FJrCZW9WGLP1MWaym3C8qmbyo05OcEl
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

remcos microsoftdll persistence rat

Malware Config

Extracted

Family

remcos

Version

1.8.1 Pro

Botnet

MicrosoftDll

1.habladourf.top:24043

Attributes

audio_folder
audio
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
5
copy_file
crrcs.exe
copy_folder
Microsoft
delete_file
false
hide_file
true
hide_keylog_file
true
install_flag
true
install_path
%WinDir%\System32
keylog_crypt
true
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
keylog_path
%AppData%
mouse_option
false
mutex
ERDATYFVUASG_AGSJHDJDJG-GR2269
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
1
startup_value
crrcs.exe
take_screenshot_option
false
take_screenshot_time
5

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat 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-1-5-21-1181767204-2009306918-3718769404-1000\Control Panel\International\Geo\Nation	5bfc4a0b0e7484ff63f2eb66b45186b7_JaffaCakes118.exe

Executes dropped EXE 1 IoCs

pid	Process
4164	crrcs.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\crrcs.exe = "\"C:\\Windows\\SysWOW64\\Microsoft\\crrcs.exe\""	crrcs.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\crrcs.exe = "\"C:\\Windows\\SysWOW64\\Microsoft\\crrcs.exe\""	5bfc4a0b0e7484ff63f2eb66b45186b7_JaffaCakes118.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\crrcs.exe = "\"C:\\Windows\\SysWOW64\\Microsoft\\crrcs.exe\""	5bfc4a0b0e7484ff63f2eb66b45186b7_JaffaCakes118.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\crrcs.exe = "\"C:\\Windows\\SysWOW64\\Microsoft\\crrcs.exe\""	crrcs.exe

Drops file in System32 directory 3 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\Microsoft\crrcs.exe	5bfc4a0b0e7484ff63f2eb66b45186b7_JaffaCakes118.exe
File opened for modification	C:\Windows\SysWOW64\Microsoft	5bfc4a0b0e7484ff63f2eb66b45186b7_JaffaCakes118.exe
File created	C:\Windows\SysWOW64\Microsoft\crrcs.exe	5bfc4a0b0e7484ff63f2eb66b45186b7_JaffaCakes118.exe

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

System Information Discovery
T1082

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2244	PING.EXE

Suspicious behavior: EnumeratesProcesses 28 IoCs

pid	Process
5100	5bfc4a0b0e7484ff63f2eb66b45186b7_JaffaCakes118.exe
5100	5bfc4a0b0e7484ff63f2eb66b45186b7_JaffaCakes118.exe
5100	5bfc4a0b0e7484ff63f2eb66b45186b7_JaffaCakes118.exe
5100	5bfc4a0b0e7484ff63f2eb66b45186b7_JaffaCakes118.exe
5100	5bfc4a0b0e7484ff63f2eb66b45186b7_JaffaCakes118.exe
5100	5bfc4a0b0e7484ff63f2eb66b45186b7_JaffaCakes118.exe
5100	5bfc4a0b0e7484ff63f2eb66b45186b7_JaffaCakes118.exe
5100	5bfc4a0b0e7484ff63f2eb66b45186b7_JaffaCakes118.exe
5100	5bfc4a0b0e7484ff63f2eb66b45186b7_JaffaCakes118.exe
5100	5bfc4a0b0e7484ff63f2eb66b45186b7_JaffaCakes118.exe
5100	5bfc4a0b0e7484ff63f2eb66b45186b7_JaffaCakes118.exe
5100	5bfc4a0b0e7484ff63f2eb66b45186b7_JaffaCakes118.exe
5100	5bfc4a0b0e7484ff63f2eb66b45186b7_JaffaCakes118.exe
5100	5bfc4a0b0e7484ff63f2eb66b45186b7_JaffaCakes118.exe
4164	crrcs.exe
4164	crrcs.exe
4164	crrcs.exe
4164	crrcs.exe
4164	crrcs.exe
4164	crrcs.exe
4164	crrcs.exe
4164	crrcs.exe
4164	crrcs.exe
4164	crrcs.exe
4164	crrcs.exe
4164	crrcs.exe
4164	crrcs.exe
4164	crrcs.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4164	crrcs.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 5100 wrote to memory of 4948	5100	5bfc4a0b0e7484ff63f2eb66b45186b7_JaffaCakes118.exe	101
PID 5100 wrote to memory of 4948	5100	5bfc4a0b0e7484ff63f2eb66b45186b7_JaffaCakes118.exe	101
PID 5100 wrote to memory of 4948	5100	5bfc4a0b0e7484ff63f2eb66b45186b7_JaffaCakes118.exe	101
PID 4948 wrote to memory of 2244	4948	cmd.exe	103
PID 4948 wrote to memory of 2244	4948	cmd.exe	103
PID 4948 wrote to memory of 2244	4948	cmd.exe	103
PID 4948 wrote to memory of 4164	4948	cmd.exe	104
PID 4948 wrote to memory of 4164	4948	cmd.exe	104
PID 4948 wrote to memory of 4164	4948	cmd.exe	104

C:\Users\Admin\AppData\Local\Temp\5bfc4a0b0e7484ff63f2eb66b45186b7_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\5bfc4a0b0e7484ff63f2eb66b45186b7_JaffaCakes118.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- Drops file in System32 directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:5100
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\install.bat" "
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4948
- - C:\Windows\SysWOW64\PING.EXE
    PING 127.0.0.1 -n 2
    3⤵
    - Runs ping.exe
    PID:2244
- - C:\Windows\SysWOW64\Microsoft\crrcs.exe
    "C:\Windows\SysWOW64\Microsoft\crrcs.exe"
    3⤵
    - Executes dropped EXE
    - Adds Run key to start application
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of SetWindowsHookEx
    PID:4164

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --field-trial-handle=4256,i,13640054265074968359,8146127767143474550,262144 --variations-seed-version --mojo-platform-channel-handle=3924 /prefetch:8
1⤵
PID:1596

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

install.bat

Path C:\Users\Admin\AppData\Local\Temp\install.bat
Size 90B
SHA256 2f9c8881dd083f02446f616ce3fbbcb008bb92b21cfd5dc85652a38d297eebf5
MD5 163f2af0d421cff56e30d04e89363fe7
SHA1 5116aa1cad828ecd3e0819c15523839901fa6eac
SHA512 303ca46c8319393f7257088328da0bcd4b5a66de64fb15fd0e306dccf4985d8179d73c346d44c574807436aedd7da8cabb0c24494876fb5c151dd62d174bc8fb
MD5 SHA1 SHA512

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crrcs.exe

Path C:\Windows\SysWOW64\Microsoft\crrcs.exe
Size 624KB
SHA256 9ab651c11036df65785bcd01fe6ecb68a9b0beb56579b76c350dbd3f6960f0ae
MD5 5bfc4a0b0e7484ff63f2eb66b45186b7
SHA1 804f350c5034fc13fcc3d49e72de98799e301fb2
SHA512 084dcda591290c89d1fec84c7868d65522d193524cbbc15d61bec710f617535bf77386ea5a6c3c1b366cce216dd7310d84271847775497533648d04b8ae00620
SSDEEP 6144:Fp7rCb1Ekm7tzWFMLP1Coq4nFNDsFWhMh0Q/AISm9rY1NOC8IBfmbhscwovdC5OB:FJrCZW9WGLP1MWaym3C8qmbyo05OcEl
MD5 SHA1 SHA512 SSDEEP

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memory/4164-21-0x0000000000400000-0x000000000049C000-memory.dmp

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memory/4164-17-0x0000000000400000-0x000000000049C000-memory.dmp

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memory/4164-33-0x0000000000400000-0x000000000049C000-memory.dmp

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memory/4164-32-0x0000000000400000-0x000000000049C000-memory.dmp

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memory/4164-31-0x0000000000400000-0x000000000049C000-memory.dmp

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memory/4164-30-0x0000000000400000-0x000000000049C000-memory.dmp

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memory/4164-15-0x0000000000400000-0x000000000049C000-memory.dmp

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memory/4164-23-0x0000000000400000-0x000000000049C000-memory.dmp

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memory/4164-22-0x0000000000400000-0x000000000049C000-memory.dmp

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memory/4164-20-0x0000000000400000-0x000000000049C000-memory.dmp

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memory/4164-29-0x0000000000400000-0x000000000049C000-memory.dmp

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memory/4164-28-0x0000000000400000-0x000000000049C000-memory.dmp

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memory/4164-16-0x0000000000400000-0x000000000049C000-memory.dmp

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memory/4164-24-0x0000000000400000-0x000000000049C000-memory.dmp

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memory/4164-25-0x0000000000400000-0x000000000049C000-memory.dmp

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memory/4164-26-0x0000000000400000-0x000000000049C000-memory.dmp

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memory/4164-27-0x0000000000400000-0x000000000049C000-memory.dmp

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memory/5100-0-0x0000000000570000-0x00000000005EB000-memory.dmp

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memory/5100-8-0x0000000000400000-0x000000000049C000-memory.dmp

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memory/5100-1-0x0000000076F42000-0x0000000076F43000-memory.dmp

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memory/5100-2-0x0000000000401000-0x000000000041A000-memory.dmp

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memory/5100-9-0x0000000000570000-0x00000000005EB000-memory.dmp

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memory/5100-10-0x0000000000401000-0x000000000041A000-memory.dmp

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