remcos | 88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12

Analysis

max time kernel
150s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
26/12/2024, 22:13 UTC

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General

Target

JaffaCakes118_88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12.exe
Size

124KB
MD5

8b62975c6ddaa41bae24ce12cede46c5
SHA1

fb182a7d0975fe1509ff69caa0f21a2574bb6258
SHA256

88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12
SHA512

e980d7784fac9a5d16ee84930cbc12aa524d774c2bbcd11e2ede8fa5a52232cc98652df842e770c585bc225401c52512e34c1482a8437357e6e224391db5d1ac
SSDEEP

3072:mlh1qaSs6IF9OK4b80S2Van4Va1cpcQjed5OzqhUra:Ch1qn3IF9Obbj/a1cpcQjeHOzqhUr

Score

10^/10

remcos remotehost discovery persistence rat

Malware Config

Extracted

Family

remcos

Version

2.5.0 Pro

Botnet

RemoteHost

91.193.75.145:1604

Attributes

audio_folder
MicRecords
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
firefox1.exe
copy_folder
firefox
delete_file
true
hide_file
false
hide_keylog_file
false
install_flag
true
install_path
%AppData%
keylog_crypt
false
keylog_file
logs9.dat
keylog_flag
false
keylog_folder
remcos
keylog_path
%AppData%
mouse_option
false
mutex
Remcos-IVNP1E
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
firefox
take_screenshot_option
false
take_screenshot_time
5
take_screenshot_title
wikipedia;solitaire;

Signatures

Modifies WinLogon for persistence 2 TTPs 2 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\WINDOWS\\system32\\userinit.exe, \"C:\\Users\\Admin\\AppData\\Roaming\\firefox\\firefox1.exe\""	JaffaCakes118_88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\WINDOWS\\system32\\userinit.exe, \"C:\\Users\\Admin\\AppData\\Roaming\\firefox\\firefox1.exe\""	firefox1.exe

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

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-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	JaffaCakes118_88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	WScript.exe

Deletes itself 1 IoCs

pid	Process
2332	WScript.exe

Executes dropped EXE 1 IoCs

pid	Process
1592	firefox1.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\firefox = "\"C:\\Users\\Admin\\AppData\\Roaming\\firefox\\firefox1.exe\""	JaffaCakes118_88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\firefox = "\"C:\\Users\\Admin\\AppData\\Roaming\\firefox\\firefox1.exe\""	firefox1.exe

Modifies WinLogon 2 TTPs 2 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	JaffaCakes118_88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	firefox1.exe

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 4 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	JaffaCakes118_88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12.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	firefox1.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000_Classes\Local Settings	JaffaCakes118_88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1592	firefox1.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 3532 wrote to memory of 2332	3532	JaffaCakes118_88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12.exe	83
PID 3532 wrote to memory of 2332	3532	JaffaCakes118_88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12.exe	83
PID 3532 wrote to memory of 2332	3532	JaffaCakes118_88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12.exe	83
PID 2332 wrote to memory of 3804	2332	WScript.exe	84
PID 2332 wrote to memory of 3804	2332	WScript.exe	84
PID 2332 wrote to memory of 3804	2332	WScript.exe	84
PID 3804 wrote to memory of 1592	3804	cmd.exe	86
PID 3804 wrote to memory of 1592	3804	cmd.exe	86
PID 3804 wrote to memory of 1592	3804	cmd.exe	86

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12.exe"
1⤵
- Modifies WinLogon for persistence
- Checks computer location settings
- Adds Run key to start application
- Modifies WinLogon
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:3532
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
  2⤵
  - Checks computer location settings
  - Deletes itself
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2332
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\firefox\firefox1.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3804
  - - C:\Users\Admin\AppData\Roaming\firefox\firefox1.exe
      C:\Users\Admin\AppData\Roaming\firefox\firefox1.exe
      4⤵
      Modifies WinLogon for persistence
      Executes dropped EXE
      Adds Run key to start application
      Modifies WinLogon
      System Location Discovery: System Language Discovery
      Suspicious use of SetWindowsHookEx
      PID:1592

Network

DNS

8.8.8.8.in-addr.arpa

Remote address:

8.8.8.8:53

Request

8.8.8.8.in-addr.arpa

IN PTR

Response

8.8.8.8.in-addr.arpa

IN PTR

dnsgoogle
DNS

58.55.71.13.in-addr.arpa

Remote address:

8.8.8.8:53

Request

58.55.71.13.in-addr.arpa

IN PTR

Response
DNS

172.210.232.199.in-addr.arpa

Remote address:

8.8.8.8:53

Request

172.210.232.199.in-addr.arpa

IN PTR

Response
DNS

75.159.190.20.in-addr.arpa

Remote address:

8.8.8.8:53

Request

75.159.190.20.in-addr.arpa

IN PTR

Response
DNS

95.221.229.192.in-addr.arpa

Remote address:

8.8.8.8:53

Request

95.221.229.192.in-addr.arpa

IN PTR

Response
DNS

104.219.191.52.in-addr.arpa

Remote address:

8.8.8.8:53

Request

104.219.191.52.in-addr.arpa

IN PTR

Response
DNS

53.210.109.20.in-addr.arpa

Remote address:

8.8.8.8:53

Request

53.210.109.20.in-addr.arpa

IN PTR

Response
DNS

206.23.85.13.in-addr.arpa

Remote address:

8.8.8.8:53

Request

206.23.85.13.in-addr.arpa

IN PTR

Response
DNS

19.229.111.52.in-addr.arpa

Remote address:

8.8.8.8:53

Request

19.229.111.52.in-addr.arpa

IN PTR

Response

91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

260 B
200 B
5
5
91.193.75.145:1604

firefox1.exe

52 B
1

8.8.8.8:53

8.8.8.8.in-addr.arpa

dns

66 B
90 B
1
1

DNS Request

8.8.8.8.in-addr.arpa
8.8.8.8:53

58.55.71.13.in-addr.arpa

dns

70 B
144 B
1
1

DNS Request

58.55.71.13.in-addr.arpa
8.8.8.8:53

172.210.232.199.in-addr.arpa

dns

74 B
128 B
1
1

DNS Request

172.210.232.199.in-addr.arpa
8.8.8.8:53

75.159.190.20.in-addr.arpa

dns

72 B
158 B
1
1

DNS Request

75.159.190.20.in-addr.arpa
8.8.8.8:53

95.221.229.192.in-addr.arpa

dns

73 B
144 B
1
1

DNS Request

95.221.229.192.in-addr.arpa
8.8.8.8:53

104.219.191.52.in-addr.arpa

dns

73 B
147 B
1
1

DNS Request

104.219.191.52.in-addr.arpa
8.8.8.8:53

53.210.109.20.in-addr.arpa

dns

72 B
158 B
1
1

DNS Request

53.210.109.20.in-addr.arpa
8.8.8.8:53

206.23.85.13.in-addr.arpa

dns

71 B
145 B
1
1

DNS Request

206.23.85.13.in-addr.arpa
8.8.8.8:53

19.229.111.52.in-addr.arpa

dns

72 B
158 B
1
1

DNS Request

19.229.111.52.in-addr.arpa
8.8.8.8:53

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

Winlogon Helper DLL

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
692B

MD5
a86b6d7e80c9b3568ea72832ff512e8a

SHA1
9956983e499222955b86255747034251f4e63ed5

SHA256
1bce219a4bfa0ba3a2564a8e0b0dd3a176429d3f536119e2aa8264a2365925b8

SHA512
99a445ec335844ccc0d2c2a47d56f6bc4c7b2e0368adff62c34233f08e31e881726f1e4c300b4e7c4cde9a3ba81e1cf9f973c580a1b0f9beae5af00fa3e0e1e5

Download Submit
C:\Users\Admin\AppData\Roaming\firefox\firefox1.exe

Filesize
124KB

MD5
8b62975c6ddaa41bae24ce12cede46c5

SHA1
fb182a7d0975fe1509ff69caa0f21a2574bb6258

SHA256
88b5e8bf2561c9e5843c182357079e8f65a51f0de66f11e2e8f489789f822d12

SHA512
e980d7784fac9a5d16ee84930cbc12aa524d774c2bbcd11e2ede8fa5a52232cc98652df842e770c585bc225401c52512e34c1482a8437357e6e224391db5d1ac

Download Submit
C:\Users\Admin\AppData\Roaming\remcos\logs9.dat

Filesize
74B

MD5
d1d6c6069c471f5ff2df97d866023786

SHA1
a0f87526a3c024c15f21ffdc83393ac12fe06bd9

SHA256
4eec30926df6eab97aa1e37bd0d26c2bab5c592cbd3e157a4cae60db60c27326

SHA512
5adb7deadbc0570274a0cba8497519ff3550b280c7cc95640f0e56893389e30851afe0ae53dbb61be8701eb6c1667d479b71c4cfc645f667f0c6949ec940bb50

Download Submit

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

DNS Request

DNS Request

DNS Request

DNS Request

DNS Request

DNS Request

DNS Request

DNS Request

DNS Request

MITRE ATT&CK Enterprise v15

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