remcos | fbc7ea811a9cc4d78986918a1c07a6c6fc9f4be6e5ea4952ad76fb7b23c752af

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
06-12-2024 10:13

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General

Target

cc729b8c1f1d7f050ca51d488f2572e2_JaffaCakes118.exe
Size

224KB
MD5

cc729b8c1f1d7f050ca51d488f2572e2
SHA1

82b30570a2d787ffa79834f55e97127c2f1f08af
SHA256

fbc7ea811a9cc4d78986918a1c07a6c6fc9f4be6e5ea4952ad76fb7b23c752af
SHA512

ca09a774d0cc0225aadbba1919411c56fe52f083a62bddab07e891b9231566ea342a8fb13623afafe8141f782485d62f310506f5e07267c2a6033382ea29d5ec
SSDEEP

6144:lnOBWg8BRGHbLegPMEGSu7YG/vXYiMWt5CAVJbc15:yp8BRsbWELGo7w1VW15

Score

10^/10

remcos remotehost discovery evasion persistence rat trojan upx

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

192.168.8.104:2405

Attributes

audio_folder
MicRecords
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
svchost.exe
copy_folder
Svchost
delete_file
false
hide_file
true
hide_keylog_file
true
install_flag
true
install_path
%AppData%
keylog_crypt
true
keylog_file
logs.dat
keylog_flag
false
keylog_folder
JRE
keylog_path
%AppData%
mouse_option
false
mutex
Remcos-HYK6L3
screenshot_crypt
true
screenshot_flag
true
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
Remcos
take_screenshot_option
false
take_screenshot_time
5
take_screenshot_title
wikipedia;solitaire;

Extracted

Family

remcos

Version

3.1.1 Pro

Botnet

RemoteHost

192.168.8.104:2405

Attributes

audio_folder
MicRecords
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
svchost.exe
copy_folder
Svchost
delete_file
false
hide_file
true
hide_keylog_file
true
install_flag
true
install_path
%AppData%
keylog_crypt
true
keylog_file
logs.dat
keylog_flag
false
keylog_folder
JRE
keylog_path
%AppData%
mouse_option
false
mutex
Remcos-HYK6L3
screenshot_crypt
true
screenshot_flag
true
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
startup_value
Remcos
take_screenshot_option
false
take_screenshot_time
5
take_screenshot_title
wikipedia;solitaire;

Signatures

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

UAC bypass 3 TTPs 3 IoCs

evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	reg.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	reg.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	reg.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-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	cc729b8c1f1d7f050ca51d488f2572e2_JaffaCakes118.exe
Key value queried	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	WScript.exe

Executes dropped EXE 1 IoCs

pid	Process
3312	svchost.exe

Adds Run key to start application 2 TTPs 3 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\Svchost\\svchost.exe\""	cc729b8c1f1d7f050ca51d488f2572e2_JaffaCakes118.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\Svchost\\svchost.exe\""	svchost.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\Svchost\\svchost.exe\""	iexplore.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3312 set thread context of 3972	3312	svchost.exe	94
PID 3972 set thread context of 4224	3972	iexplore.exe	98

UPX packed file 8 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/5116-0-0x0000000001000000-0x0000000001082000-memory.dmp	upx
behavioral2/memory/5116-6-0x0000000001000000-0x0000000001082000-memory.dmp	upx
behavioral2/files/0x000a000000023cbc-9.dat	upx
behavioral2/memory/3312-10-0x0000000000D40000-0x0000000000DC2000-memory.dmp	upx
behavioral2/memory/3972-12-0x0000000000400000-0x0000000000482000-memory.dmp	upx
behavioral2/memory/3312-13-0x0000000000D40000-0x0000000000DC2000-memory.dmp	upx
behavioral2/memory/4224-15-0x0000000000400000-0x0000000000482000-memory.dmp	upx
behavioral2/memory/4224-16-0x0000000000400000-0x0000000000482000-memory.dmp	upx

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 11 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	reg.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cc729b8c1f1d7f050ca51d488f2572e2_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	iexplore.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000_Classes\Local Settings	cc729b8c1f1d7f050ca51d488f2572e2_JaffaCakes118.exe

Modifies registry key 1 TTPs 3 IoCs

Modify Registry

T1112

pid	Process
1052	reg.exe
432	reg.exe
2084	reg.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3312	svchost.exe
3312	svchost.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3972	iexplore.exe

Suspicious use of WriteProcessMemory 43 IoCs

description	pid	Process	procid_target
PID 5116 wrote to memory of 4152	5116	cc729b8c1f1d7f050ca51d488f2572e2_JaffaCakes118.exe	85
PID 5116 wrote to memory of 4152	5116	cc729b8c1f1d7f050ca51d488f2572e2_JaffaCakes118.exe	85
PID 5116 wrote to memory of 4152	5116	cc729b8c1f1d7f050ca51d488f2572e2_JaffaCakes118.exe	85
PID 4152 wrote to memory of 1052	4152	cmd.exe	87
PID 4152 wrote to memory of 1052	4152	cmd.exe	87
PID 4152 wrote to memory of 1052	4152	cmd.exe	87
PID 5116 wrote to memory of 2212	5116	cc729b8c1f1d7f050ca51d488f2572e2_JaffaCakes118.exe	88
PID 5116 wrote to memory of 2212	5116	cc729b8c1f1d7f050ca51d488f2572e2_JaffaCakes118.exe	88
PID 5116 wrote to memory of 2212	5116	cc729b8c1f1d7f050ca51d488f2572e2_JaffaCakes118.exe	88
PID 2212 wrote to memory of 1624	2212	WScript.exe	89
PID 2212 wrote to memory of 1624	2212	WScript.exe	89
PID 2212 wrote to memory of 1624	2212	WScript.exe	89
PID 1624 wrote to memory of 3312	1624	cmd.exe	91
PID 1624 wrote to memory of 3312	1624	cmd.exe	91
PID 1624 wrote to memory of 3312	1624	cmd.exe	91
PID 3312 wrote to memory of 2632	3312	svchost.exe	92
PID 3312 wrote to memory of 2632	3312	svchost.exe	92
PID 3312 wrote to memory of 2632	3312	svchost.exe	92
PID 3312 wrote to memory of 3972	3312	svchost.exe	94
PID 3312 wrote to memory of 3972	3312	svchost.exe	94
PID 3312 wrote to memory of 3972	3312	svchost.exe	94
PID 3312 wrote to memory of 3972	3312	svchost.exe	94
PID 3312 wrote to memory of 3972	3312	svchost.exe	94
PID 3312 wrote to memory of 3972	3312	svchost.exe	94
PID 3312 wrote to memory of 3972	3312	svchost.exe	94
PID 3312 wrote to memory of 3972	3312	svchost.exe	94
PID 2632 wrote to memory of 432	2632	cmd.exe	95
PID 2632 wrote to memory of 432	2632	cmd.exe	95
PID 2632 wrote to memory of 432	2632	cmd.exe	95
PID 3972 wrote to memory of 4768	3972	iexplore.exe	96
PID 3972 wrote to memory of 4768	3972	iexplore.exe	96
PID 3972 wrote to memory of 4768	3972	iexplore.exe	96
PID 3972 wrote to memory of 4224	3972	iexplore.exe	98
PID 3972 wrote to memory of 4224	3972	iexplore.exe	98
PID 3972 wrote to memory of 4224	3972	iexplore.exe	98
PID 3972 wrote to memory of 4224	3972	iexplore.exe	98
PID 3972 wrote to memory of 4224	3972	iexplore.exe	98
PID 3972 wrote to memory of 4224	3972	iexplore.exe	98
PID 3972 wrote to memory of 4224	3972	iexplore.exe	98
PID 3972 wrote to memory of 4224	3972	iexplore.exe	98
PID 4768 wrote to memory of 2084	4768	cmd.exe	99
PID 4768 wrote to memory of 2084	4768	cmd.exe	99
PID 4768 wrote to memory of 2084	4768	cmd.exe	99

C:\Users\Admin\AppData\Local\Temp\cc729b8c1f1d7f050ca51d488f2572e2_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\cc729b8c1f1d7f050ca51d488f2572e2_JaffaCakes118.exe"
1⤵
- Checks computer location settings
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:5116
- C:\Windows\SysWOW64\cmd.exe
  /k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4152
- - C:\Windows\SysWOW64\reg.exe
    C:\Windows\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
    3⤵
    - UAC bypass
    - System Location Discovery: System Language Discovery
    - Modifies registry key
    PID:1052
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2212
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\Svchost\svchost.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:1624
  - - C:\Users\Admin\AppData\Roaming\Svchost\svchost.exe
      C:\Users\Admin\AppData\Roaming\Svchost\svchost.exe
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Suspicious use of SetThreadContext
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of WriteProcessMemory
      PID:3312
    - - C:\Windows\SysWOW64\cmd.exe
        
        /k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
        5⤵
        System Location Discovery: System Language Discovery
        Suspicious use of WriteProcessMemory
        
        PID:2632
      - C:\Windows\SysWOW64\reg.exe
        
        C:\Windows\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
        6⤵
        UAC bypass
        System Location Discovery: System Language Discovery
        Modifies registry key
        
        PID:432
    - - C:\Program Files (x86)\Internet Explorer\iexplore.exe
        
        "C:\Program Files (x86)\Internet Explorer\iexplore.exe"
        5⤵
        Adds Run key to start application
        Suspicious use of SetThreadContext
        System Location Discovery: System Language Discovery
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:3972
      - C:\Windows\SysWOW64\cmd.exe
        
        /k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
        6⤵
        System Location Discovery: System Language Discovery
        Suspicious use of WriteProcessMemory
        
        PID:4768
        
        C:\Windows\SysWOW64\reg.exe
        
        C:\Windows\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
        7⤵
        UAC bypass
        System Location Discovery: System Language Discovery
        Modifies registry key
        
        PID:2084
      - C:\Windows\SysWOW64\svchost.exe
        
        C:\Windows\SysWOW64\svchost.exe
        6⤵
        
        PID:4224

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

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

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
422B

MD5
28f7c9f293bd54fc800cabccfc9361af

SHA1
6361ba75e4d8cbf849313bd0c56ba5579e372ba9

SHA256
5250e980a12f9105709a9584f460bfdc7f1446d4bcb4f26f8f649367ef467799

SHA512
08c646ffad1c517e01a1076ba5ee827a6e2d16a20c8bc8f47d06eda05ba5962cf177aea1f8238f4bd841df22773072e0099d8f2dbc6bd708259d18fdbf9e3cd9

Download Submit
C:\Users\Admin\AppData\Roaming\Svchost\svchost.exe

Filesize
224KB

MD5
cc729b8c1f1d7f050ca51d488f2572e2

SHA1
82b30570a2d787ffa79834f55e97127c2f1f08af

SHA256
fbc7ea811a9cc4d78986918a1c07a6c6fc9f4be6e5ea4952ad76fb7b23c752af

SHA512
ca09a774d0cc0225aadbba1919411c56fe52f083a62bddab07e891b9231566ea342a8fb13623afafe8141f782485d62f310506f5e07267c2a6033382ea29d5ec

Download Submit
memory/3312-10-0x0000000000D40000-0x0000000000DC2000-memory.dmp

Filesize
520KB

Download
memory/3312-13-0x0000000000D40000-0x0000000000DC2000-memory.dmp

Filesize
520KB

Download
memory/3972-12-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/4224-15-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/4224-16-0x0000000000400000-0x0000000000482000-memory.dmp

Filesize
520KB

Download
memory/5116-0-0x0000000001000000-0x0000000001082000-memory.dmp

Filesize
520KB

Download
memory/5116-6-0x0000000001000000-0x0000000001082000-memory.dmp

Filesize
520KB

Download