asyncrat | 57808e8e73a208f17c7dac4f72f70f28246702da963b1a4c81d660644fea15dc

Analysis

max time kernel
137s
max time network
145s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
25-12-2024 21:26

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

cfb4e7b08343010cf746149e718c8737e4293390d02bc5bf30d46c5e73871651.exe
Size

471KB
MD5

c3564bf107406c43b36f5e9e4c5af650
SHA1

c27ea516aed7e051fcd206ad3606bd8574cfecb7
SHA256

cfb4e7b08343010cf746149e718c8737e4293390d02bc5bf30d46c5e73871651
SHA512

72ee051b13015543881e9a481938b32af3634d67d7842dd42a882f2e2327d3b3fccfa5d18c5263ef43400c8798cbd4b759eb496d7ee5b641ca05e3eb3d1340a6
SSDEEP

6144:+rFicDmVT0o7MqCH4z7492xGyxLoYRzFH8XKKEqQZWIY2FxHCum96oxVnNr9zpCo:+rFz/q7PmyxL7tF4z+xY2if96oxVnF

Score

10^/10

asyncrat remcos default host discovery persistence rat

Malware Config

Extracted

Family

remcos

Version

1.7 Pro

Botnet

Host

194.5.98.81:7123

Attributes

audio_folder
audio
audio_path
%AppData%
audio_record_time
5
connect_delay
0
connect_interval
5
copy_file
mstsc.exe
copy_folder
remcos
delete_file
false
hide_file
true
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
remcos_lfqwkauxufogluh
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screens
screenshot_path
%AppData%
screenshot_time
1
startup_value
remcos
take_screenshot_option
false
take_screenshot_time
5

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

127.0.0.1:2510

194.5.98.81:2510

Mutex

AsyncMutex_6SI8OkPnk

Attributes

delay
20
install
true
install_file
svchost.exe
install_folder
%AppData%

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat
Asyncrat family
asyncrat
Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
Remcos family
remcos

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral2/files/0x0008000000023ccc-23.dat	family_asyncrat

Checks computer location settings 2 TTPs 3 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-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	cfb4e7b08343010cf746149e718c8737e4293390d02bc5bf30d46c5e73871651.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	BB.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	Ab.exe

Executes dropped EXE 4 IoCs

pid	Process
2912	Ab.exe
3984	BB.exe
4844	mstsc.exe
4428	svchost.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-1-5-21-3756129449-3121373848-4276368241-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\mstsc.exe\""	BB.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\remcos\\mstsc.exe\""	mstsc.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3824 set thread context of 4756	3824	cfb4e7b08343010cf746149e718c8737e4293390d02bc5bf30d46c5e73871651.exe	91

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 12 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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	BB.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mstsc.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	cfb4e7b08343010cf746149e718c8737e4293390d02bc5bf30d46c5e73871651.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cfb4e7b08343010cf746149e718c8737e4293390d02bc5bf30d46c5e73871651.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Ab.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
1688	PING.EXE

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1056	timeout.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1688	PING.EXE

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
2276	schtasks.exe

Suspicious behavior: EnumeratesProcesses 22 IoCs

pid	Process
3824	cfb4e7b08343010cf746149e718c8737e4293390d02bc5bf30d46c5e73871651.exe
2912	Ab.exe
2912	Ab.exe
2912	Ab.exe
2912	Ab.exe
2912	Ab.exe
2912	Ab.exe
2912	Ab.exe
2912	Ab.exe
2912	Ab.exe
2912	Ab.exe
2912	Ab.exe
2912	Ab.exe
2912	Ab.exe
2912	Ab.exe
2912	Ab.exe
2912	Ab.exe
2912	Ab.exe
2912	Ab.exe
2912	Ab.exe
2912	Ab.exe
2912	Ab.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	3824	cfb4e7b08343010cf746149e718c8737e4293390d02bc5bf30d46c5e73871651.exe
Token: SeDebugPrivilege	2912	Ab.exe
Token: SeDebugPrivilege	4428	svchost.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4756	cfb4e7b08343010cf746149e718c8737e4293390d02bc5bf30d46c5e73871651.exe
4844	mstsc.exe

Suspicious use of WriteProcessMemory 37 IoCs

description	pid	Process	procid_target
PID 3824 wrote to memory of 4756	3824	cfb4e7b08343010cf746149e718c8737e4293390d02bc5bf30d46c5e73871651.exe	91
PID 3824 wrote to memory of 4756	3824	cfb4e7b08343010cf746149e718c8737e4293390d02bc5bf30d46c5e73871651.exe	91
PID 3824 wrote to memory of 4756	3824	cfb4e7b08343010cf746149e718c8737e4293390d02bc5bf30d46c5e73871651.exe	91
PID 3824 wrote to memory of 4756	3824	cfb4e7b08343010cf746149e718c8737e4293390d02bc5bf30d46c5e73871651.exe	91
PID 3824 wrote to memory of 4756	3824	cfb4e7b08343010cf746149e718c8737e4293390d02bc5bf30d46c5e73871651.exe	91
PID 3824 wrote to memory of 4756	3824	cfb4e7b08343010cf746149e718c8737e4293390d02bc5bf30d46c5e73871651.exe	91
PID 3824 wrote to memory of 4756	3824	cfb4e7b08343010cf746149e718c8737e4293390d02bc5bf30d46c5e73871651.exe	91
PID 4756 wrote to memory of 2912	4756	cfb4e7b08343010cf746149e718c8737e4293390d02bc5bf30d46c5e73871651.exe	92
PID 4756 wrote to memory of 2912	4756	cfb4e7b08343010cf746149e718c8737e4293390d02bc5bf30d46c5e73871651.exe	92
PID 4756 wrote to memory of 2912	4756	cfb4e7b08343010cf746149e718c8737e4293390d02bc5bf30d46c5e73871651.exe	92
PID 4756 wrote to memory of 3984	4756	cfb4e7b08343010cf746149e718c8737e4293390d02bc5bf30d46c5e73871651.exe	93
PID 4756 wrote to memory of 3984	4756	cfb4e7b08343010cf746149e718c8737e4293390d02bc5bf30d46c5e73871651.exe	93
PID 4756 wrote to memory of 3984	4756	cfb4e7b08343010cf746149e718c8737e4293390d02bc5bf30d46c5e73871651.exe	93
PID 3984 wrote to memory of 4120	3984	BB.exe	94
PID 3984 wrote to memory of 4120	3984	BB.exe	94
PID 3984 wrote to memory of 4120	3984	BB.exe	94
PID 4120 wrote to memory of 1688	4120	cmd.exe	96
PID 4120 wrote to memory of 1688	4120	cmd.exe	96
PID 4120 wrote to memory of 1688	4120	cmd.exe	96
PID 4120 wrote to memory of 4844	4120	cmd.exe	97
PID 4120 wrote to memory of 4844	4120	cmd.exe	97
PID 4120 wrote to memory of 4844	4120	cmd.exe	97
PID 2912 wrote to memory of 4112	2912	Ab.exe	98
PID 2912 wrote to memory of 4112	2912	Ab.exe	98
PID 2912 wrote to memory of 4112	2912	Ab.exe	98
PID 2912 wrote to memory of 2308	2912	Ab.exe	100
PID 2912 wrote to memory of 2308	2912	Ab.exe	100
PID 2912 wrote to memory of 2308	2912	Ab.exe	100
PID 2308 wrote to memory of 1056	2308	cmd.exe	102
PID 2308 wrote to memory of 1056	2308	cmd.exe	102
PID 2308 wrote to memory of 1056	2308	cmd.exe	102
PID 4112 wrote to memory of 2276	4112	cmd.exe	103
PID 4112 wrote to memory of 2276	4112	cmd.exe	103
PID 4112 wrote to memory of 2276	4112	cmd.exe	103
PID 2308 wrote to memory of 4428	2308	cmd.exe	104
PID 2308 wrote to memory of 4428	2308	cmd.exe	104
PID 2308 wrote to memory of 4428	2308	cmd.exe	104

C:\Users\Admin\AppData\Local\Temp\cfb4e7b08343010cf746149e718c8737e4293390d02bc5bf30d46c5e73871651.exe
"C:\Users\Admin\AppData\Local\Temp\cfb4e7b08343010cf746149e718c8737e4293390d02bc5bf30d46c5e73871651.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3824
- C:\Users\Admin\AppData\Local\Temp\cfb4e7b08343010cf746149e718c8737e4293390d02bc5bf30d46c5e73871651.exe
  "{path}"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4756
- - C:\Users\Admin\AppData\Local\Temp\Ab.exe
    "C:\Users\Admin\AppData\Local\Temp\Ab.exe" 0
    3⤵
    - Checks computer location settings
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2912
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"' & exit
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:4112
    - - C:\Windows\SysWOW64\schtasks.exe
        
        schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"'
        5⤵
        System Location Discovery: System Language Discovery
        Scheduled Task/Job: Scheduled Task
        
        PID:2276
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpD01C.tmp.bat""
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:2308
    - - C:\Windows\SysWOW64\timeout.exe
        
        timeout 3
        5⤵
        System Location Discovery: System Language Discovery
        Delays execution with timeout.exe
        
        PID:1056
    - - C:\Users\Admin\AppData\Roaming\svchost.exe
        
        "C:\Users\Admin\AppData\Roaming\svchost.exe"
        5⤵
        Executes dropped EXE
        System Location Discovery: System Language Discovery
        Suspicious use of AdjustPrivilegeToken
        
        PID:4428
- - C:\Users\Admin\AppData\Local\Temp\BB.exe
    "C:\Users\Admin\AppData\Local\Temp\BB.exe" 0
    3⤵
    - Checks computer location settings
    - Executes dropped EXE
    - Adds Run key to start application
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3984
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\install.bat" "
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:4120
    - - C:\Windows\SysWOW64\PING.EXE
        
        PING 127.0.0.1 -n 2
        5⤵
        System Location Discovery: System Language Discovery
        System Network Configuration Discovery: Internet Connection Discovery
        Runs ping.exe
        
        PID:1688
    - - C:\Users\Admin\AppData\Roaming\remcos\mstsc.exe
        
        "C:\Users\Admin\AppData\Roaming\remcos\mstsc.exe"
        5⤵
        Executes dropped EXE
        Adds Run key to start application
        System Location Discovery: System Language Discovery
        Suspicious use of SetWindowsHookEx
        
        PID:4844

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

Remote System Discovery

T1018

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\Ab.exe

Filesize
45KB

MD5
855075698e4f11e8089f881c4b0237f8

SHA1
972785092ec9ba946fa90ad50198bc6f7bf5b234

SHA256
ab63fbbedf5b5ad5be373fb11ee84284efca4a58f6a34e0c3d6b885c16a81fbe

SHA512
75ce9e53f0e187b0f841d3ee6ee7c17621f9242177b971631c956b061c86447bfac949274bf1fe9d5e42f32e206cca5d837cfa1288cba57e6a2a93bc429d98ef

Download Submit
C:\Users\Admin\AppData\Local\Temp\BB.exe

Filesize
92KB

MD5
c8b3a05b20c5bdc2909cd4ec7e8509f3

SHA1
4797b824d0729d77b7d949e69819c36fa0bc0c15

SHA256
1d99246378ccf15778bd36cc3d85b09a6e53581c4cff5f441cc520dfb99896df

SHA512
307026de17c046cdd0ab56d869ba193e649e4459334b4d095c1e6274a7541f7b1c25c53de7e72139aaffde3a75e9243c91dfa3bd1d55183015d0abdf2e3e06cd

Download Submit
C:\Users\Admin\AppData\Local\Temp\install.bat

Filesize
98B

MD5
21bed91c3634ab147523bae86d71dc53

SHA1
0f81c75e634f83e300d33949bf48fb7e010d5480

SHA256
546eb97ad40e82000816ea08efeb65db8d17ab61e95bfb4b1df2bd8c33392968

SHA512
f4cd493bc9cba90d62efe5cf487c11679e05791797ff730a3cb168fe8a5a947c9965c2b71f378a70b805d1ef3e60834773eabba4fc82fe75d4c0a526ea04a38a

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpD01C.tmp.bat

Filesize
151B

MD5
3ca154cec1d93713fc3dc5c8c98c91ce

SHA1
e3600a4d79278eda70fa2015f278c5b24f44374d

SHA256
8f909ab6db8911220e2dc40a56e75fc832d1f7344697e222f940eb938573f713

SHA512
58cb658a060d120ffbf42abf2b561f6bc11ba76eb588996ba50be6d2b305435bf713f2b1cf22c19cd8d92c4d0118adfdaa543e66d58c6dddd0fb0528c2468423

Download Submit
memory/2912-38-0x000000007421E000-0x000000007421F000-memory.dmp

Filesize
4KB

Download
memory/2912-39-0x0000000000570000-0x0000000000582000-memory.dmp

Filesize
72KB

Download
memory/3824-5-0x0000000005730000-0x000000000573A000-memory.dmp

Filesize
40KB

Download
memory/3824-0-0x0000000074D2E000-0x0000000074D2F000-memory.dmp

Filesize
4KB

Download
memory/3824-8-0x0000000074D2E000-0x0000000074D2F000-memory.dmp

Filesize
4KB

Download
memory/3824-9-0x0000000074D20000-0x00000000754D0000-memory.dmp

Filesize
7.7MB

Download
memory/3824-10-0x0000000009A60000-0x0000000009ADE000-memory.dmp

Filesize
504KB

Download
memory/3824-11-0x0000000009940000-0x0000000009974000-memory.dmp

Filesize
208KB

Download
memory/3824-1-0x0000000000B00000-0x0000000000B7C000-memory.dmp

Filesize
496KB

Download
memory/3824-2-0x0000000005A20000-0x0000000005FC4000-memory.dmp

Filesize
5.6MB

Download
memory/3824-19-0x0000000074D20000-0x00000000754D0000-memory.dmp

Filesize
7.7MB

Download
memory/3824-6-0x0000000009490000-0x0000000009498000-memory.dmp

Filesize
32KB

Download
memory/3824-7-0x0000000009540000-0x00000000095DC000-memory.dmp

Filesize
624KB

Download
memory/3824-4-0x0000000074D20000-0x00000000754D0000-memory.dmp

Filesize
7.7MB

Download
memory/3824-3-0x0000000005560000-0x00000000055F2000-memory.dmp

Filesize
584KB

Download
memory/4756-40-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/4756-14-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/4756-12-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download