asyncrat | dcaf229e56e1b0f267d7e99b63920150ef1c18f8bcbf4da94c9ac592c75bdbe8

Analysis

max time kernel
92s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
04/08/2024, 23:55

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General

Target

RC7 (5) (1)/First.exe
Size

139KB
MD5

d5f71f93624190439b569498acca69a9
SHA1

323c616a5ed5e680b221f1db6acfa222e8be719a
SHA256

8bcb2329f01af33a1707f6a1a749987cfaff3976a9bcdbffad37d477dd5fd8ab
SHA512

e03043bbd4389f77d337a33d92764496bd5a84654a95a3792de0a025765d43a795ef1351a64d96c6ae1f85daadc68a1c1fdc192a9adb153a15cf1cb71607b715
SSDEEP

3072:+iS4omp03WQthI/9S3BZi08iRQ1G78IVn27bSfcJK8ltX:+iS4ompB9S3BZi0a1G78IVhcgct

Score

10^/10

asyncrat default discovery evasion rat trojan

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

45.90.13.137:7707

Mutex

HleCBmrMxwFA

Attributes

delay
3
install
true
install_file
Server-Host.exe
install_folder
%AppData%

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat

Modifies Windows Defender Real-time Protection settings 3 TTPs 6 IoCs

evasion trojan

Modify Registry

T1112

Windows Service

T1543.003

Disable or Modify Tools

T1562.001

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	reg.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection	reg.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	reg.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection	reg.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	reg.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection	reg.exe

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral4/files/0x0007000000023490-2.dat	family_asyncrat

Disables Task Manager via registry modification
evasion
Downloads MZ/PE file

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-1-5-21-1194130065-3471212556-1656947724-1000\Control Panel\International\Geo\Nation	Main.exe

Executes dropped EXE 2 IoCs

pid	Process
1968	Main.exe
1980	Server-Host.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 6 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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Server-Host.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Main.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2664	timeout.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
748	schtasks.exe

Suspicious behavior: EnumeratesProcesses 19 IoCs

pid	Process
1968	Main.exe
1968	Main.exe
1968	Main.exe
1968	Main.exe
1968	Main.exe
1968	Main.exe
1968	Main.exe
1968	Main.exe
1968	Main.exe
1968	Main.exe
1968	Main.exe
1968	Main.exe
1968	Main.exe
1968	Main.exe
1968	Main.exe
1968	Main.exe
1968	Main.exe
1968	Main.exe
1968	Main.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1968	Main.exe
Token: SeDebugPrivilege	1980	Server-Host.exe
Token: SeDebugPrivilege	1980	Server-Host.exe

Suspicious use of WriteProcessMemory 46 IoCs

description	pid	Process	procid_target
PID 3188 wrote to memory of 1336	3188	First.exe	85
PID 3188 wrote to memory of 1336	3188	First.exe	85
PID 1336 wrote to memory of 2172	1336	cmd.exe	87
PID 1336 wrote to memory of 2172	1336	cmd.exe	87
PID 3188 wrote to memory of 2948	3188	First.exe	89
PID 3188 wrote to memory of 2948	3188	First.exe	89
PID 2948 wrote to memory of 5100	2948	cmd.exe	91
PID 2948 wrote to memory of 5100	2948	cmd.exe	91
PID 3188 wrote to memory of 2156	3188	First.exe	92
PID 3188 wrote to memory of 2156	3188	First.exe	92
PID 2156 wrote to memory of 2360	2156	cmd.exe	94
PID 2156 wrote to memory of 2360	2156	cmd.exe	94
PID 3188 wrote to memory of 2956	3188	First.exe	95
PID 3188 wrote to memory of 2956	3188	First.exe	95
PID 2956 wrote to memory of 2632	2956	cmd.exe	97
PID 2956 wrote to memory of 2632	2956	cmd.exe	97
PID 3188 wrote to memory of 3528	3188	First.exe	98
PID 3188 wrote to memory of 3528	3188	First.exe	98
PID 3528 wrote to memory of 4748	3528	cmd.exe	100
PID 3528 wrote to memory of 4748	3528	cmd.exe	100
PID 3188 wrote to memory of 1928	3188	First.exe	102
PID 3188 wrote to memory of 1928	3188	First.exe	102
PID 1928 wrote to memory of 4988	1928	cmd.exe	104
PID 1928 wrote to memory of 4988	1928	cmd.exe	104
PID 3188 wrote to memory of 2320	3188	First.exe	105
PID 3188 wrote to memory of 2320	3188	First.exe	105
PID 2320 wrote to memory of 4528	2320	cmd.exe	107
PID 2320 wrote to memory of 4528	2320	cmd.exe	107
PID 3188 wrote to memory of 1968	3188	First.exe	109
PID 3188 wrote to memory of 1968	3188	First.exe	109
PID 3188 wrote to memory of 1968	3188	First.exe	109
PID 1968 wrote to memory of 2792	1968	Main.exe	111
PID 1968 wrote to memory of 2792	1968	Main.exe	111
PID 1968 wrote to memory of 2792	1968	Main.exe	111
PID 1968 wrote to memory of 2164	1968	Main.exe	113
PID 1968 wrote to memory of 2164	1968	Main.exe	113
PID 1968 wrote to memory of 2164	1968	Main.exe	113
PID 2164 wrote to memory of 2664	2164	cmd.exe	115
PID 2164 wrote to memory of 2664	2164	cmd.exe	115
PID 2164 wrote to memory of 2664	2164	cmd.exe	115
PID 2792 wrote to memory of 748	2792	cmd.exe	116
PID 2792 wrote to memory of 748	2792	cmd.exe	116
PID 2792 wrote to memory of 748	2792	cmd.exe	116
PID 2164 wrote to memory of 1980	2164	cmd.exe	117
PID 2164 wrote to memory of 1980	2164	cmd.exe	117
PID 2164 wrote to memory of 1980	2164	cmd.exe	117

C:\Users\Admin\AppData\Local\Temp\RC7 (5) (1)\First.exe
"C:\Users\Admin\AppData\Local\Temp\RC7 (5) (1)\First.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:3188
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe" /c reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender" /v DisableAntiSpyware /t REG_DWORD /d 1 /f
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1336
- - C:\Windows\system32\reg.exe
    reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender" /v DisableAntiSpyware /t REG_DWORD /d 1 /f
    3⤵
    PID:2172
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe" /c reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection" /v DisableBehaviorMonitoring /t REG_DWORD /d 1 /f
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2948
- - C:\Windows\system32\reg.exe
    reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection" /v DisableBehaviorMonitoring /t REG_DWORD /d 1 /f
    3⤵
    - Modifies Windows Defender Real-time Protection settings
    PID:5100
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe" /c reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection" /v DisableOnAccessProtection /t REG_DWORD /d 1 /f
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2156
- - C:\Windows\system32\reg.exe
    reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection" /v DisableOnAccessProtection /t REG_DWORD /d 1 /f
    3⤵
    - Modifies Windows Defender Real-time Protection settings
    PID:2360
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe" /c reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection" /v DisableScanOnRealtimeEnable /t REG_DWORD /d 1 /f
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2956
- - C:\Windows\system32\reg.exe
    reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection" /v DisableScanOnRealtimeEnable /t REG_DWORD /d 1 /f
    3⤵
    - Modifies Windows Defender Real-time Protection settings
    PID:2632
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe" /c reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System" /v DisableTaskMgr /t REG_DWORD /d 1 /f
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3528
- - C:\Windows\system32\reg.exe
    reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System" /v DisableTaskMgr /t REG_DWORD /d 1 /f
    3⤵
    PID:4748
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe" /c reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer" /v NoControlPanel /t REG_DWORD /d 1 /f
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1928
- - C:\Windows\system32\reg.exe
    reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer" /v NoControlPanel /t REG_DWORD /d 1 /f
    3⤵
    PID:4988
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe" /c reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System" /v DisableSettingsPage /t REG_DWORD /d 1 /f
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2320
- - C:\Windows\system32\reg.exe
    reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System" /v DisableSettingsPage /t REG_DWORD /d 1 /f
    3⤵
    PID:4528
- C:\Users\Admin\AppData\Roaming\Main.exe
  "C:\Users\Admin\AppData\Roaming\Main.exe"
  2⤵
  - 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:1968
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Server-Host" /tr '"C:\Users\Admin\AppData\Roaming\Server-Host.exe"' & exit
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2792
  - - C:\Windows\SysWOW64\schtasks.exe
      schtasks /create /f /sc onlogon /rl highest /tn "Server-Host" /tr '"C:\Users\Admin\AppData\Roaming\Server-Host.exe"'
      4⤵
      System Location Discovery: System Language Discovery
      Scheduled Task/Job: Scheduled Task
      PID:748
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpD997.tmp.bat""
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2164
  - - C:\Windows\SysWOW64\timeout.exe
      timeout 3
      4⤵
      System Location Discovery: System Language Discovery
      Delays execution with timeout.exe
      PID:2664
  - - C:\Users\Admin\AppData\Roaming\Server-Host.exe
      "C:\Users\Admin\AppData\Roaming\Server-Host.exe"
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      Suspicious use of AdjustPrivilegeToken
      PID:1980

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Create or Modify System Process

T1543

Windows Service

T1543.003

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Create or Modify System Process

T1543

Windows Service

T1543.003

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

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\tmpD997.tmp.bat

Filesize
155B

MD5
8fdcba6b05fb95ff6297efbc71eaa5b1

SHA1
5c705d24ad961ee1abb996b1027d9322085e0a62

SHA256
996d32986ecc25c01b3d9bac4154133053edd5c434116bdaf886e0396e35ad9c

SHA512
d7d34c1c15c688c4db4be2af890234d879165667570a77076bb7730b2e9549eca9be377d4f88ffc561af36790e2e3bcf95e29018bd757dc1c2c324d438b926ca

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

Filesize
45KB

MD5
0f403599792ecdd23aa6834cb51f509e

SHA1
bcc135a6107eef55ebc89544cf584ea700f914dc

SHA256
be351f8d13bd9e018a7df090bfe4e4ed4b4976ab65e0c36eea3f83ac5e475f0f

SHA512
88cec361ff710ce74a1d6bf773984f8a57dfd117ebda48533f8f0394692576c16b0797a06766a5ec67f2ed8dc45632e2c181ad572f3c98ccdff786ba2fb63231

Download Submit
memory/1968-4-0x0000000000680000-0x0000000000692000-memory.dmp

Filesize
72KB

Download
memory/1968-5-0x00000000050B0000-0x000000000514C000-memory.dmp

Filesize
624KB

Download
memory/1980-14-0x0000000005B20000-0x00000000060C4000-memory.dmp

Filesize
5.6MB

Download
memory/1980-15-0x0000000005570000-0x00000000055D6000-memory.dmp

Filesize
408KB

Download