asyncrat | dcaf229e56e1b0f267d7e99b63920150ef1c18f8bcbf4da94c9ac592c75bdbe8

Analysis

max time kernel
95s
max time network
152s
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, 23:51

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General

Target
RC7 (5) (1)/First.exe
Size 139KB
Sample240804-3war6avale
SHA256 8bcb2329f01af33a1707f6a1a749987cfaff3976a9bcdbffad37d477dd5fd8ab
MD5 d5f71f93624190439b569498acca69a9
SHA1 323c616a5ed5e680b221f1db6acfa222e8be719a
SHA512 e03043bbd4389f77d337a33d92764496bd5a84654a95a3792de0a025765d43a795ef1351a64d96c6ae1f85daadc68a1c1fdc192a9adb153a15cf1cb71607b715
SSDEEP 3072:+iS4omp03WQthI/9S3BZi08iRQ1G78IVn27bSfcJK8ltX:+iS4ompB9S3BZi0a1G78IVhcgct
MD5 SHA1 SHA512 SSDEEP

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
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
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

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral8/files/0x00080000000234d5-2.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-1-5-21-4182098368-2521458979-3782681353-1000\Control Panel\International\Geo\Nation	Main.exe

Executes dropped EXE 2 IoCs

pid	Process
2300	Main.exe
2888	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	Main.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	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

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2176	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
3616	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
2300	Main.exe
2300	Main.exe
2300	Main.exe
2300	Main.exe
2300	Main.exe
2300	Main.exe
2300	Main.exe
2300	Main.exe
2300	Main.exe
2300	Main.exe
2300	Main.exe
2300	Main.exe
2300	Main.exe
2300	Main.exe
2300	Main.exe
2300	Main.exe
2300	Main.exe
2300	Main.exe
2300	Main.exe
2300	Main.exe
2300	Main.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2300	Main.exe
Token: SeDebugPrivilege	2888	Server-Host.exe
Token: SeDebugPrivilege	2888	Server-Host.exe

Suspicious use of WriteProcessMemory 46 IoCs

description	pid	Process	procid_target
PID 624 wrote to memory of 5088	624	First.exe	86
PID 624 wrote to memory of 5088	624	First.exe	86
PID 5088 wrote to memory of 244	5088	cmd.exe	89
PID 5088 wrote to memory of 244	5088	cmd.exe	89
PID 624 wrote to memory of 2400	624	First.exe	90
PID 624 wrote to memory of 2400	624	First.exe	90
PID 2400 wrote to memory of 1564	2400	cmd.exe	92
PID 2400 wrote to memory of 1564	2400	cmd.exe	92
PID 624 wrote to memory of 2032	624	First.exe	93
PID 624 wrote to memory of 2032	624	First.exe	93
PID 2032 wrote to memory of 224	2032	cmd.exe	95
PID 2032 wrote to memory of 224	2032	cmd.exe	95
PID 624 wrote to memory of 2412	624	First.exe	96
PID 624 wrote to memory of 2412	624	First.exe	96
PID 2412 wrote to memory of 2700	2412	cmd.exe	98
PID 2412 wrote to memory of 2700	2412	cmd.exe	98
PID 624 wrote to memory of 2800	624	First.exe	99
PID 624 wrote to memory of 2800	624	First.exe	99
PID 2800 wrote to memory of 2320	2800	cmd.exe	101
PID 2800 wrote to memory of 2320	2800	cmd.exe	101
PID 624 wrote to memory of 808	624	First.exe	102
PID 624 wrote to memory of 808	624	First.exe	102
PID 808 wrote to memory of 4596	808	cmd.exe	104
PID 808 wrote to memory of 4596	808	cmd.exe	104
PID 624 wrote to memory of 336	624	First.exe	105
PID 624 wrote to memory of 336	624	First.exe	105
PID 336 wrote to memory of 2060	336	cmd.exe	107
PID 336 wrote to memory of 2060	336	cmd.exe	107
PID 624 wrote to memory of 2300	624	First.exe	108
PID 624 wrote to memory of 2300	624	First.exe	108
PID 624 wrote to memory of 2300	624	First.exe	108
PID 2300 wrote to memory of 1144	2300	Main.exe	109
PID 2300 wrote to memory of 1144	2300	Main.exe	109
PID 2300 wrote to memory of 1144	2300	Main.exe	109
PID 2300 wrote to memory of 4056	2300	Main.exe	111
PID 2300 wrote to memory of 4056	2300	Main.exe	111
PID 2300 wrote to memory of 4056	2300	Main.exe	111
PID 1144 wrote to memory of 3616	1144	cmd.exe	113
PID 1144 wrote to memory of 3616	1144	cmd.exe	113
PID 1144 wrote to memory of 3616	1144	cmd.exe	113
PID 4056 wrote to memory of 2176	4056	cmd.exe	114
PID 4056 wrote to memory of 2176	4056	cmd.exe	114
PID 4056 wrote to memory of 2176	4056	cmd.exe	114
PID 4056 wrote to memory of 2888	4056	cmd.exe	115
PID 4056 wrote to memory of 2888	4056	cmd.exe	115
PID 4056 wrote to memory of 2888	4056	cmd.exe	115

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:624
- 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:5088
- - C:\Windows\system32\reg.exe
    reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender" /v DisableAntiSpyware /t REG_DWORD /d 1 /f
    3⤵
    PID:244
- 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:2400
- - 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:1564
- 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:2032
- - 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:224
- 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:2412
- - 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:2700
- 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:2800
- - C:\Windows\system32\reg.exe
    reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System" /v DisableTaskMgr /t REG_DWORD /d 1 /f
    3⤵
    PID:2320
- 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:808
- - C:\Windows\system32\reg.exe
    reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer" /v NoControlPanel /t REG_DWORD /d 1 /f
    3⤵
    PID:4596
- 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:336
- - C:\Windows\system32\reg.exe
    reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System" /v DisableSettingsPage /t REG_DWORD /d 1 /f
    3⤵
    PID:2060
- 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:2300
- - 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:1144
  - - 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:3616
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpD532.tmp.bat""
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:4056
  - - C:\Windows\SysWOW64\timeout.exe
      timeout 3
      4⤵
      System Location Discovery: System Language Discovery
      Delays execution with timeout.exe
      PID:2176
  - - 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:2888

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

tmpD532.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmpD532.tmp.bat
Size 155B
SHA256 37846369d2320d6b6d6791b4da44df7a791520d74fdd7a777667cabe7517f657
MD5 92e3e000af7540350c6a7811ac6af397
SHA1 7d5fd2eab804e0a50ec0cd4d09af0dd528839621
SHA512 032fe288f27527bfdf8448d827f6fbe59b13707022d365d01b43f1dec04f80c6ae67da42f2192f860fa487be8754a0bbd4df1dd6b5a34304fe183e926e80c176
MD5 SHA1 SHA512

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Main.exe

Path C:\Users\Admin\AppData\Roaming\Main.exe
Size 45KB
SHA256 be351f8d13bd9e018a7df090bfe4e4ed4b4976ab65e0c36eea3f83ac5e475f0f
MD5 0f403599792ecdd23aa6834cb51f509e
SHA1 bcc135a6107eef55ebc89544cf584ea700f914dc
SHA512 88cec361ff710ce74a1d6bf773984f8a57dfd117ebda48533f8f0394692576c16b0797a06766a5ec67f2ed8dc45632e2c181ad572f3c98ccdff786ba2fb63231
SSDEEP 768:CuokxmFTkUE1YAgWUOl1nyamo2qRDcP0pycvHPI6zjbXgX3ihJee5h9ABDZ2x:CuokxmFTkUMYi1t2AccMcvg63bwXShDD
MD5 SHA1 SHA512 SSDEEP

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memory/2300-4-0x0000000000BC0000-0x0000000000BD2000-memory.dmp

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memory/2300-5-0x0000000005580000-0x000000000561C000-memory.dmp

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memory/2888-14-0x0000000005C20000-0x00000000061C4000-memory.dmp

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memory/2888-15-0x0000000005340000-0x00000000053A6000-memory.dmp

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