asyncrat | 80a014e40493d25ab26964e06ee2c8c885bb8c70d549d1eacd6fb2626cd9a9f5

General

Target

Drivers.exe
Size

21KB
MD5

3dbe554d99db5921c2869df9745b32be
SHA1

ec61ad96e9848de6e55121c8acd8be6221cc204b
SHA256

70b2d5ddb11d58b8a53d0fdc74259241057812e4dfc21a03b937a320e290d822
SHA512

6e752d09c1c214bd73f5295eb6ff65eb324d123a57de4ae5516b972f9ec3208e962aca9089f9ef6b91ca3c9394d5c6fd68e806012e9b4aff3f9277b3ee8cd6cc
SSDEEP

384:vTRQmNZSqP8MyoXKQmXNQltXpQyXlQx/uoOQtGQmXE9RrA5iXNjd2Ht5rkFJ0Wqx:WlOq2tzclrldjdKkFJCVA3g

Score

10^/10

asyncrat default discovery evasion rat trojan

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

136.243.175.182:7777

Mutex

9HD6aMtS9FtK

Attributes

delay
3
install
true
install_file
Runtime Broker.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

Modifies Windows Defender Real-time Protection settings 3 TTPs 4 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\DisableScanOnRealtimeEnable = "1"	Drivers.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection	Drivers.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	Drivers.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	Drivers.exe

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral1/files/0x0007000000023cc7-12.dat	family_asyncrat

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

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-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	Drivers.exe
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	Main.exe

Executes dropped EXE 2 IoCs

pid	Process
3824	Main.exe
4236	Runtime Broker.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	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	Runtime Broker.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Main.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2800	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
1144	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
3824	Main.exe
3824	Main.exe
3824	Main.exe
3824	Main.exe
3824	Main.exe
3824	Main.exe
3824	Main.exe
3824	Main.exe
3824	Main.exe
3824	Main.exe
3824	Main.exe
3824	Main.exe
3824	Main.exe
3824	Main.exe
3824	Main.exe
3824	Main.exe
3824	Main.exe
3824	Main.exe
3824	Main.exe
3824	Main.exe
3824	Main.exe
3824	Main.exe
3824	Main.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3824	Main.exe
Token: SeDebugPrivilege	4236	Runtime Broker.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 3088 wrote to memory of 3824	3088	Drivers.exe	85
PID 3088 wrote to memory of 3824	3088	Drivers.exe	85
PID 3088 wrote to memory of 3824	3088	Drivers.exe	85
PID 3824 wrote to memory of 1116	3824	Main.exe	88
PID 3824 wrote to memory of 1116	3824	Main.exe	88
PID 3824 wrote to memory of 1116	3824	Main.exe	88
PID 3824 wrote to memory of 4796	3824	Main.exe	90
PID 3824 wrote to memory of 4796	3824	Main.exe	90
PID 3824 wrote to memory of 4796	3824	Main.exe	90
PID 1116 wrote to memory of 1144	1116	cmd.exe	92
PID 1116 wrote to memory of 1144	1116	cmd.exe	92
PID 1116 wrote to memory of 1144	1116	cmd.exe	92
PID 4796 wrote to memory of 2800	4796	cmd.exe	93
PID 4796 wrote to memory of 2800	4796	cmd.exe	93
PID 4796 wrote to memory of 2800	4796	cmd.exe	93
PID 4796 wrote to memory of 4236	4796	cmd.exe	101
PID 4796 wrote to memory of 4236	4796	cmd.exe	101
PID 4796 wrote to memory of 4236	4796	cmd.exe	101

System policy modification 1 TTPs 4 IoCs

evasion

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoControlPanel = "1"	Drivers.exe
Key created	\REGISTRY\MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\System	Drivers.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableSettingsPage = "1"	Drivers.exe
Key created	\REGISTRY\MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer	Drivers.exe

C:\Users\Admin\AppData\Local\Temp\Drivers.exe
"C:\Users\Admin\AppData\Local\Temp\Drivers.exe"
1⤵
- Modifies Windows Defender Real-time Protection settings
- Checks computer location settings
- Suspicious use of WriteProcessMemory
- System policy modification
PID:3088
- 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:3824
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Runtime Broker" /tr '"C:\Users\Admin\AppData\Roaming\Runtime Broker.exe"' & exit
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:1116
  - - C:\Windows\SysWOW64\schtasks.exe
      schtasks /create /f /sc onlogon /rl highest /tn "Runtime Broker" /tr '"C:\Users\Admin\AppData\Roaming\Runtime Broker.exe"'
      4⤵
      System Location Discovery: System Language Discovery
      Scheduled Task/Job: Scheduled Task
      PID:1144
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpBDC2.tmp.bat""
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:4796
  - - C:\Windows\SysWOW64\timeout.exe
      timeout 3
      4⤵
      System Location Discovery: System Language Discovery
      Delays execution with timeout.exe
      PID:2800
  - - C:\Users\Admin\AppData\Roaming\Runtime Broker.exe
      "C:\Users\Admin\AppData\Roaming\Runtime Broker.exe"
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      Suspicious use of AdjustPrivilegeToken
      PID:4236

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Create or Modify System Process

1

T1543

Windows Service

1

T1543.003

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Create or Modify System Process

1

T1543

Windows Service

1

T1543.003

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Impair Defenses

1

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpBDC2.tmp.bat

Filesize
158B

MD5
aced0eaf91d2957ec4f9caf8ea3b9a5d

SHA1
0defba8d1f633b86521b44484cac60074d03d584

SHA256
423f9bf9dcf105d4f1663388390644752952fabaefb84daf66c4bb7547938f3f

SHA512
36c50ca5b9b2aa21387aada35a972bbab7c3b8266edc0ad01e0c2411f41c868fdaf2c2e804023baa2dbfd2d2ac2428aea9e95fd721dd743c742c7740d1972c6b

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

Filesize
45KB

MD5
3c1178d8a8669ab6be6cd9f7e0cbe003

SHA1
50899c700563e6e43a81ede481caa69c1e58eb39

SHA256
901f4d6b37e9e2d2e17f082579d014a28d362711f3c90a0ca6537fb9412cd6ab

SHA512
371c329eebda4d44d816a86a59e281e834c57713b2b5dea4ece025735874024487892c5a422a7857eecf0797b0ffe2dcb166edc4c874c487845550cb195a1d0b

Download Submit
memory/3824-24-0x00000000743D0000-0x0000000074B80000-memory.dmp

Filesize
7.7MB

Download
memory/3824-23-0x0000000000740000-0x0000000000752000-memory.dmp

Filesize
72KB

Download
memory/3824-25-0x0000000005000000-0x000000000509C000-memory.dmp

Filesize
624KB

Download
memory/3824-30-0x00000000743D0000-0x0000000074B80000-memory.dmp

Filesize
7.7MB

Download
memory/3824-22-0x00000000743DE000-0x00000000743DF000-memory.dmp

Filesize
4KB

Download
memory/4236-37-0x0000000006040000-0x00000000065E4000-memory.dmp

Filesize
5.6MB

Download
memory/4236-38-0x0000000005B00000-0x0000000005B66000-memory.dmp

Filesize
408KB

Download
memory/4236-39-0x0000000006B30000-0x0000000006BA6000-memory.dmp

Filesize
472KB

Download
memory/4236-40-0x0000000006AB0000-0x0000000006B18000-memory.dmp

Filesize
416KB

Download
memory/4236-41-0x0000000006C10000-0x0000000006C2E000-memory.dmp

Filesize
120KB

Download
memory/4236-42-0x0000000006F40000-0x0000000006FD2000-memory.dmp

Filesize
584KB

Download
memory/4236-43-0x0000000007020000-0x0000000007084000-memory.dmp

Filesize
400KB

Download

Resubmissions

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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