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
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
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	Drivers.exe

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral2/files/0x00280000000460c7-12.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-1-5-21-3226857575-536881564-1522996248-1000\Control Panel\International\Geo\Nation	Drivers.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3226857575-536881564-1522996248-1000\Control Panel\International\Geo\Nation	Main.exe

Executes dropped EXE 2 IoCs

pid	Process
112	Main.exe
3872	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	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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Runtime Broker.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2440	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
2020	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
112	Main.exe
112	Main.exe
112	Main.exe
112	Main.exe
112	Main.exe
112	Main.exe
112	Main.exe
112	Main.exe
112	Main.exe
112	Main.exe
112	Main.exe
112	Main.exe
112	Main.exe
112	Main.exe
112	Main.exe
112	Main.exe
112	Main.exe
112	Main.exe
112	Main.exe
112	Main.exe
112	Main.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	112	Main.exe
Token: SeDebugPrivilege	3872	Runtime Broker.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 692 wrote to memory of 112	692	Drivers.exe	82
PID 692 wrote to memory of 112	692	Drivers.exe	82
PID 692 wrote to memory of 112	692	Drivers.exe	82
PID 112 wrote to memory of 1100	112	Main.exe	88
PID 112 wrote to memory of 1100	112	Main.exe	88
PID 112 wrote to memory of 1100	112	Main.exe	88
PID 112 wrote to memory of 1984	112	Main.exe	90
PID 112 wrote to memory of 1984	112	Main.exe	90
PID 112 wrote to memory of 1984	112	Main.exe	90
PID 1984 wrote to memory of 2440	1984	cmd.exe	92
PID 1984 wrote to memory of 2440	1984	cmd.exe	92
PID 1984 wrote to memory of 2440	1984	cmd.exe	92
PID 1100 wrote to memory of 2020	1100	cmd.exe	93
PID 1100 wrote to memory of 2020	1100	cmd.exe	93
PID 1100 wrote to memory of 2020	1100	cmd.exe	93
PID 1984 wrote to memory of 3872	1984	cmd.exe	95
PID 1984 wrote to memory of 3872	1984	cmd.exe	95
PID 1984 wrote to memory of 3872	1984	cmd.exe	95

System policy modification 1 TTPs 4 IoCs

evasion

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer	Drivers.exe
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

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:692
- 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:112
- - 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:1100
  - - 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:2020
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp8879.tmp.bat""
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:1984
  - - C:\Windows\SysWOW64\timeout.exe
      timeout 3
      4⤵
      System Location Discovery: System Language Discovery
      Delays execution with timeout.exe
      PID:2440
  - - 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:3872

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\tmp8879.tmp.bat

Filesize
158B

MD5
e7d359c432e2e81676042ba7791f82a0

SHA1
1fa57c890ecdf6e9adabba86df21106ff13ec1c7

SHA256
5e21f6c835af3688a07b14343a74609155d4234820abbd1595f393e8ad58b209

SHA512
0aa8f0f0fac5a3b0c08c09140787856d34326a144167181dc9413419d6d5e97021214098f6ff3372429f87131eb421e4c538e00391295b1aa5eccfed405e7b4f

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

Filesize
45KB

MD5
3c1178d8a8669ab6be6cd9f7e0cbe003

SHA1
50899c700563e6e43a81ede481caa69c1e58eb39

SHA256
901f4d6b37e9e2d2e17f082579d014a28d362711f3c90a0ca6537fb9412cd6ab

SHA512
371c329eebda4d44d816a86a59e281e834c57713b2b5dea4ece025735874024487892c5a422a7857eecf0797b0ffe2dcb166edc4c874c487845550cb195a1d0b

Download Submit
memory/112-25-0x0000000074A9E000-0x0000000074A9F000-memory.dmp

Filesize
4KB

Download
memory/112-26-0x0000000000DB0000-0x0000000000DC2000-memory.dmp

Filesize
72KB

Download
memory/112-27-0x0000000074A90000-0x0000000075241000-memory.dmp

Filesize
7.7MB

Download
memory/112-28-0x0000000005630000-0x00000000056CC000-memory.dmp

Filesize
624KB

Download
memory/112-33-0x0000000074A90000-0x0000000075241000-memory.dmp

Filesize
7.7MB

Download
memory/3872-40-0x00000000061B0000-0x0000000006756000-memory.dmp

Filesize
5.6MB

Download
memory/3872-41-0x0000000005CD0000-0x0000000005D36000-memory.dmp

Filesize
408KB

Download
memory/3872-42-0x0000000006C20000-0x0000000006C96000-memory.dmp

Filesize
472KB

Download
memory/3872-43-0x0000000006BA0000-0x0000000006C04000-memory.dmp

Filesize
400KB

Download
memory/3872-44-0x0000000006CD0000-0x0000000006CEE000-memory.dmp

Filesize
120KB

Download

Resubmissions

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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