asyncrat | 83923b2bb65492892ef63d18dff00654431b27cd409d8fd67d4ba0eadc052c6a

Analysis

max time kernel
24s
max time network
153s
platform
windows10_x64
resource
win10v20210410
submitted
14/07/2021, 13:51

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General

Target
a63b54e6077c5d034c060adc869e8c3c.exe
Size 165KB
Sample210714-gh2n2qs2aa
SHA256 83923b2bb65492892ef63d18dff00654431b27cd409d8fd67d4ba0eadc052c6a
MD5 a63b54e6077c5d034c060adc869e8c3c
SHA1 fc59c4232058744b1495b3d546a5d4cba11d79f7
SHA512 1233905e6fd5bf5334fd47185f7ea69ab94209ae8761c2ac9236a168b73ef6765996f1bde20e9455430556499efed23699328b4ac6388aab155e00e2d7ff65b9
MD5 SHA1 SHA512

Score

10^/10

asyncrat rat

Malware Config

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers.
rat asyncrat

Async RAT payload 5 IoCs

rat

resource	yara_rule
behavioral2/memory/2360-121-0x0000000000400000-0x0000000000416000-memory.dmp	asyncrat
behavioral2/memory/2360-122-0x000000000041058E-mapping.dmp	asyncrat
behavioral2/memory/2228-141-0x000000000041058E-mapping.dmp	asyncrat
behavioral2/memory/2228-152-0x0000000006D20000-0x0000000006D7E000-memory.dmp	asyncrat
behavioral2/memory/4084-159-0x000000000041058E-mapping.dmp	asyncrat

Executes dropped EXE 6 IoCs

pid	Process
1636	43534.exe
2360	43534.exe
800	svchost.exe
2228	svchost.exe
1228	svchost.exe
4084	svchost.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1636 set thread context of 2360	1636	43534.exe	75
PID 800 set thread context of 2228	800	svchost.exe	86
PID 1228 set thread context of 4084	1228	svchost.exe	89

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

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

persistence

Scheduled Task

T1053

pid	Process
3856	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2072	timeout.exe

Suspicious behavior: EnumeratesProcesses 42 IoCs

pid	Process
4084	a63b54e6077c5d034c060adc869e8c3c.exe
4084	a63b54e6077c5d034c060adc869e8c3c.exe
4084	a63b54e6077c5d034c060adc869e8c3c.exe
4084	a63b54e6077c5d034c060adc869e8c3c.exe
4084	a63b54e6077c5d034c060adc869e8c3c.exe
4084	a63b54e6077c5d034c060adc869e8c3c.exe
2360	43534.exe
4084	a63b54e6077c5d034c060adc869e8c3c.exe
4084	a63b54e6077c5d034c060adc869e8c3c.exe
2360	43534.exe
2360	43534.exe
2360	43534.exe
2360	43534.exe
2360	43534.exe
2360	43534.exe
2360	43534.exe
2360	43534.exe
2360	43534.exe
2360	43534.exe
2360	43534.exe
2360	43534.exe
2360	43534.exe
2360	43534.exe
4084	a63b54e6077c5d034c060adc869e8c3c.exe
4084	a63b54e6077c5d034c060adc869e8c3c.exe
2228	svchost.exe
2228	svchost.exe
2228	svchost.exe
2228	svchost.exe
2228	svchost.exe
2228	svchost.exe
2228	svchost.exe
2228	svchost.exe
2228	svchost.exe
2228	svchost.exe
2228	svchost.exe
2228	svchost.exe
2228	svchost.exe
2228	svchost.exe
2228	svchost.exe
2228	svchost.exe
2228	svchost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2360	43534.exe
Token: SeDebugPrivilege	2228	svchost.exe

Suspicious use of WriteProcessMemory 42 IoCs

description	pid	Process	procid_target
PID 4084 wrote to memory of 1636	4084	a63b54e6077c5d034c060adc869e8c3c.exe	74
PID 4084 wrote to memory of 1636	4084	a63b54e6077c5d034c060adc869e8c3c.exe	74
PID 4084 wrote to memory of 1636	4084	a63b54e6077c5d034c060adc869e8c3c.exe	74
PID 1636 wrote to memory of 2360	1636	43534.exe	75
PID 1636 wrote to memory of 2360	1636	43534.exe	75
PID 1636 wrote to memory of 2360	1636	43534.exe	75
PID 1636 wrote to memory of 2360	1636	43534.exe	75
PID 1636 wrote to memory of 2360	1636	43534.exe	75
PID 1636 wrote to memory of 2360	1636	43534.exe	75
PID 1636 wrote to memory of 2360	1636	43534.exe	75
PID 1636 wrote to memory of 2360	1636	43534.exe	75
PID 2360 wrote to memory of 3692	2360	43534.exe	79
PID 2360 wrote to memory of 3692	2360	43534.exe	79
PID 2360 wrote to memory of 3692	2360	43534.exe	79
PID 2360 wrote to memory of 3224	2360	43534.exe	81
PID 2360 wrote to memory of 3224	2360	43534.exe	81
PID 2360 wrote to memory of 3224	2360	43534.exe	81
PID 3224 wrote to memory of 2072	3224	cmd.exe	83
PID 3224 wrote to memory of 2072	3224	cmd.exe	83
PID 3224 wrote to memory of 2072	3224	cmd.exe	83
PID 3692 wrote to memory of 3856	3692	cmd.exe	84
PID 3692 wrote to memory of 3856	3692	cmd.exe	84
PID 3692 wrote to memory of 3856	3692	cmd.exe	84
PID 3224 wrote to memory of 800	3224	cmd.exe	85
PID 3224 wrote to memory of 800	3224	cmd.exe	85
PID 3224 wrote to memory of 800	3224	cmd.exe	85
PID 800 wrote to memory of 2228	800	svchost.exe	86
PID 800 wrote to memory of 2228	800	svchost.exe	86
PID 800 wrote to memory of 2228	800	svchost.exe	86
PID 800 wrote to memory of 2228	800	svchost.exe	86
PID 800 wrote to memory of 2228	800	svchost.exe	86
PID 800 wrote to memory of 2228	800	svchost.exe	86
PID 800 wrote to memory of 2228	800	svchost.exe	86
PID 800 wrote to memory of 2228	800	svchost.exe	86
PID 1228 wrote to memory of 4084	1228	svchost.exe	89
PID 1228 wrote to memory of 4084	1228	svchost.exe	89
PID 1228 wrote to memory of 4084	1228	svchost.exe	89
PID 1228 wrote to memory of 4084	1228	svchost.exe	89
PID 1228 wrote to memory of 4084	1228	svchost.exe	89
PID 1228 wrote to memory of 4084	1228	svchost.exe	89
PID 1228 wrote to memory of 4084	1228	svchost.exe	89
PID 1228 wrote to memory of 4084	1228	svchost.exe	89

C:\Users\Admin\AppData\Local\Temp\a63b54e6077c5d034c060adc869e8c3c.exe
"C:\Users\Admin\AppData\Local\Temp\a63b54e6077c5d034c060adc869e8c3c.exe"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:4084
- C:\Users\Admin\AppData\Local\Temp\43534.exe
  43534.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious use of WriteProcessMemory
  PID:1636
- - C:\Users\Admin\AppData\Local\Temp\43534.exe
    "C:\Users\Admin\AppData\Local\Temp\43534.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2360
  - - 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⤵
      Suspicious use of WriteProcessMemory
      PID:3692
    - - C:\Windows\SysWOW64\schtasks.exe
        
        schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"'
        5⤵
        Creates scheduled task(s)
        
        PID:3856
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp2F24.tmp.bat""
      4⤵
      Suspicious use of WriteProcessMemory
      PID:3224
    - - C:\Windows\SysWOW64\timeout.exe
        
        timeout 3
        5⤵
        Delays execution with timeout.exe
        
        PID:2072
    - - C:\Users\Admin\AppData\Roaming\svchost.exe
        
        "C:\Users\Admin\AppData\Roaming\svchost.exe"
        5⤵
        Executes dropped EXE
        Suspicious use of SetThreadContext
        Suspicious use of WriteProcessMemory
        
        PID:800
      - C:\Users\Admin\AppData\Roaming\svchost.exe
        
        "C:\Users\Admin\AppData\Roaming\svchost.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2228

C:\Users\Admin\AppData\Local\Temp\svchost.exe
C:\Users\Admin\AppData\Local\Temp\svchost.exe
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1228
- C:\Users\Admin\AppData\Local\Temp\svchost.exe
  "C:\Users\Admin\AppData\Local\Temp\svchost.exe"
  2⤵
  - Executes dropped EXE
  PID:4084

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/800-146-0x0000000005C01000-0x0000000005C02000-memory.dmp

Download

memory/800-138-0x0000000000320000-0x0000000000321000-memory.dmp

Download

memory/1228-156-0x0000000001370000-0x0000000001371000-memory.dmp

Download

memory/1228-163-0x0000000005601000-0x0000000005602000-memory.dmp

Download

memory/1636-127-0x0000000004B20000-0x0000000004B21000-memory.dmp

Download

memory/1636-119-0x0000000000210000-0x0000000000211000-memory.dmp

Download

memory/2228-151-0x0000000006DA0000-0x0000000006DA1000-memory.dmp

Download

memory/2228-153-0x0000000006E20000-0x0000000006E21000-memory.dmp

Download

memory/2228-152-0x0000000006D20000-0x0000000006D7E000-memory.dmp

Download

memory/2228-147-0x0000000005401000-0x0000000005402000-memory.dmp

Download

memory/2228-148-0x0000000005D00000-0x0000000005D01000-memory.dmp

Download

memory/2228-149-0x00000000062A0000-0x00000000062A1000-memory.dmp

Download

memory/2228-150-0x0000000005DA0000-0x0000000005DA1000-memory.dmp

Download

memory/2360-128-0x0000000004D50000-0x0000000004D51000-memory.dmp

Download

memory/2360-121-0x0000000000400000-0x0000000000416000-memory.dmp

Download

memory/4084-114-0x0000000000D50000-0x0000000000D51000-memory.dmp

Download

memory/4084-134-0x0000000004DF0000-0x0000000004DF1000-memory.dmp

Download

memory/4084-164-0x0000000005401000-0x0000000005402000-memory.dmp

Download