asyncrat | 37240b0a8e09cad3b2f6f3e6db18279d653c36bbfa2813c2ef0f03055efb216d

Analysis

max time kernel
127s
max time network
152s
platform
windows10_x64
resource
win10v20210408
submitted
22/09/2021, 12:25

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General

Target
P03000--------18092021.exe
Size 536KB
Sample210922-pll6jsceh3
SHA256 37240b0a8e09cad3b2f6f3e6db18279d653c36bbfa2813c2ef0f03055efb216d
MD5 6e2281a0d6ff813f086dd8acf0c8d73f
SHA1 d09d000c4afd4464bcdd0eadf01075889bc6f7b2
SHA512 552a60be1b42e12f5505a281dc06230b9668d33b37860f32e75686ccc1fc99ad491ca340561cc1a1dba2848f38d28a49ae9ffe71bc0487f94f3a8f0548a0ca89
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 3 IoCs

rat

resource	yara_rule
behavioral2/memory/4020-124-0x0000000000400000-0x0000000000412000-memory.dmp	asyncrat
behavioral2/memory/4020-125-0x000000000040D06E-mapping.dmp	asyncrat
behavioral2/memory/4084-152-0x000000000040D06E-mapping.dmp	asyncrat

Executes dropped EXE 4 IoCs

pid	Process
744	dew.exe
2476	dew.exe
3328	dew.exe
4084	dew.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 636 set thread context of 4020	636	P03000--------18092021.exe	71
PID 744 set thread context of 4084	744	dew.exe	85

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
3820	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
852	timeout.exe

Suspicious behavior: EnumeratesProcesses 19 IoCs

pid	Process
4020	P03000--------18092021.exe
4020	P03000--------18092021.exe
4020	P03000--------18092021.exe
4020	P03000--------18092021.exe
4020	P03000--------18092021.exe
4020	P03000--------18092021.exe
4020	P03000--------18092021.exe
4020	P03000--------18092021.exe
4020	P03000--------18092021.exe
4020	P03000--------18092021.exe
4020	P03000--------18092021.exe
4020	P03000--------18092021.exe
4020	P03000--------18092021.exe
4020	P03000--------18092021.exe
4020	P03000--------18092021.exe
744	dew.exe
744	dew.exe
744	dew.exe
744	dew.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4020	P03000--------18092021.exe
Token: SeDebugPrivilege	744	dew.exe
Token: SeDebugPrivilege	4084	dew.exe

Suspicious use of WriteProcessMemory 37 IoCs

description	pid	Process	procid_target
PID 636 wrote to memory of 4020	636	P03000--------18092021.exe	71
PID 636 wrote to memory of 4020	636	P03000--------18092021.exe	71
PID 636 wrote to memory of 4020	636	P03000--------18092021.exe	71
PID 636 wrote to memory of 4020	636	P03000--------18092021.exe	71
PID 636 wrote to memory of 4020	636	P03000--------18092021.exe	71
PID 636 wrote to memory of 4020	636	P03000--------18092021.exe	71
PID 636 wrote to memory of 4020	636	P03000--------18092021.exe	71
PID 636 wrote to memory of 4020	636	P03000--------18092021.exe	71
PID 4020 wrote to memory of 2804	4020	P03000--------18092021.exe	75
PID 4020 wrote to memory of 2804	4020	P03000--------18092021.exe	75
PID 4020 wrote to memory of 2804	4020	P03000--------18092021.exe	75
PID 4020 wrote to memory of 416	4020	P03000--------18092021.exe	76
PID 4020 wrote to memory of 416	4020	P03000--------18092021.exe	76
PID 4020 wrote to memory of 416	4020	P03000--------18092021.exe	76
PID 2804 wrote to memory of 3820	2804	cmd.exe	79
PID 2804 wrote to memory of 3820	2804	cmd.exe	79
PID 2804 wrote to memory of 3820	2804	cmd.exe	79
PID 416 wrote to memory of 852	416	cmd.exe	80
PID 416 wrote to memory of 852	416	cmd.exe	80
PID 416 wrote to memory of 852	416	cmd.exe	80
PID 416 wrote to memory of 744	416	cmd.exe	82
PID 416 wrote to memory of 744	416	cmd.exe	82
PID 416 wrote to memory of 744	416	cmd.exe	82
PID 744 wrote to memory of 2476	744	dew.exe	83
PID 744 wrote to memory of 2476	744	dew.exe	83
PID 744 wrote to memory of 2476	744	dew.exe	83
PID 744 wrote to memory of 3328	744	dew.exe	84
PID 744 wrote to memory of 3328	744	dew.exe	84
PID 744 wrote to memory of 3328	744	dew.exe	84
PID 744 wrote to memory of 4084	744	dew.exe	85
PID 744 wrote to memory of 4084	744	dew.exe	85
PID 744 wrote to memory of 4084	744	dew.exe	85
PID 744 wrote to memory of 4084	744	dew.exe	85
PID 744 wrote to memory of 4084	744	dew.exe	85
PID 744 wrote to memory of 4084	744	dew.exe	85
PID 744 wrote to memory of 4084	744	dew.exe	85
PID 744 wrote to memory of 4084	744	dew.exe	85

C:\Users\Admin\AppData\Local\Temp\P03000--------18092021.exe
"C:\Users\Admin\AppData\Local\Temp\P03000--------18092021.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:636
- C:\Users\Admin\AppData\Local\Temp\P03000--------18092021.exe
  "C:\Users\Admin\AppData\Local\Temp\P03000--------18092021.exe"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4020
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "dew" /tr '"C:\Users\Admin\AppData\Roaming\dew.exe"' & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2804
  - - C:\Windows\SysWOW64\schtasks.exe
      schtasks /create /f /sc onlogon /rl highest /tn "dew" /tr '"C:\Users\Admin\AppData\Roaming\dew.exe"'
      4⤵
      Creates scheduled task(s)
      PID:3820
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp1B9C.tmp.bat""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:416
  - - C:\Windows\SysWOW64\timeout.exe
      timeout 3
      4⤵
      Delays execution with timeout.exe
      PID:852
  - - C:\Users\Admin\AppData\Roaming\dew.exe
      "C:\Users\Admin\AppData\Roaming\dew.exe"
      4⤵
      Executes dropped EXE
      Suspicious use of SetThreadContext
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:744
    - - C:\Users\Admin\AppData\Roaming\dew.exe
        
        "C:\Users\Admin\AppData\Roaming\dew.exe"
        5⤵
        Executes dropped EXE
        
        PID:2476
    - - C:\Users\Admin\AppData\Roaming\dew.exe
        
        "C:\Users\Admin\AppData\Roaming\dew.exe"
        5⤵
        Executes dropped EXE
        
        PID:3328
    - - C:\Users\Admin\AppData\Roaming\dew.exe
        
        "C:\Users\Admin\AppData\Roaming\dew.exe"
        5⤵
        Executes dropped EXE
        Suspicious use of AdjustPrivilegeToken
        
        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

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Downloads

memory/636-121-0x0000000005AD0000-0x0000000005AED000-memory.dmp

Download

memory/636-120-0x0000000005B60000-0x0000000005B61000-memory.dmp

Download

memory/636-116-0x0000000005CE0000-0x0000000005CE1000-memory.dmp

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memory/636-117-0x0000000005890000-0x0000000005891000-memory.dmp

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memory/636-118-0x00000000057E0000-0x0000000005CDE000-memory.dmp

Download

memory/636-123-0x0000000006460000-0x0000000006487000-memory.dmp

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memory/636-122-0x0000000006720000-0x0000000006777000-memory.dmp

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memory/636-114-0x0000000000FD0000-0x0000000000FD1000-memory.dmp

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memory/636-119-0x0000000005A00000-0x0000000005A01000-memory.dmp

Download

memory/744-143-0x0000000005160000-0x000000000565E000-memory.dmp

Download

memory/4020-124-0x0000000000400000-0x0000000000412000-memory.dmp

Download

memory/4020-128-0x0000000005680000-0x0000000005681000-memory.dmp

Download

memory/4084-156-0x00000000055D0000-0x00000000055D1000-memory.dmp

Download