asyncrat | 40ef79c8a882c52c37063d8bd9614f7b9eeb49fcf171a7956c056ee4dc423522

General

Target

Workv2.sfx.exe
Size

456KB
MD5

148b224cf1c43ddb5a8a3d01bbb31b3a
SHA1

5af9b994fca21996d3393d8a8fb3dd50739d326c
SHA256

40ef79c8a882c52c37063d8bd9614f7b9eeb49fcf171a7956c056ee4dc423522
SHA512

a576df0d65699372f020feafaa7822c7e41a6f174301a190c297d997f35fefd184740a1cc63d38ef01acaa01a5b20f41c09d01aaa4d54d75206254fe7e28abcd
SSDEEP

12288:PyveQB/fTHIGaPkKEYzURNAwbAg8h6cQget9:PuDXTIGaPhEYzUzA0qscQgeH

Score

10^/10

asyncrat work discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Work

C2

127.0.0.1:6606

127.0.0.1:7707

127.0.0.1:8808

999.0.0.2:6606

999.0.0.2:7707

999.0.0.2:8808

Mutex

oz6goIqD8qt9

Attributes

delay
3
install
true
install_file
tmp315C.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

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral1/files/0x000f000000016d3f-4.dat	family_asyncrat

Executes dropped EXE 2 IoCs

pid	Process
2972	Workv2.exe
2852	tmp315C.exe

Loads dropped DLL 1 IoCs

pid	Process
1384	cmd.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	Workv2.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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	tmp315C.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
2728	timeout.exe

Gathers system information 1 TTPs 1 IoCs

Runs systeminfo.exe.

System Information Discovery

T1082

pid	Process
2440	systeminfo.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
2788	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2972	Workv2.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2972	Workv2.exe
Token: SeDebugPrivilege	2852	tmp315C.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 2164 wrote to memory of 2972	2164	Workv2.sfx.exe	29
PID 2164 wrote to memory of 2972	2164	Workv2.sfx.exe	29
PID 2164 wrote to memory of 2972	2164	Workv2.sfx.exe	29
PID 2164 wrote to memory of 2972	2164	Workv2.sfx.exe	29
PID 2972 wrote to memory of 2988	2972	Workv2.exe	30
PID 2972 wrote to memory of 2988	2972	Workv2.exe	30
PID 2972 wrote to memory of 2988	2972	Workv2.exe	30
PID 2972 wrote to memory of 2988	2972	Workv2.exe	30
PID 2972 wrote to memory of 1384	2972	Workv2.exe	32
PID 2972 wrote to memory of 1384	2972	Workv2.exe	32
PID 2972 wrote to memory of 1384	2972	Workv2.exe	32
PID 2972 wrote to memory of 1384	2972	Workv2.exe	32
PID 2988 wrote to memory of 2788	2988	cmd.exe	34
PID 2988 wrote to memory of 2788	2988	cmd.exe	34
PID 2988 wrote to memory of 2788	2988	cmd.exe	34
PID 2988 wrote to memory of 2788	2988	cmd.exe	34
PID 1384 wrote to memory of 2728	1384	cmd.exe	35
PID 1384 wrote to memory of 2728	1384	cmd.exe	35
PID 1384 wrote to memory of 2728	1384	cmd.exe	35
PID 1384 wrote to memory of 2728	1384	cmd.exe	35
PID 1384 wrote to memory of 2852	1384	cmd.exe	36
PID 1384 wrote to memory of 2852	1384	cmd.exe	36
PID 1384 wrote to memory of 2852	1384	cmd.exe	36
PID 1384 wrote to memory of 2852	1384	cmd.exe	36
PID 1276 wrote to memory of 2440	1276	cmd.exe	41
PID 1276 wrote to memory of 2440	1276	cmd.exe	41
PID 1276 wrote to memory of 2440	1276	cmd.exe	41

C:\Users\Admin\AppData\Local\Temp\Workv2.sfx.exe
"C:\Users\Admin\AppData\Local\Temp\Workv2.sfx.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2164
- C:\Users\Admin\AppData\Local\Temp\RarSFX0\Workv2.exe
  "C:\Users\Admin\AppData\Local\Temp\RarSFX0\Workv2.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2972
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "tmp315C" /tr '"C:\Users\Admin\AppData\Roaming\tmp315C.exe"' & exit
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2988
  - - C:\Windows\SysWOW64\schtasks.exe
      schtasks /create /f /sc onlogon /rl highest /tn "tmp315C" /tr '"C:\Users\Admin\AppData\Roaming\tmp315C.exe"'
      4⤵
      System Location Discovery: System Language Discovery
      Scheduled Task/Job: Scheduled Task
      PID:2788
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp1880.tmp.bat""
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:1384
  - - C:\Windows\SysWOW64\timeout.exe
      timeout 3
      4⤵
      System Location Discovery: System Language Discovery
      Delays execution with timeout.exe
      PID:2728
  - - C:\Users\Admin\AppData\Roaming\tmp315C.exe
      "C:\Users\Admin\AppData\Roaming\tmp315C.exe"
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      Suspicious use of AdjustPrivilegeToken
      PID:2852

C:\Windows\system32\cmd.exe
"C:\Windows\system32\cmd.exe"
1⤵
PID:2464

C:\Windows\system32\cmd.exe
"C:\Windows\system32\cmd.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1276
- C:\Windows\system32\systeminfo.exe
  systeminfo
  2⤵
  - Gathers system information
  PID:2440

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

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\RarSFX0\Workv2.exe

Filesize
71KB

MD5
1def2f48782ecc1923dd02c448812ca0

SHA1
d4b993306694cf14e9a8d76d6ef487abf23777f1

SHA256
9ec2a198611952fa252b39416afa05bf61e8f511005a3e61a23d31b8963d4554

SHA512
147b84da67ba11e9ef895d9d48f97ce113d9013f1a49178937bb3ac0f332f52710d50da0fc8dd84d8c0a686012fcc60bf559339e66caa35489b0555c5e00e8f4

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp1880.tmp.bat

Filesize
151B

MD5
420391b4f7246c2d5cce20f3f6766659

SHA1
456f5f0ab9cd32e862dcf4068f3708e4a9739c66

SHA256
ac87027b168040b4cecf05afc76dca39e7d8c3fd218a4094298e0713def494bc

SHA512
973b7c87f1eeb43688830fa83a465dd9977bd208cade6d66a277ed3aacdad36f0effb1af1f691c4584f2b86c648917b2a8621178cc732d25ce2f0f495f54ca18

Download Submit
memory/2852-28-0x0000000000E00000-0x0000000000E18000-memory.dmp

Filesize
96KB

Download
memory/2972-12-0x000000007437E000-0x000000007437F000-memory.dmp

Filesize
4KB

Download
memory/2972-13-0x00000000013E0000-0x00000000013F8000-memory.dmp

Filesize
96KB

Download
memory/2972-14-0x0000000074370000-0x0000000074A5E000-memory.dmp

Filesize
6.9MB

Download
memory/2972-23-0x0000000074370000-0x0000000074A5E000-memory.dmp

Filesize
6.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads