asyncrat | 4a5c20288beee4a20187788f64d7086ba7d4a13edc7b48c6b0447ea2c3107a99

Analysis

max time kernel
148s
max time network
148s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
24-12-2024 10:25

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General

Target

563dd94590408df258e1b8364870432b47eb85eac99ee57d252114a726c863f3.exe
Size

2.9MB
MD5

cb6633f84d025274ebfba538e8d1c372
SHA1

098dd07b8ec18dbe2b8f957307aa344c690af16d
SHA256

563dd94590408df258e1b8364870432b47eb85eac99ee57d252114a726c863f3
SHA512

c94789933c37c0c2c746b42dae70f0b387e42972b7468c257d58f35327e9e5e46b72fbf893a369cb6cc87de6a88f56307815b1db420959ce4aa65e07aceddb6c
SSDEEP

49152:3secMhf75LxU9wBUcIlKSeY36ZUdEcA5w5FeIY0gHGf8GlFSI4v1YojKr:cDMLEwBUVcx5UGdw5FeI1xf8GTSI4e

Score

10^/10

asyncrat discovery rat

Malware Config

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/0x0031000000018bbf-16.dat	family_asyncrat

Executes dropped EXE 3 IoCs

pid	Process
640	MiniMailViewer.exe
3004	Runtime Broker.exe
1692	Runtime Broker.exe

Loads dropped DLL 1 IoCs

pid	Process
2560	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 7 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	MiniMailViewer.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Runtime Broker.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	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

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2320	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
3048	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
3004	Runtime Broker.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3004	Runtime Broker.exe
Token: SeDebugPrivilege	1692	Runtime Broker.exe

Suspicious use of WriteProcessMemory 28 IoCs

description	pid	Process	procid_target
PID 2248 wrote to memory of 640	2248	563dd94590408df258e1b8364870432b47eb85eac99ee57d252114a726c863f3.exe	30
PID 2248 wrote to memory of 640	2248	563dd94590408df258e1b8364870432b47eb85eac99ee57d252114a726c863f3.exe	30
PID 2248 wrote to memory of 640	2248	563dd94590408df258e1b8364870432b47eb85eac99ee57d252114a726c863f3.exe	30
PID 2248 wrote to memory of 640	2248	563dd94590408df258e1b8364870432b47eb85eac99ee57d252114a726c863f3.exe	30
PID 2248 wrote to memory of 3004	2248	563dd94590408df258e1b8364870432b47eb85eac99ee57d252114a726c863f3.exe	31
PID 2248 wrote to memory of 3004	2248	563dd94590408df258e1b8364870432b47eb85eac99ee57d252114a726c863f3.exe	31
PID 2248 wrote to memory of 3004	2248	563dd94590408df258e1b8364870432b47eb85eac99ee57d252114a726c863f3.exe	31
PID 2248 wrote to memory of 3004	2248	563dd94590408df258e1b8364870432b47eb85eac99ee57d252114a726c863f3.exe	31
PID 3004 wrote to memory of 2820	3004	Runtime Broker.exe	32
PID 3004 wrote to memory of 2820	3004	Runtime Broker.exe	32
PID 3004 wrote to memory of 2820	3004	Runtime Broker.exe	32
PID 3004 wrote to memory of 2820	3004	Runtime Broker.exe	32
PID 3004 wrote to memory of 2560	3004	Runtime Broker.exe	34
PID 3004 wrote to memory of 2560	3004	Runtime Broker.exe	34
PID 3004 wrote to memory of 2560	3004	Runtime Broker.exe	34
PID 3004 wrote to memory of 2560	3004	Runtime Broker.exe	34
PID 2820 wrote to memory of 3048	2820	cmd.exe	36
PID 2820 wrote to memory of 3048	2820	cmd.exe	36
PID 2820 wrote to memory of 3048	2820	cmd.exe	36
PID 2820 wrote to memory of 3048	2820	cmd.exe	36
PID 2560 wrote to memory of 2320	2560	cmd.exe	37
PID 2560 wrote to memory of 2320	2560	cmd.exe	37
PID 2560 wrote to memory of 2320	2560	cmd.exe	37
PID 2560 wrote to memory of 2320	2560	cmd.exe	37
PID 2560 wrote to memory of 1692	2560	cmd.exe	38
PID 2560 wrote to memory of 1692	2560	cmd.exe	38
PID 2560 wrote to memory of 1692	2560	cmd.exe	38
PID 2560 wrote to memory of 1692	2560	cmd.exe	38

C:\Users\Admin\AppData\Local\Temp\563dd94590408df258e1b8364870432b47eb85eac99ee57d252114a726c863f3.exe
"C:\Users\Admin\AppData\Local\Temp\563dd94590408df258e1b8364870432b47eb85eac99ee57d252114a726c863f3.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2248
- C:\Users\Admin\AppData\Local\Temp\MiniMailViewer.exe
  "C:\Users\Admin\AppData\Local\Temp\MiniMailViewer.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  PID:640
- C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe
  "C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3004
- - 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:2820
  - - 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:3048
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp36A.tmp.bat""
    3⤵
    - Loads dropped DLL
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2560
  - - C:\Windows\SysWOW64\timeout.exe
      timeout 3
      4⤵
      System Location Discovery: System Language Discovery
      Delays execution with timeout.exe
      PID:2320
  - - 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:1692

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\MiniMailViewer.exe

Filesize
2.8MB

MD5
9d6468123f22e9622c66eb66e2919ce4

SHA1
8ff50b94f5327c4e246e1d422f18caadc510797a

SHA256
d5a306dafe4778e26be59b37a4146225b6ff91b27ebab60030c44db32d3f4c4d

SHA512
72a220665748b7eae980e5ee813fd033e94e4a384a6f3ad5306a87a341bc91c2954578ddc8e1891299827ec022b518c1ae29c85cf220b7b50421d9fe4a16ede9

Download Submit
C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe

Filesize
145KB

MD5
6b085dea8173ba1ed3f10d003a0866b9

SHA1
2d3ae97f63afb748e1557e90c38e0954a0086431

SHA256
ad2d510414d17508c57bb797de20ec9164cde2a3710b653edf7eb6bd8bf1a1f0

SHA512
83e6c84db37c2de26c6ce0839c8c03a83f831029556c53448d0e8ca006f3258b1de763148abe0f04c5d7b05fb8814f5cfd9d26c036b364c5858f6f2637e90cd5

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp36A.tmp.bat

Filesize
157B

MD5
f46f0141059ddc245aa69f1c4cc1338b

SHA1
90e71f6d5a2ab8997f3d047398fca7fde26836c5

SHA256
08d116ffa152675a5c47dd85f61c1d6f061d9bdbaae18844291e62fc2c2b673d

SHA512
448cb6e0fdb1bb82209f9ae038c16d5a3f7a32a74f70bbf02ace7eefe429ab0384aee3afa64cb6e1b24d9f02ebcbbe3a99507c72a0c5e72f48295a15f02be9ad

Download Submit
memory/640-22-0x00000000094D0000-0x0000000009588000-memory.dmp

Filesize
736KB

Download
memory/640-24-0x00000000009A0000-0x00000000009DA000-memory.dmp

Filesize
232KB

Download
memory/640-42-0x0000000000780000-0x000000000078A000-memory.dmp

Filesize
40KB

Download
memory/640-37-0x00000000744DE000-0x00000000744DF000-memory.dmp

Filesize
4KB

Download
memory/640-26-0x0000000000780000-0x000000000078A000-memory.dmp

Filesize
40KB

Download
memory/640-20-0x0000000000AC0000-0x0000000000D9E000-memory.dmp

Filesize
2.9MB

Download
memory/640-21-0x0000000007120000-0x00000000071F2000-memory.dmp

Filesize
840KB

Download
memory/640-27-0x0000000000780000-0x000000000078A000-memory.dmp

Filesize
40KB

Download
memory/640-23-0x0000000009590000-0x000000000972E000-memory.dmp

Filesize
1.6MB

Download
memory/640-12-0x00000000744DE000-0x00000000744DF000-memory.dmp

Filesize
4KB

Download
memory/640-25-0x00000000009E0000-0x0000000000A08000-memory.dmp

Filesize
160KB

Download
memory/1692-41-0x0000000000D40000-0x0000000000D6A000-memory.dmp

Filesize
168KB

Download
memory/2248-0-0x000007FEF5B13000-0x000007FEF5B14000-memory.dmp

Filesize
4KB

Download
memory/2248-1-0x0000000000990000-0x0000000000C88000-memory.dmp

Filesize
3.0MB

Download
memory/2248-18-0x000007FEF5B10000-0x000007FEF64FC000-memory.dmp

Filesize
9.9MB

Download
memory/2248-4-0x000007FEF5B10000-0x000007FEF64FC000-memory.dmp

Filesize
9.9MB

Download
memory/3004-19-0x00000000002A0000-0x00000000002CA000-memory.dmp

Filesize
168KB

Download