asyncrat | 4a5c20288beee4a20187788f64d7086ba7d4a13edc7b48c6b0447ea2c3107a99

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
behavioral2/files/0x0008000000023ca5-21.dat	family_asyncrat

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-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	563dd94590408df258e1b8364870432b47eb85eac99ee57d252114a726c863f3.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	Runtime Broker.exe

Executes dropped EXE 3 IoCs

pid	Process
4612	MiniMailViewer.exe
4824	Runtime Broker.exe
4216	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 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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	MiniMailViewer.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Runtime Broker.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3324	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
1744	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
4824	Runtime Broker.exe
4824	Runtime Broker.exe
4824	Runtime Broker.exe
4824	Runtime Broker.exe
4824	Runtime Broker.exe
4824	Runtime Broker.exe
4824	Runtime Broker.exe
4824	Runtime Broker.exe
4824	Runtime Broker.exe
4824	Runtime Broker.exe
4824	Runtime Broker.exe
4824	Runtime Broker.exe
4824	Runtime Broker.exe
4824	Runtime Broker.exe
4824	Runtime Broker.exe
4824	Runtime Broker.exe
4824	Runtime Broker.exe
4824	Runtime Broker.exe
4824	Runtime Broker.exe
4824	Runtime Broker.exe
4824	Runtime Broker.exe
4824	Runtime Broker.exe
4824	Runtime Broker.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4824	Runtime Broker.exe
Token: SeDebugPrivilege	4216	Runtime Broker.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 2248 wrote to memory of 4612	2248	563dd94590408df258e1b8364870432b47eb85eac99ee57d252114a726c863f3.exe	83
PID 2248 wrote to memory of 4612	2248	563dd94590408df258e1b8364870432b47eb85eac99ee57d252114a726c863f3.exe	83
PID 2248 wrote to memory of 4612	2248	563dd94590408df258e1b8364870432b47eb85eac99ee57d252114a726c863f3.exe	83
PID 2248 wrote to memory of 4824	2248	563dd94590408df258e1b8364870432b47eb85eac99ee57d252114a726c863f3.exe	84
PID 2248 wrote to memory of 4824	2248	563dd94590408df258e1b8364870432b47eb85eac99ee57d252114a726c863f3.exe	84
PID 2248 wrote to memory of 4824	2248	563dd94590408df258e1b8364870432b47eb85eac99ee57d252114a726c863f3.exe	84
PID 4824 wrote to memory of 2452	4824	Runtime Broker.exe	85
PID 4824 wrote to memory of 2452	4824	Runtime Broker.exe	85
PID 4824 wrote to memory of 2452	4824	Runtime Broker.exe	85
PID 4824 wrote to memory of 1600	4824	Runtime Broker.exe	87
PID 4824 wrote to memory of 1600	4824	Runtime Broker.exe	87
PID 4824 wrote to memory of 1600	4824	Runtime Broker.exe	87
PID 2452 wrote to memory of 1744	2452	cmd.exe	89
PID 2452 wrote to memory of 1744	2452	cmd.exe	89
PID 2452 wrote to memory of 1744	2452	cmd.exe	89
PID 1600 wrote to memory of 3324	1600	cmd.exe	90
PID 1600 wrote to memory of 3324	1600	cmd.exe	90
PID 1600 wrote to memory of 3324	1600	cmd.exe	90
PID 1600 wrote to memory of 4216	1600	cmd.exe	97
PID 1600 wrote to memory of 4216	1600	cmd.exe	97
PID 1600 wrote to memory of 4216	1600	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\563dd94590408df258e1b8364870432b47eb85eac99ee57d252114a726c863f3.exe
"C:\Users\Admin\AppData\Local\Temp\563dd94590408df258e1b8364870432b47eb85eac99ee57d252114a726c863f3.exe"
1⤵
- Checks computer location settings
- 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:4612
- C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe
  "C:\Users\Admin\AppData\Local\Temp\Runtime Broker.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:4824
- - 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:2452
  - - 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:1744
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp8A6.tmp.bat""
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:1600
  - - C:\Windows\SysWOW64\timeout.exe
      timeout 3
      4⤵
      System Location Discovery: System Language Discovery
      Delays execution with timeout.exe
      PID:3324
  - - 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:4216

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

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\Runtime Broker.exe.log

Filesize
522B

MD5
acc9090417037dfa2a55b46ed86e32b8

SHA1
53fa6fb25fb3e88c24d2027aca6ae492b2800a4d

SHA256
2412679218bb0a7d05ceee32869bbb223619bde9966c4c460a68304a3367724b

SHA512
d51f7085ec147c708f446b9fb6923cd2fb64596d354ed929e125b30ace57c8cb3217589447a36960e5d3aea87a4e48aaa82c7509eced6d6c2cecd71fcfe3697b

Download Submit
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\tmp8A6.tmp.bat

Filesize
157B

MD5
58b64296c8e168196037d2441e9f41d1

SHA1
fe3385297284291ef444f5b7adb0ad52ad3f756d

SHA256
da1b5bd08baf5fd2bfbc86c2d5cc4caa2f1928f240abd42d2e9e56db1db89b10

SHA512
34036b2c4d9a3435b8a07d128b181009a169b97bd4e2e319753575b64bb69747b975035fd9e5f070c8c3818e34c5eb62468bd4822a3bbda0729a9c2cf7a6247b

Download Submit
memory/2248-33-0x00007FFBBD680000-0x00007FFBBE141000-memory.dmp

Filesize
10.8MB

Download
memory/2248-1-0x0000000000020000-0x0000000000318000-memory.dmp

Filesize
3.0MB

Download
memory/2248-4-0x00007FFBBD680000-0x00007FFBBE141000-memory.dmp

Filesize
10.8MB

Download
memory/2248-0-0x00007FFBBD683000-0x00007FFBBD685000-memory.dmp

Filesize
8KB

Download
memory/4612-41-0x0000000007010000-0x0000000007048000-memory.dmp

Filesize
224KB

Download
memory/4612-40-0x0000000006410000-0x0000000006418000-memory.dmp

Filesize
32KB

Download
memory/4612-55-0x0000000075110000-0x00000000758C0000-memory.dmp

Filesize
7.7MB

Download
memory/4612-35-0x0000000009920000-0x00000000099D8000-memory.dmp

Filesize
736KB

Download
memory/4612-31-0x0000000007850000-0x0000000007922000-memory.dmp

Filesize
840KB

Download
memory/4612-36-0x0000000008920000-0x0000000008ABE000-memory.dmp

Filesize
1.6MB

Download
memory/4612-37-0x00000000075F0000-0x000000000762A000-memory.dmp

Filesize
232KB

Download
memory/4612-38-0x0000000007700000-0x00000000077BA000-memory.dmp

Filesize
744KB

Download
memory/4612-39-0x0000000007650000-0x0000000007678000-memory.dmp

Filesize
160KB

Download
memory/4612-34-0x0000000075110000-0x00000000758C0000-memory.dmp

Filesize
7.7MB

Download
memory/4612-18-0x0000000000700000-0x00000000009DE000-memory.dmp

Filesize
2.9MB

Download
memory/4612-42-0x0000000006FD0000-0x0000000006FDE000-memory.dmp

Filesize
56KB

Download
memory/4612-54-0x000000007511E000-0x000000007511F000-memory.dmp

Filesize
4KB

Download
memory/4612-17-0x000000007511E000-0x000000007511F000-memory.dmp

Filesize
4KB

Download
memory/4824-30-0x00000000005D0000-0x00000000005FA000-memory.dmp

Filesize
168KB

Download
memory/4824-48-0x0000000075110000-0x00000000758C0000-memory.dmp

Filesize
7.7MB

Download
memory/4824-43-0x0000000004EF0000-0x0000000004F8C000-memory.dmp

Filesize
624KB

Download
memory/4824-32-0x0000000075110000-0x00000000758C0000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads