asyncrat | 71c71f532a866536e7adb19d12996c2d088d38377b53d5cce792b6d416fee4a1

General

Target

Api-Updater.exe
Size

211KB
MD5

c0094906b0e860b9df8aff26b335c308
SHA1

45e1941e2e0bb66b3701be26a8652c84604bfb7d
SHA256

71c71f532a866536e7adb19d12996c2d088d38377b53d5cce792b6d416fee4a1
SHA512

2af5f9d5535488b30ca51a9d01f4ef765c0be33075f2b6312c740c60de2746347ab7a6fc12f39f4dfc1594879d08298f6a9ea7d57740fc1738f426c36b03f855
SSDEEP

3072:xejqKOjH8TJ1P/4a+YKngaulnClmWVw1n3JDcv9ANoGCrI/dSEj7ObfREj8blPsg:xyOj234EFd3iLbmSy7OLREQblP

Score

10^/10

asyncrat execution persistence 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 2 IoCs

rat

resource	yara_rule
behavioral1/memory/1372-24-0x000000001AB10000-0x000000001AB46000-memory.dmp	family_asyncrat
behavioral1/memory/1372-25-0x000000001AB40000-0x000000001AB72000-memory.dmp	family_asyncrat

Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
1044	powershell.exe
2088	powershell.exe
2920	powershell.exe

Executes dropped EXE 2 IoCs

pid	Process
2524	Api-Updater.exe
2876	Api-Updater.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1163522206-1469769407-485553996-1000\Software\Microsoft\Windows\CurrentVersion\Run\GsjJjnxnnax	Api-Updater.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
4	ip-api.com

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

System Information Discovery
T1082

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
2536	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2088	powershell.exe
2920	powershell.exe
1044	powershell.exe
1372	Api-Updater.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	1372	Api-Updater.exe
Token: SeDebugPrivilege	2088	powershell.exe
Token: SeDebugPrivilege	2920	powershell.exe
Token: SeDebugPrivilege	1044	powershell.exe
Token: SeDebugPrivilege	2524	Api-Updater.exe
Token: SeDebugPrivilege	2876	Api-Updater.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1372	Api-Updater.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 1372 wrote to memory of 2088	1372	Api-Updater.exe	31
PID 1372 wrote to memory of 2088	1372	Api-Updater.exe	31
PID 1372 wrote to memory of 2088	1372	Api-Updater.exe	31
PID 1372 wrote to memory of 2920	1372	Api-Updater.exe	33
PID 1372 wrote to memory of 2920	1372	Api-Updater.exe	33
PID 1372 wrote to memory of 2920	1372	Api-Updater.exe	33
PID 1372 wrote to memory of 1044	1372	Api-Updater.exe	35
PID 1372 wrote to memory of 1044	1372	Api-Updater.exe	35
PID 1372 wrote to memory of 1044	1372	Api-Updater.exe	35
PID 1372 wrote to memory of 2536	1372	Api-Updater.exe	38
PID 1372 wrote to memory of 2536	1372	Api-Updater.exe	38
PID 1372 wrote to memory of 2536	1372	Api-Updater.exe	38
PID 1360 wrote to memory of 2524	1360	taskeng.exe	41
PID 1360 wrote to memory of 2524	1360	taskeng.exe	41
PID 1360 wrote to memory of 2524	1360	taskeng.exe	41
PID 1360 wrote to memory of 2876	1360	taskeng.exe	42
PID 1360 wrote to memory of 2876	1360	taskeng.exe	42
PID 1360 wrote to memory of 2876	1360	taskeng.exe	42

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\Api-Updater.exe
"C:\Users\Admin\AppData\Local\Temp\Api-Updater.exe"
1⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1372
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Api-Updater.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2088
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\Api-Updater.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2920
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\ProgramData\Api-Updater.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1044
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /sc minute /mo 1 /rl highest /tn "Api-Updater" /tr "C:\ProgramData\Api-Updater.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2536

C:\Windows\system32\taskeng.exe
taskeng.exe {15D6E47B-F3D5-4EB9-B4EA-658912839965} S-1-5-21-1163522206-1469769407-485553996-1000:PJCSDMRP\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:1360
- C:\ProgramData\Api-Updater.exe
  C:\ProgramData\Api-Updater.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2524
- C:\ProgramData\Api-Updater.exe
  C:\ProgramData\Api-Updater.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2876

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\ProgramData\Api-Updater.exe

Filesize
211KB

MD5
c0094906b0e860b9df8aff26b335c308

SHA1
45e1941e2e0bb66b3701be26a8652c84604bfb7d

SHA256
71c71f532a866536e7adb19d12996c2d088d38377b53d5cce792b6d416fee4a1

SHA512
2af5f9d5535488b30ca51a9d01f4ef765c0be33075f2b6312c740c60de2746347ab7a6fc12f39f4dfc1594879d08298f6a9ea7d57740fc1738f426c36b03f855

Download Submit
C:\Users\Admin\AppData\Local\Temp\CabE977.tmp

Filesize
70KB

MD5
49aebf8cbd62d92ac215b2923fb1b9f5

SHA1
1723be06719828dda65ad804298d0431f6aff976

SHA256
b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

SHA512
bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
1e29cff330388b98a6cdd39a02cca34b

SHA1
4fee3fec34af1c75920a832def0da1dc2233849c

SHA256
56a793eba19ac6d4cf1928ab50722443e84ddf4344ea6e1f62c00f5f2e128ef1

SHA512
b41ec8095eefd99f14d7280232f3afc038981160b3982aeaa3a87e5bbd7e49a7949186e5bebd083258ebcf3146bffc2fccabb308f8b06e05c6feb3282a5d6156

Download Submit
memory/1372-25-0x000000001AB40000-0x000000001AB72000-memory.dmp

Filesize
200KB

Download
memory/1372-1-0x0000000000390000-0x00000000003CC000-memory.dmp

Filesize
240KB

Download
memory/1372-2-0x000007FEF5FD0000-0x000007FEF69BC000-memory.dmp

Filesize
9.9MB

Download
memory/1372-0-0x000007FEF5FD3000-0x000007FEF5FD4000-memory.dmp

Filesize
4KB

Download
memory/1372-27-0x000007FEF5FD0000-0x000007FEF69BC000-memory.dmp

Filesize
9.9MB

Download
memory/1372-26-0x000007FEF5FD3000-0x000007FEF5FD4000-memory.dmp

Filesize
4KB

Download
memory/1372-24-0x000000001AB10000-0x000000001AB46000-memory.dmp

Filesize
216KB

Download
memory/2088-8-0x000000001B730000-0x000000001BA12000-memory.dmp

Filesize
2.9MB

Download
memory/2088-9-0x0000000001D70000-0x0000000001D78000-memory.dmp

Filesize
32KB

Download
memory/2088-7-0x0000000002AD0000-0x0000000002B50000-memory.dmp

Filesize
512KB

Download
memory/2524-47-0x0000000000860000-0x000000000089C000-memory.dmp

Filesize
240KB

Download
memory/2876-50-0x0000000000D40000-0x0000000000D7C000-memory.dmp

Filesize
240KB

Download
memory/2920-16-0x0000000001EF0000-0x0000000001EF8000-memory.dmp

Filesize
32KB

Download
memory/2920-15-0x000000001B710000-0x000000001B9F2000-memory.dmp

Filesize
2.9MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads