asyncrat | 04105c31ae5c279af8caa8d22410391f0b21b4a6fb426852011932f4f063fe32

General

Target

si.exe
Size

130KB
MD5

c894a24b791013f77cd90631beb2c5ea
SHA1

73ceadbc28aa686461fe3d1afc361a3cb2bee327
SHA256

04105c31ae5c279af8caa8d22410391f0b21b4a6fb426852011932f4f063fe32
SHA512

50f95867e36485c11f45cb86599770296c5431853770be58bc2e3f4961d19a105ea2c8554754bfe2c7768cef7e92c96ae56cfb3e8df650be579e28c39c43185c
SSDEEP

1536:A39qSqQzbdqtnkJLlriMv+vLYq/SWkXftdFXGq0h8v6ZiBPUmZFIOdqDVclN:09qszbdqxm1ihk6kvtfGq0ev3U2WZpY

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Version

1.0.7

Botnet

Default

C2

mcehonline-48303.portmap.io:48303

Mutex

DcRatMutex_qwqdanchun

Attributes

delay
1
install
true
install_file
SearchIndexer.exe
install_folder
%AppData%

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral2/files/0x000b0000000234d4-10.dat	family_asyncrat

Checks computer location settings 2 TTPs 1 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-1-5-21-2636447293-1148739154-93880854-1000\Control Panel\International\Geo\Nation	si.exe

Executes dropped EXE 1 IoCs

pid	Process
2116	SearchIndexer.exe

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

System Information Discovery
T1082

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3972	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
4936	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
2456	si.exe
2456	si.exe
2456	si.exe
2456	si.exe
2456	si.exe
2456	si.exe
2456	si.exe
2456	si.exe
2456	si.exe
2456	si.exe
2456	si.exe
2456	si.exe
2456	si.exe
2456	si.exe
2456	si.exe
2456	si.exe
2456	si.exe
2456	si.exe
2456	si.exe
2456	si.exe
2456	si.exe
2456	si.exe
2456	si.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	2456	si.exe
Token: SeDebugPrivilege	2456	si.exe
Token: SeDebugPrivilege	2116	SearchIndexer.exe
Token: SeDebugPrivilege	2116	SearchIndexer.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2456 wrote to memory of 2504	2456	si.exe	89
PID 2456 wrote to memory of 2504	2456	si.exe	89
PID 2456 wrote to memory of 3860	2456	si.exe	91
PID 2456 wrote to memory of 3860	2456	si.exe	91
PID 3860 wrote to memory of 3972	3860	cmd.exe	93
PID 3860 wrote to memory of 3972	3860	cmd.exe	93
PID 2504 wrote to memory of 4936	2504	cmd.exe	94
PID 2504 wrote to memory of 4936	2504	cmd.exe	94
PID 3860 wrote to memory of 2116	3860	cmd.exe	99
PID 3860 wrote to memory of 2116	3860	cmd.exe	99

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\si.exe
"C:\Users\Admin\AppData\Local\Temp\si.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2456
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "SearchIndexer" /tr '"C:\Users\Admin\AppData\Roaming\SearchIndexer.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2504
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "SearchIndexer" /tr '"C:\Users\Admin\AppData\Roaming\SearchIndexer.exe"'
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4936
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpAFF7.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3860
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:3972
- - C:\Users\Admin\AppData\Roaming\SearchIndexer.exe
    "C:\Users\Admin\AppData\Roaming\SearchIndexer.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:2116

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

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpAFF7.tmp.bat

Filesize
157B

MD5
756f8ba6d8ab04befbf5dafeb5857494

SHA1
d7539b17f2b1396faac50bbca2eb8ca1bc5eaba3

SHA256
3344aa457695bc34371e773571225cfbc9f2062c6e20f357262d0734bb341f2b

SHA512
f2d48274269fda308153045031e8ad66b2571f69032b1d1d5619ca0300e4e9d97c231e361b03313eadb7abbb8901a523b7167d29ea570bd6f168b779664493fc

Download Submit
C:\Users\Admin\AppData\Roaming\SearchIndexer.exe

Filesize
130KB

MD5
c894a24b791013f77cd90631beb2c5ea

SHA1
73ceadbc28aa686461fe3d1afc361a3cb2bee327

SHA256
04105c31ae5c279af8caa8d22410391f0b21b4a6fb426852011932f4f063fe32

SHA512
50f95867e36485c11f45cb86599770296c5431853770be58bc2e3f4961d19a105ea2c8554754bfe2c7768cef7e92c96ae56cfb3e8df650be579e28c39c43185c

Download Submit
memory/2456-0-0x0000000000FC0000-0x0000000000FE6000-memory.dmp

Filesize
152KB

Download
memory/2456-1-0x00007FFEDE3A3000-0x00007FFEDE3A5000-memory.dmp

Filesize
8KB

Download
memory/2456-2-0x00007FFEDE3A0000-0x00007FFEDEE61000-memory.dmp

Filesize
10.8MB

Download
memory/2456-8-0x00007FFEDE3A0000-0x00007FFEDEE61000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads