asyncrat | 53b332cfe1c4c44836638f462051a11c4a1ffea657c0fb2395d56bfd1d5ed8ae

General

Target

AsyncClient.exe
Size

45KB
MD5

809b18b79b9518de77d2b7c2953fc52b
SHA1

3eecaed2b3a051b9a25366f8ac3cac8bff9fba2d
SHA256

53b332cfe1c4c44836638f462051a11c4a1ffea657c0fb2395d56bfd1d5ed8ae
SHA512

42a4a3fb24ac5ac28895693269e30f10339668061a396ffc5ce23d0f479b9c600dbf7b417f574c78862f7b2192f9e3a81efd4c98ef8d765689899b55d25c17b0
SSDEEP

768:luI1tT/w70kWUquzumo2qzEKjPGaG6PIyzjbFgX3iMZJcv88PKRzyBDZWx:luI1tT/kW2tKTkDy3bCXSMHsK5MdWx

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

127.0.0.1:6606

127.0.0.1:7707

127.0.0.1:8808

Mutex

VeBGOg1bXU2p

Attributes

delay
3
install
true
install_file
virus.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
behavioral2/files/0x000a000000023b5e-11.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-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	AsyncClient.exe

Executes dropped EXE 3 IoCs

pid	Process
2912	virus.exe
2852	virus.exe
1084	virus.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 8 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	AsyncClient.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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	virus.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	virus.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	virus.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3576	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
2128	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
3496	AsyncClient.exe
3496	AsyncClient.exe
3496	AsyncClient.exe
3496	AsyncClient.exe
3496	AsyncClient.exe
3496	AsyncClient.exe
3496	AsyncClient.exe
3496	AsyncClient.exe
3496	AsyncClient.exe
3496	AsyncClient.exe
3496	AsyncClient.exe
3496	AsyncClient.exe
3496	AsyncClient.exe
3496	AsyncClient.exe
3496	AsyncClient.exe
3496	AsyncClient.exe
3496	AsyncClient.exe
3496	AsyncClient.exe
3496	AsyncClient.exe
3496	AsyncClient.exe
3496	AsyncClient.exe
3496	AsyncClient.exe
3496	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	3496	AsyncClient.exe
Token: SeDebugPrivilege	2912	virus.exe
Token: SeDebugPrivilege	2912	virus.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 3496 wrote to memory of 5032	3496	AsyncClient.exe	84
PID 3496 wrote to memory of 5032	3496	AsyncClient.exe	84
PID 3496 wrote to memory of 5032	3496	AsyncClient.exe	84
PID 3496 wrote to memory of 2080	3496	AsyncClient.exe	86
PID 3496 wrote to memory of 2080	3496	AsyncClient.exe	86
PID 3496 wrote to memory of 2080	3496	AsyncClient.exe	86
PID 2080 wrote to memory of 3576	2080	cmd.exe	88
PID 2080 wrote to memory of 3576	2080	cmd.exe	88
PID 2080 wrote to memory of 3576	2080	cmd.exe	88
PID 5032 wrote to memory of 2128	5032	cmd.exe	89
PID 5032 wrote to memory of 2128	5032	cmd.exe	89
PID 5032 wrote to memory of 2128	5032	cmd.exe	89
PID 2080 wrote to memory of 2912	2080	cmd.exe	94
PID 2080 wrote to memory of 2912	2080	cmd.exe	94
PID 2080 wrote to memory of 2912	2080	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe
"C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3496
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "virus" /tr '"C:\Users\Admin\AppData\Roaming\virus.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5032
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "virus" /tr '"C:\Users\Admin\AppData\Roaming\virus.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2128
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp7BB8.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2080
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:3576
- - C:\Users\Admin\AppData\Roaming\virus.exe
    "C:\Users\Admin\AppData\Roaming\virus.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2912

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:3784

C:\Users\Admin\AppData\Roaming\virus.exe
"C:\Users\Admin\AppData\Roaming\virus.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
PID:2852

C:\Users\Admin\AppData\Roaming\virus.exe
"C:\Users\Admin\AppData\Roaming\virus.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
PID:1084

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

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Downloads

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

Filesize
425B

MD5
4eaca4566b22b01cd3bc115b9b0b2196

SHA1
e743e0792c19f71740416e7b3c061d9f1336bf94

SHA256
34ba0ab8d1850e7825763f413142a333ccbc05fa2b5499a28a7d27b8a1c5b4bb

SHA512
bc2b1bf45203e3bb3009a7d37617b8f0f7ffa613680b32de2b963e39d2cf1650614d7035a0cf78f35a4f5cb17a2a439e2e07deaefd2a4275a62efd0a5c0184a1

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp7BB8.tmp.bat

Filesize
149B

MD5
78b45fb0d58a4b9d40ee0ab47e1e4400

SHA1
1c488d2f0dcbdc7de4454d18f7838d5f4bebe2fb

SHA256
c954a6a469f77c5dd8f39bf0057099470f025707590ac97f201058b48d8c2f59

SHA512
0182ca7f21148f05dc64c103dd3c675cd128b09e2b50563996977d1159da0248631efea258e4f9e97e68d16bc963b4f59b6cecc04f85d48e30968879dc3b8111

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

Filesize
45KB

MD5
809b18b79b9518de77d2b7c2953fc52b

SHA1
3eecaed2b3a051b9a25366f8ac3cac8bff9fba2d

SHA256
53b332cfe1c4c44836638f462051a11c4a1ffea657c0fb2395d56bfd1d5ed8ae

SHA512
42a4a3fb24ac5ac28895693269e30f10339668061a396ffc5ce23d0f479b9c600dbf7b417f574c78862f7b2192f9e3a81efd4c98ef8d765689899b55d25c17b0

Download Submit
memory/2912-13-0x00000000748D0000-0x0000000075080000-memory.dmp

Filesize
7.7MB

Download
memory/2912-14-0x00000000748D0000-0x0000000075080000-memory.dmp

Filesize
7.7MB

Download
memory/3496-0-0x000000007498E000-0x000000007498F000-memory.dmp

Filesize
4KB

Download
memory/3496-1-0x0000000000F50000-0x0000000000F62000-memory.dmp

Filesize
72KB

Download
memory/3496-2-0x0000000074980000-0x0000000075130000-memory.dmp

Filesize
7.7MB

Download
memory/3496-3-0x0000000005800000-0x000000000589C000-memory.dmp

Filesize
624KB

Download
memory/3496-8-0x0000000074980000-0x0000000075130000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads