asyncrat | 99a06d8a9eda7ba2d19da54c2759a783e20922a73a4893caccc220cdaa27a883

General

Target

99a06d8a9eda7ba2d19da54c2759a783e20922a73a4893caccc220cdaa27a883.exe
Size

312KB
MD5

520e6035e15a9422e1c4cbada69263aa
SHA1

96915e5d6adf90533c2309c84e226598773d83ec
SHA256

99a06d8a9eda7ba2d19da54c2759a783e20922a73a4893caccc220cdaa27a883
SHA512

ffcf1ff0d9161bdc9c1bbdedc66bccb8bcf74874d25ff4f4436c57aa417160c55914ccb9cb97645c728dd4d230908f707733c30c53faeb0bbfd71e6306999b3b
SSDEEP

6144:Eu6ABA0Krb3LVhA+EWHYSS66Wy6666D6b6666H666K666Z2v666y7N6oZCGEB6ax:EwKXRlYSS66Wy6666D6b6666H666K666

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

C2

18.141.204.5:80

Mutex

AsyncMutex_6SI8OkPnk

Attributes

delay
3
install
true
install_file
syteam.exe
install_folder
%Temp%

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
behavioral1/files/0x000a0000000120d6-13.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2680	syteam.exe

Loads dropped DLL 1 IoCs

pid	Process
2936	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 6 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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	syteam.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	99a06d8a9eda7ba2d19da54c2759a783e20922a73a4893caccc220cdaa27a883.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2916	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
2596	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2676	99a06d8a9eda7ba2d19da54c2759a783e20922a73a4893caccc220cdaa27a883.exe
2676	99a06d8a9eda7ba2d19da54c2759a783e20922a73a4893caccc220cdaa27a883.exe
2676	99a06d8a9eda7ba2d19da54c2759a783e20922a73a4893caccc220cdaa27a883.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2676	99a06d8a9eda7ba2d19da54c2759a783e20922a73a4893caccc220cdaa27a883.exe
Token: SeDebugPrivilege	2680	syteam.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 2676 wrote to memory of 2724	2676	99a06d8a9eda7ba2d19da54c2759a783e20922a73a4893caccc220cdaa27a883.exe	30
PID 2676 wrote to memory of 2724	2676	99a06d8a9eda7ba2d19da54c2759a783e20922a73a4893caccc220cdaa27a883.exe	30
PID 2676 wrote to memory of 2724	2676	99a06d8a9eda7ba2d19da54c2759a783e20922a73a4893caccc220cdaa27a883.exe	30
PID 2676 wrote to memory of 2724	2676	99a06d8a9eda7ba2d19da54c2759a783e20922a73a4893caccc220cdaa27a883.exe	30
PID 2676 wrote to memory of 2936	2676	99a06d8a9eda7ba2d19da54c2759a783e20922a73a4893caccc220cdaa27a883.exe	32
PID 2676 wrote to memory of 2936	2676	99a06d8a9eda7ba2d19da54c2759a783e20922a73a4893caccc220cdaa27a883.exe	32
PID 2676 wrote to memory of 2936	2676	99a06d8a9eda7ba2d19da54c2759a783e20922a73a4893caccc220cdaa27a883.exe	32
PID 2676 wrote to memory of 2936	2676	99a06d8a9eda7ba2d19da54c2759a783e20922a73a4893caccc220cdaa27a883.exe	32
PID 2724 wrote to memory of 2596	2724	cmd.exe	34
PID 2724 wrote to memory of 2596	2724	cmd.exe	34
PID 2724 wrote to memory of 2596	2724	cmd.exe	34
PID 2724 wrote to memory of 2596	2724	cmd.exe	34
PID 2936 wrote to memory of 2916	2936	cmd.exe	35
PID 2936 wrote to memory of 2916	2936	cmd.exe	35
PID 2936 wrote to memory of 2916	2936	cmd.exe	35
PID 2936 wrote to memory of 2916	2936	cmd.exe	35
PID 2936 wrote to memory of 2680	2936	cmd.exe	36
PID 2936 wrote to memory of 2680	2936	cmd.exe	36
PID 2936 wrote to memory of 2680	2936	cmd.exe	36
PID 2936 wrote to memory of 2680	2936	cmd.exe	36

C:\Users\Admin\AppData\Local\Temp\99a06d8a9eda7ba2d19da54c2759a783e20922a73a4893caccc220cdaa27a883.exe
"C:\Users\Admin\AppData\Local\Temp\99a06d8a9eda7ba2d19da54c2759a783e20922a73a4893caccc220cdaa27a883.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2676
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "syteam" /tr '"C:\Users\Admin\AppData\Local\Temp\syteam.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2724
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "syteam" /tr '"C:\Users\Admin\AppData\Local\Temp\syteam.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2596
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp3C64.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2936
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2916
- - C:\Users\Admin\AppData\Local\Temp\syteam.exe
    "C:\Users\Admin\AppData\Local\Temp\syteam.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2680

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

System Information Discovery

1

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\Temp\tmp3C64.tmp.bat

Filesize
153B

MD5
a2e9a0966aebfa0575c51bc43bcbcaa7

SHA1
cd00148fe40675b0b35a0111ed0eda62c3378332

SHA256
5198909ec5b8fcea63082e556c522e261f7e47db8f84816ebe85316b1ce56b38

SHA512
e5b1528b9dbae13718a4fc121073ccc674448f52a315a721a240b43e8f3c75c34516ff18d64bae7a4165e301200d74d1f7aef7f859b2b379b0c741f75e00167d

Download Submit
\Users\Admin\AppData\Local\Temp\syteam.exe

Filesize
312KB

MD5
520e6035e15a9422e1c4cbada69263aa

SHA1
96915e5d6adf90533c2309c84e226598773d83ec

SHA256
99a06d8a9eda7ba2d19da54c2759a783e20922a73a4893caccc220cdaa27a883

SHA512
ffcf1ff0d9161bdc9c1bbdedc66bccb8bcf74874d25ff4f4436c57aa417160c55914ccb9cb97645c728dd4d230908f707733c30c53faeb0bbfd71e6306999b3b

Download Submit
memory/2676-0-0x0000000074C5E000-0x0000000074C5F000-memory.dmp

Filesize
4KB

Download
memory/2676-1-0x0000000000A90000-0x0000000000AE4000-memory.dmp

Filesize
336KB

Download
memory/2676-2-0x0000000074C50000-0x000000007533E000-memory.dmp

Filesize
6.9MB

Download
memory/2676-11-0x0000000074C50000-0x000000007533E000-memory.dmp

Filesize
6.9MB

Download
memory/2680-16-0x0000000000F20000-0x0000000000F74000-memory.dmp

Filesize
336KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads