asyncrat | 2480869eccd0043d4a39a93fe807e178b5b0b551793407f150b93be7b5c938ea

General

Target
kojiropau.exe
Size 45KB
Sample260530-dwg4ssdx21
SHA256 2480869eccd0043d4a39a93fe807e178b5b0b551793407f150b93be7b5c938ea
MD5 ae69782d0f3022b93f30c9f1b356913b
SHA1 2f11bf4bd5a535f0f15b50d5d9a031d9150aeb20
SHA512 c62168072651a0842b21a6d1510051f32f779ef18d0a158b3cd2b4dc7289445abd9f9fcd4e94ec664df3704a108a54565675defa3276d6bfbea76faee0d343ef
SSDEEP 768:puL8m+TwQhclWUlNzWmo2qD308e9cP0ViDPItzjbWgX3icG3qdUyg+7abIBDZ6x:puLV+Twip2OEriMt3bJXSB3gg+7abud4
TLSH
T1FE231A003BE8812BF2BE5F78A9F26245467AF2772603D5491CC451DB5713BC69A03AFE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

default defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

vnsextop1.com:443
vnsextop1.com:80
rat.vnsextop1.com:443
rat.vnsextop1.com:80

Mutex

tJ1fc03O4q9g

Attributes

delay
3
install
true
install_file
kojiropau.exe
install_folder
%AppData%

aes.plain

Signatures

Family: 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/0x001800000002b750-9.dat	family_asyncrat

Executes dropped EXE 2 IoCs

pid	Process
1688	kojiropau.exe
4344	kojiropau.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	kojiropau.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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	kojiropau.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	kojiropau.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
3316	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
4476	schtasks.exe

Suspicious behavior: EnumeratesProcesses 19 IoCs

pid	Process
5144	kojiropau.exe
5144	kojiropau.exe
5144	kojiropau.exe
5144	kojiropau.exe
5144	kojiropau.exe
5144	kojiropau.exe
5144	kojiropau.exe
5144	kojiropau.exe
5144	kojiropau.exe
5144	kojiropau.exe
5144	kojiropau.exe
5144	kojiropau.exe
5144	kojiropau.exe
5144	kojiropau.exe
5144	kojiropau.exe
5144	kojiropau.exe
5144	kojiropau.exe
5144	kojiropau.exe
5144	kojiropau.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	5144	kojiropau.exe
Token: SeDebugPrivilege	1688	kojiropau.exe
Token: SeDebugPrivilege	1688	kojiropau.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 5144 wrote to memory of 1900	5144	kojiropau.exe	81
PID 5144 wrote to memory of 3652	5144	kojiropau.exe	83
PID 1900 wrote to memory of 4476	1900	cmd.exe	85
PID 3652 wrote to memory of 3316	3652	cmd.exe	86
PID 3652 wrote to memory of 4344	3652	cmd.exe	89

C:\Users\Admin\AppData\Local\Temp\kojiropau.exe
"C:\Users\Admin\AppData\Local\Temp\kojiropau.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5144
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "kojiropau" /tr '"C:\Users\Admin\AppData\Roaming\kojiropau.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1900
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "kojiropau" /tr '"C:\Users\Admin\AppData\Roaming\kojiropau.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4476
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp45AF.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3652
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:3316
- - C:\Users\Admin\AppData\Roaming\kojiropau.exe
    "C:\Users\Admin\AppData\Roaming\kojiropau.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:4344

C:\Users\Admin\AppData\Roaming\kojiropau.exe
"C:\Users\Admin\AppData\Roaming\kojiropau.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:1688

Network

MITRE ATT&CK Enterprise v16

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

kojiropau.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\kojiropau.exe.log
Size 614B
SHA256 93e03593374ce40bc5d4c57832ebe96d3a6a532766eb6385f568a0383b426d10
MD5 fece27917067365b631bc648c66fe066
SHA1 f12c84b1c2b1296091ee06e8654c7065d22cbb44
SHA512 9b502a6d46b82ccc2c8aff650de664299f0131a82480eb9cec701546e9cd7f1647c0665014035c19da80a6cab267cf896645af827ecdd95287a70994c1ecb662
TLSH
T10BF046303231B1D84D123F52181C6A8952EF0786BBB8DF6C7690631EDC36057AB222E3
MD5 SHA1 SHA512 TLSH

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tmp45AF.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp45AF.tmp.bat
Size 153B
SHA256 bc0e1634170ebe40ce0b406658125a80793b8780f2e65a7d2789139b6311beb7
MD5 9c37480724fa38732f698a806a9765c6
SHA1 2e596bb2f175423b8db2b509016a5d3d1f44e52a
SHA512 4026602757f566e4dc1578a16fb6e8833ef1aaff90cc28dc8339969924bf0f8c020ebd9c3d9ec1f7e8d8fac65178c6b17eb192ad96d04ec1cf27dbdecbfcc767
TLSH
T104C02B4351CDEA1E6809742307FAD98C95727C193F80BF00C304C45D5380C48F4DA341
MD5 SHA1 SHA512 TLSH

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kojiropau.exe

Path C:\Users\Admin\AppData\Roaming\kojiropau.exe
Size 45KB
SHA256 2480869eccd0043d4a39a93fe807e178b5b0b551793407f150b93be7b5c938ea
MD5 ae69782d0f3022b93f30c9f1b356913b
SHA1 2f11bf4bd5a535f0f15b50d5d9a031d9150aeb20
SHA512 c62168072651a0842b21a6d1510051f32f779ef18d0a158b3cd2b4dc7289445abd9f9fcd4e94ec664df3704a108a54565675defa3276d6bfbea76faee0d343ef
SSDEEP 768:puL8m+TwQhclWUlNzWmo2qD308e9cP0ViDPItzjbWgX3icG3qdUyg+7abIBDZ6x:puLV+Twip2OEriMt3bJXSB3gg+7abud4
TLSH
T1FE231A003BE8812BF2BE5F78A9F26245467AF2772603D5491CC451DB5713BC69A03AFE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/5144-0-0x00000000009F0000-0x0000000000A02000-memory.dmp

Download

memory/5144-1-0x00000000054A0000-0x00000000054B0000-memory.dmp

Download

memory/5144-2-0x00000000054B0000-0x0000000005516000-memory.dmp

Download

memory/5144-3-0x00000000058E0000-0x000000000597C000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads