asyncrat | 6a93f241b22b9784403998ec187fcf75ae9dd830aa834b7698052165ef225ec0

General

Target

now.exe
Size

63KB
MD5

742a8c6a17671e7db3e4fa1c15534fb1
SHA1

5f6e4b10c34e512cd1110b6c67b0722d00d5a34d
SHA256

6a93f241b22b9784403998ec187fcf75ae9dd830aa834b7698052165ef225ec0
SHA512

315a99105682595fd8366c3e237e57a187a4902bcf49894a35aa3d5a0cde32d26168a530dc9d9b8d00d27debf2be6f6eadcd1b17ce86c53a1d80c5a711f3d442
SSDEEP

1536:DZmttUdjLAQBae5Q5uEPGbbQwTPVbGBi/J6GVZVclN:DZmttUdjvBF5Qw2GbbQ6dzY

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Version

1.0.7

Botnet

Default

C2

127.0.0.1:8848

127.0.0.1:64431

fojeweb571-64431.portmap.host:8848

fojeweb571-64431.portmap.host:64431

Mutex

DcRatMutex_qwqdanchun

Attributes

delay
1
install
true
install_file
windows defender firewall.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
behavioral1/files/0x0029000000045047-10.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-1-5-21-4074627901-37362009-3519777259-1000\Control Panel\International\Geo\Nation	now.exe

Executes dropped EXE 1 IoCs

pid	Process
1564	windows defender firewall.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
608	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
4712	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
3608	now.exe
3608	now.exe
3608	now.exe
3608	now.exe
3608	now.exe
3608	now.exe
3608	now.exe
3608	now.exe
3608	now.exe
3608	now.exe
3608	now.exe
3608	now.exe
3608	now.exe
3608	now.exe
3608	now.exe
3608	now.exe
3608	now.exe
3608	now.exe
3608	now.exe
3608	now.exe
3608	now.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3608	now.exe
Token: SeDebugPrivilege	1564	windows defender firewall.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 3608 wrote to memory of 5044	3608	now.exe	82
PID 3608 wrote to memory of 5044	3608	now.exe	82
PID 3608 wrote to memory of 3224	3608	now.exe	84
PID 3608 wrote to memory of 3224	3608	now.exe	84
PID 3224 wrote to memory of 608	3224	cmd.exe	87
PID 3224 wrote to memory of 608	3224	cmd.exe	87
PID 5044 wrote to memory of 4712	5044	cmd.exe	86
PID 5044 wrote to memory of 4712	5044	cmd.exe	86
PID 3224 wrote to memory of 1564	3224	cmd.exe	92
PID 3224 wrote to memory of 1564	3224	cmd.exe	92

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\now.exe
"C:\Users\Admin\AppData\Local\Temp\now.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3608
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "windows defender firewall" /tr '"C:\Users\Admin\AppData\Roaming\windows defender firewall.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:5044
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "windows defender firewall" /tr '"C:\Users\Admin\AppData\Roaming\windows defender firewall.exe"'
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4712
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp6B6C.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3224
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:608
- - C:\Users\Admin\AppData\Roaming\windows defender firewall.exe
    "C:\Users\Admin\AppData\Roaming\windows defender firewall.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:1564

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\tmp6B6C.tmp.bat

Filesize
169B

MD5
860ea40a90789f726f643af1ef86f613

SHA1
7484a02258849522fa6633bad0858b88b70d09d7

SHA256
dff485648f0a4f9b2cade5ec470d1e731aa2d95e58aa7d4925b230d9456be9b3

SHA512
2dced3f0cb3ce07c4cae365d60c45ceecbb1b9a86b4dc82cbed79d147daf51e5ca3a8c2961926c7061d207429ac29f622ac4778c296606456d229f04090601b5

Download Submit
C:\Users\Admin\AppData\Roaming\windows defender firewall.exe

Filesize
63KB

MD5
742a8c6a17671e7db3e4fa1c15534fb1

SHA1
5f6e4b10c34e512cd1110b6c67b0722d00d5a34d

SHA256
6a93f241b22b9784403998ec187fcf75ae9dd830aa834b7698052165ef225ec0

SHA512
315a99105682595fd8366c3e237e57a187a4902bcf49894a35aa3d5a0cde32d26168a530dc9d9b8d00d27debf2be6f6eadcd1b17ce86c53a1d80c5a711f3d442

Download Submit
memory/3608-0-0x00007FFB035F3000-0x00007FFB035F5000-memory.dmp

Filesize
8KB

Download
memory/3608-1-0x0000000000480000-0x0000000000496000-memory.dmp

Filesize
88KB

Download
memory/3608-2-0x00007FFB035F0000-0x00007FFB040B2000-memory.dmp

Filesize
10.8MB

Download
memory/3608-3-0x00007FFB035F0000-0x00007FFB040B2000-memory.dmp

Filesize
10.8MB

Download
memory/3608-8-0x00007FFB035F0000-0x00007FFB040B2000-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