asyncrat | e6d47f48a0ce335565ab3f98b7fcea9b3078e0c8a100f9b85f5c1dd8e5c61647

General

Target

System.exe
Size

47KB
MD5

b54a96fc6a2c782fe559ab2a5a6c926f
SHA1

48ba8ab74fe7e669ef28304852728466b92998c3
SHA256

e6d47f48a0ce335565ab3f98b7fcea9b3078e0c8a100f9b85f5c1dd8e5c61647
SHA512

67a3c71c9ddb6eab42086f5881a2473832762f742cfe5f465a719d4cf69334629ff81797a5a438e74f12abbfd7850c15621919ac7babf3d7b3a357ca86c7531f
SSDEEP

768:8uMBi+TDlxOZvWUjwF8ONmo2qztSZ716XtFOtmY8/LQfPImB1sgV0b66OMUEjKK+:8uMB1TDlssF72B71SO8K4mBGVb66ujak

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

newstartagain.servequake.com:6606

newstartagain.servequake.com:7707

newstartagain.servequake.com:8808

newstartagain50.duckdns.org:6606

newstartagain50.duckdns.org:7707

newstartagain50.duckdns.org:8808

Mutex

Fm255Mv55doc

Attributes

delay
3
install
true
install_file
System.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/0x0009000000023384-11.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-1-5-21-3310979990-555183016-1244931625-1000\Control Panel\International\Geo\Nation	System.exe

Executes dropped EXE 1 IoCs

pid	Process
5056	System.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
3964	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
2436	schtasks.exe

Suspicious behavior: EnumeratesProcesses 19 IoCs

pid	Process
4904	System.exe
4904	System.exe
4904	System.exe
4904	System.exe
4904	System.exe
4904	System.exe
4904	System.exe
4904	System.exe
4904	System.exe
4904	System.exe
4904	System.exe
4904	System.exe
4904	System.exe
4904	System.exe
4904	System.exe
4904	System.exe
4904	System.exe
4904	System.exe
4904	System.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4904	System.exe
Token: SeDebugPrivilege	5056	System.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4904 wrote to memory of 4808	4904	System.exe	83
PID 4904 wrote to memory of 4808	4904	System.exe	83
PID 4904 wrote to memory of 4808	4904	System.exe	83
PID 4904 wrote to memory of 4556	4904	System.exe	85
PID 4904 wrote to memory of 4556	4904	System.exe	85
PID 4904 wrote to memory of 4556	4904	System.exe	85
PID 4556 wrote to memory of 3964	4556	cmd.exe	87
PID 4556 wrote to memory of 3964	4556	cmd.exe	87
PID 4556 wrote to memory of 3964	4556	cmd.exe	87
PID 4808 wrote to memory of 2436	4808	cmd.exe	88
PID 4808 wrote to memory of 2436	4808	cmd.exe	88
PID 4808 wrote to memory of 2436	4808	cmd.exe	88
PID 4556 wrote to memory of 5056	4556	cmd.exe	89
PID 4556 wrote to memory of 5056	4556	cmd.exe	89
PID 4556 wrote to memory of 5056	4556	cmd.exe	89

C:\Users\Admin\AppData\Local\Temp\System.exe
"C:\Users\Admin\AppData\Local\Temp\System.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4904
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "System" /tr '"C:\Users\Admin\AppData\Roaming\System.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4808
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "System" /tr '"C:\Users\Admin\AppData\Roaming\System.exe"'
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2436
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpA662.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4556
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:3964
- - C:\Users\Admin\AppData\Roaming\System.exe
    "C:\Users\Admin\AppData\Roaming\System.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:5056

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

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

Filesize
522B

MD5
acc9090417037dfa2a55b46ed86e32b8

SHA1
53fa6fb25fb3e88c24d2027aca6ae492b2800a4d

SHA256
2412679218bb0a7d05ceee32869bbb223619bde9966c4c460a68304a3367724b

SHA512
d51f7085ec147c708f446b9fb6923cd2fb64596d354ed929e125b30ace57c8cb3217589447a36960e5d3aea87a4e48aaa82c7509eced6d6c2cecd71fcfe3697b

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpA662.tmp.bat

Filesize
150B

MD5
adc6824a4f979d5df668c0778086c7a1

SHA1
d03d469803377a3485af632125229e6e496e6d4f

SHA256
ee1b73db5e6982db98972a6f371956bac01eb3d9fbf7c6ccdcde6d8f29255759

SHA512
01102ac9e6971e433d46306eb58310b1d8d198883145921fd8da0cca5fda84643d1c4c266a3d81ae0ae86b5e97b5a17e300c749b40bd66d5dcee7767eb148473

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

Filesize
47KB

MD5
b54a96fc6a2c782fe559ab2a5a6c926f

SHA1
48ba8ab74fe7e669ef28304852728466b92998c3

SHA256
e6d47f48a0ce335565ab3f98b7fcea9b3078e0c8a100f9b85f5c1dd8e5c61647

SHA512
67a3c71c9ddb6eab42086f5881a2473832762f742cfe5f465a719d4cf69334629ff81797a5a438e74f12abbfd7850c15621919ac7babf3d7b3a357ca86c7531f

Download Submit
memory/4904-0-0x000000007515E000-0x000000007515F000-memory.dmp

Filesize
4KB

Download
memory/4904-1-0x0000000000880000-0x0000000000892000-memory.dmp

Filesize
72KB

Download
memory/4904-2-0x0000000075150000-0x0000000075900000-memory.dmp

Filesize
7.7MB

Download
memory/4904-3-0x0000000005250000-0x00000000052EC000-memory.dmp

Filesize
624KB

Download
memory/4904-9-0x0000000075150000-0x0000000075900000-memory.dmp

Filesize
7.7MB

Download
memory/5056-14-0x00000000750B0000-0x0000000075860000-memory.dmp

Filesize
7.7MB

Download
memory/5056-15-0x0000000005640000-0x0000000005BE4000-memory.dmp

Filesize
5.6MB

Download
memory/5056-16-0x0000000005100000-0x0000000005166000-memory.dmp

Filesize
408KB

Download
memory/5056-17-0x00000000750B0000-0x0000000075860000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads