asyncrat | 136ed00b06adbf6e557472a882a0f10bbd07d9d5ed19ff285d0a475f0786084a

General

Target

flash/flash.exe
Size

450KB
MD5

669a5b5d993f472a4ab68e4405649fde
SHA1

56332c906d54312d99e71c649cbd7fe1e0639c83
SHA256

29372ef20086423e80fecb84a9ad7980f781433772c6d05f3134037ab819badc
SHA512

46012e73b835372c0c9f424c8afeb8cf2b29a8c03023d6265534da55f310c2cdd682590deafe065430980d9608733db5da65f59d7dc650f7347408b31a8e7ae8
SSDEEP

12288:Ih1Lk70TnvjcbqPOdpMFgclmThae2zsWFBjlSc+n:Uk70Trce2d4JKUsWLlP6

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

Link-Quit

Botnet

Default

C2

info.ctxcel.com:443

Mutex

DcRatMutex_qwqdanchun

Attributes

delay
1
install
true
install_file
server.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/memory/324-16-0x0000000004D20000-0x0000000004D36000-memory.dmp	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-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	flash.exe

Executes dropped EXE 1 IoCs

pid	Process
1968	server.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	server.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	flash.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
628	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
4512	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
324	flash.exe
324	flash.exe
324	flash.exe
324	flash.exe
324	flash.exe
324	flash.exe
324	flash.exe
324	flash.exe
324	flash.exe
324	flash.exe
324	flash.exe
324	flash.exe
324	flash.exe
324	flash.exe
324	flash.exe
324	flash.exe
324	flash.exe
324	flash.exe
324	flash.exe
324	flash.exe
324	flash.exe
324	flash.exe
324	flash.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	324	flash.exe
Token: SeDebugPrivilege	324	flash.exe
Token: SeDebugPrivilege	1968	server.exe
Token: SeDebugPrivilege	1968	server.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 324 wrote to memory of 4216	324	flash.exe	82
PID 324 wrote to memory of 4216	324	flash.exe	82
PID 324 wrote to memory of 4216	324	flash.exe	82
PID 324 wrote to memory of 2680	324	flash.exe	84
PID 324 wrote to memory of 2680	324	flash.exe	84
PID 324 wrote to memory of 2680	324	flash.exe	84
PID 2680 wrote to memory of 628	2680	cmd.exe	86
PID 2680 wrote to memory of 628	2680	cmd.exe	86
PID 2680 wrote to memory of 628	2680	cmd.exe	86
PID 4216 wrote to memory of 4512	4216	cmd.exe	87
PID 4216 wrote to memory of 4512	4216	cmd.exe	87
PID 4216 wrote to memory of 4512	4216	cmd.exe	87
PID 2680 wrote to memory of 1968	2680	cmd.exe	88
PID 2680 wrote to memory of 1968	2680	cmd.exe	88
PID 2680 wrote to memory of 1968	2680	cmd.exe	88

C:\Users\Admin\AppData\Local\Temp\flash\flash.exe
"C:\Users\Admin\AppData\Local\Temp\flash\flash.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:324
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "server" /tr '"C:\Users\Admin\AppData\Roaming\server.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4216
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "server" /tr '"C:\Users\Admin\AppData\Roaming\server.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4512
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp6AC0.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2680
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:628
- - C:\Users\Admin\AppData\Roaming\server.exe
    "C:\Users\Admin\AppData\Roaming\server.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:1968

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\Temp\tmp6AC0.tmp.bat

Filesize
150B

MD5
636b72d03dbe7fb6595a3ef7dcf73fed

SHA1
72a1ec90b4b8bf4a7a62a6c3cf89b4dd6ac23b4b

SHA256
6d78b60dab560c6cd609e27a570c2193374906eb1dfd96b18e7d4d2291fd5f25

SHA512
9bb79752c93df68e9320d25834f818c68cf8cedbf4503501aaf36b10855b3e1b92b96a9bb83bef2aabbbd4e62f89b4cd6dd6216335ef35260b7589885a553093

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

Filesize
450KB

MD5
669a5b5d993f472a4ab68e4405649fde

SHA1
56332c906d54312d99e71c649cbd7fe1e0639c83

SHA256
29372ef20086423e80fecb84a9ad7980f781433772c6d05f3134037ab819badc

SHA512
46012e73b835372c0c9f424c8afeb8cf2b29a8c03023d6265534da55f310c2cdd682590deafe065430980d9608733db5da65f59d7dc650f7347408b31a8e7ae8

Download Submit
memory/324-17-0x0000000075130000-0x00000000758E0000-memory.dmp

Filesize
7.7MB

Download
memory/324-4-0x0000000002660000-0x00000000026C0000-memory.dmp

Filesize
384KB

Download
memory/324-18-0x0000000075130000-0x00000000758E0000-memory.dmp

Filesize
7.7MB

Download
memory/324-23-0x0000000075130000-0x00000000758E0000-memory.dmp

Filesize
7.7MB

Download
memory/324-9-0x0000000002660000-0x00000000026B8000-memory.dmp

Filesize
352KB

Download
memory/324-14-0x0000000075130000-0x00000000758E0000-memory.dmp

Filesize
7.7MB

Download
memory/324-13-0x0000000002660000-0x00000000026B8000-memory.dmp

Filesize
352KB

Download
memory/324-11-0x0000000002660000-0x00000000026B8000-memory.dmp

Filesize
352KB

Download
memory/324-15-0x0000000075130000-0x00000000758E0000-memory.dmp

Filesize
7.7MB

Download
memory/324-7-0x0000000002660000-0x00000000026B8000-memory.dmp

Filesize
352KB

Download
memory/324-6-0x0000000002660000-0x00000000026B8000-memory.dmp

Filesize
352KB

Download
memory/324-16-0x0000000004D20000-0x0000000004D36000-memory.dmp

Filesize
88KB

Download
memory/324-0-0x000000007513E000-0x000000007513F000-memory.dmp

Filesize
4KB

Download
memory/324-2-0x0000000075130000-0x00000000758E0000-memory.dmp

Filesize
7.7MB

Download
memory/324-5-0x0000000075130000-0x00000000758E0000-memory.dmp

Filesize
7.7MB

Download
memory/324-3-0x0000000004DA0000-0x0000000005344000-memory.dmp

Filesize
5.6MB

Download
memory/324-1-0x0000000002480000-0x00000000024E0000-memory.dmp

Filesize
384KB

Download
memory/1968-28-0x0000000075130000-0x00000000758E0000-memory.dmp

Filesize
7.7MB

Download
memory/1968-29-0x0000000075130000-0x00000000758E0000-memory.dmp

Filesize
7.7MB

Download
memory/1968-39-0x0000000075130000-0x00000000758E0000-memory.dmp

Filesize
7.7MB

Download
memory/1968-38-0x0000000075130000-0x00000000758E0000-memory.dmp

Filesize
7.7MB

Download
memory/1968-40-0x0000000075130000-0x00000000758E0000-memory.dmp

Filesize
7.7MB

Download
memory/1968-41-0x0000000075130000-0x00000000758E0000-memory.dmp

Filesize
7.7MB

Download
memory/1968-42-0x0000000075130000-0x00000000758E0000-memory.dmp

Filesize
7.7MB

Download
memory/1968-43-0x0000000075130000-0x00000000758E0000-memory.dmp

Filesize
7.7MB

Download
memory/1968-44-0x0000000075130000-0x00000000758E0000-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