asyncrat | 6d52f72d16a4e5057ba82b43278e47b4c44d3d1ec8566681e72bfe21d7e86a63

General

Target

AsyncClient.exe
Size

48KB
MD5

c73e9ac2a8016900540f7e8c076a0c6c
SHA1

a06194d2d31c4092bafe50b7fe034c2df6eeae64
SHA256

6d52f72d16a4e5057ba82b43278e47b4c44d3d1ec8566681e72bfe21d7e86a63
SHA512

a6c92ba547761d28374b56b433fb75bec1e7c12c060c77bcb32b570b3c6a390a0cd12ee7ed66a3cc5f4ea70f20fa85720b082604988b9ddcd7d88f5ee61b7e33
SSDEEP

768:iuUjVTwkbBHWU72ZcFmo2qjuG2aJbnOPI2MgCZDXoN0be7UX+xoLlM6ZmR3i58TP:iuUjVTwA4M2op2MgCXoKbGUXooLl/Z8v

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

Mutex

EsPbolIGiMu1

Attributes

delay
3
install
true
install_file
ratatoulie.exe
install_folder
%AppData%
pastebin_config
https://pastebin.com/raw/hcwJVFkr

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/files/0x000300000001e925-11.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-1-5-21-1161330783-2912525651-1278508834-1000\Control Panel\International\Geo\Nation	AsyncClient.exe

Executes dropped EXE 1 IoCs

pid	Process
556	ratatoulie.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
24	pastebin.com
25	pastebin.com

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	ratatoulie.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncClient.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
5092	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
624	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
4408	AsyncClient.exe
4408	AsyncClient.exe
4408	AsyncClient.exe
4408	AsyncClient.exe
4408	AsyncClient.exe
4408	AsyncClient.exe
4408	AsyncClient.exe
4408	AsyncClient.exe
4408	AsyncClient.exe
4408	AsyncClient.exe
4408	AsyncClient.exe
4408	AsyncClient.exe
4408	AsyncClient.exe
4408	AsyncClient.exe
4408	AsyncClient.exe
4408	AsyncClient.exe
4408	AsyncClient.exe
4408	AsyncClient.exe
4408	AsyncClient.exe
4408	AsyncClient.exe
4408	AsyncClient.exe
4408	AsyncClient.exe
4408	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4408	AsyncClient.exe
Token: SeDebugPrivilege	556	ratatoulie.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4408 wrote to memory of 2940	4408	AsyncClient.exe	91
PID 4408 wrote to memory of 2940	4408	AsyncClient.exe	91
PID 4408 wrote to memory of 2940	4408	AsyncClient.exe	91
PID 4408 wrote to memory of 4872	4408	AsyncClient.exe	93
PID 4408 wrote to memory of 4872	4408	AsyncClient.exe	93
PID 4408 wrote to memory of 4872	4408	AsyncClient.exe	93
PID 2940 wrote to memory of 624	2940	cmd.exe	95
PID 2940 wrote to memory of 624	2940	cmd.exe	95
PID 2940 wrote to memory of 624	2940	cmd.exe	95
PID 4872 wrote to memory of 5092	4872	cmd.exe	96
PID 4872 wrote to memory of 5092	4872	cmd.exe	96
PID 4872 wrote to memory of 5092	4872	cmd.exe	96
PID 4872 wrote to memory of 556	4872	cmd.exe	98
PID 4872 wrote to memory of 556	4872	cmd.exe	98
PID 4872 wrote to memory of 556	4872	cmd.exe	98

C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe
"C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4408
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "ratatoulie" /tr '"C:\Users\Admin\AppData\Roaming\ratatoulie.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2940
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "ratatoulie" /tr '"C:\Users\Admin\AppData\Roaming\ratatoulie.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:624
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpCC29.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4872
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:5092
- - C:\Users\Admin\AppData\Roaming\ratatoulie.exe
    "C:\Users\Admin\AppData\Roaming\ratatoulie.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:556

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

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpCC29.tmp.bat

Filesize
154B

MD5
c9567860e0b3d6cb07a197464ff4b4a0

SHA1
e494a214b6993a05b4191fcabc37fa455285a2eb

SHA256
a63ab7c72f436fefb084b25a220c5aca79d077912a47ccc4106bcaa715d2de23

SHA512
092bff2ab71e0d1432d4261008182d680e38232232fe2d7d3fd8f069961410f5baa0e56c126cd37b91986750bc45cacd9ec08b9a3cd2ab30d6621c593f506fc3

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

Filesize
48KB

MD5
c73e9ac2a8016900540f7e8c076a0c6c

SHA1
a06194d2d31c4092bafe50b7fe034c2df6eeae64

SHA256
6d52f72d16a4e5057ba82b43278e47b4c44d3d1ec8566681e72bfe21d7e86a63

SHA512
a6c92ba547761d28374b56b433fb75bec1e7c12c060c77bcb32b570b3c6a390a0cd12ee7ed66a3cc5f4ea70f20fa85720b082604988b9ddcd7d88f5ee61b7e33

Download Submit
memory/556-13-0x00000000749F0000-0x00000000751A0000-memory.dmp

Filesize
7.7MB

Download
memory/556-14-0x00000000749F0000-0x00000000751A0000-memory.dmp

Filesize
7.7MB

Download
memory/4408-0-0x0000000074AAE000-0x0000000074AAF000-memory.dmp

Filesize
4KB

Download
memory/4408-1-0x00000000005F0000-0x0000000000602000-memory.dmp

Filesize
72KB

Download
memory/4408-2-0x0000000074AA0000-0x0000000075250000-memory.dmp

Filesize
7.7MB

Download
memory/4408-3-0x0000000004FB0000-0x000000000504C000-memory.dmp

Filesize
624KB

Download
memory/4408-8-0x0000000074AA0000-0x0000000075250000-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