asyncrat | 4d8c876b969caf2449f169f89ec257f5e1412e23b609ab4f7c7ee72cd4b0de60

General

Target

RuntimeBroker.exe
Size

45KB
MD5

7a984e3a8ef99e429ceef1f1ddc144f4
SHA1

581dd32af3c53b1dc7b8a95aa2805ee0e8f44190
SHA256

4d8c876b969caf2449f169f89ec257f5e1412e23b609ab4f7c7ee72cd4b0de60
SHA512

b078b827e49cddfd743dd55802c0a48dc5056ccb172cb83a65e484a26c62fa30e1fa6860621752d4adbad3e5d234d759c817a0c0b3532531a99f50f05622bf6a
SSDEEP

768:ruGr1TVhfPNWUtWuHmo2qzVh7N78wJuPIozjbNVgXKDi4Rj6nKBDZjx:ruGr1TVxx2GFN4iXo3bsXjCj6nUdjx

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

holefo2785-22820.portmap.host:22820

holefo2785-22820.portmap.host:6606

Mutex

I674w9YbNo4n

Attributes

delay
3
install
true
install_file
RuntimeBroker.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/0x000d00000001202b-13.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2924	RuntimeBroker.exe

Loads dropped DLL 1 IoCs

pid	Process
2136	cmd.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	RuntimeBroker.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RuntimeBroker.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
2480	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
2200	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2600	RuntimeBroker.exe
2600	RuntimeBroker.exe
2600	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2600	RuntimeBroker.exe
Token: SeDebugPrivilege	2924	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 2600 wrote to memory of 2004	2600	RuntimeBroker.exe	30
PID 2600 wrote to memory of 2004	2600	RuntimeBroker.exe	30
PID 2600 wrote to memory of 2004	2600	RuntimeBroker.exe	30
PID 2600 wrote to memory of 2004	2600	RuntimeBroker.exe	30
PID 2600 wrote to memory of 2136	2600	RuntimeBroker.exe	32
PID 2600 wrote to memory of 2136	2600	RuntimeBroker.exe	32
PID 2600 wrote to memory of 2136	2600	RuntimeBroker.exe	32
PID 2600 wrote to memory of 2136	2600	RuntimeBroker.exe	32
PID 2004 wrote to memory of 2200	2004	cmd.exe	34
PID 2004 wrote to memory of 2200	2004	cmd.exe	34
PID 2004 wrote to memory of 2200	2004	cmd.exe	34
PID 2004 wrote to memory of 2200	2004	cmd.exe	34
PID 2136 wrote to memory of 2480	2136	cmd.exe	35
PID 2136 wrote to memory of 2480	2136	cmd.exe	35
PID 2136 wrote to memory of 2480	2136	cmd.exe	35
PID 2136 wrote to memory of 2480	2136	cmd.exe	35
PID 2136 wrote to memory of 2924	2136	cmd.exe	36
PID 2136 wrote to memory of 2924	2136	cmd.exe	36
PID 2136 wrote to memory of 2924	2136	cmd.exe	36
PID 2136 wrote to memory of 2924	2136	cmd.exe	36

C:\Users\Admin\AppData\Local\Temp\RuntimeBroker.exe
"C:\Users\Admin\AppData\Local\Temp\RuntimeBroker.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2600
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "RuntimeBroker" /tr '"C:\Users\Admin\AppData\Roaming\RuntimeBroker.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2004
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "RuntimeBroker" /tr '"C:\Users\Admin\AppData\Roaming\RuntimeBroker.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2200
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpA2B5.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2136
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2480
- - C:\Users\Admin\AppData\Roaming\RuntimeBroker.exe
    "C:\Users\Admin\AppData\Roaming\RuntimeBroker.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2924

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

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

C:\Users\Admin\AppData\Local\Temp\tmpA2B5.tmp.bat

Filesize
157B

MD5
1d34828c3838ccf3a64fe4394d178d1b

SHA1
6baacd29dd7d4f3507a37f62d78f17429bbfa048

SHA256
33574b6882db55d30a44cb86f852c74a08fe6d500b6c7f65bb6f269c1d178b27

SHA512
42d4c45915ac8316cc5025a541c5c53495165762e1946ca626ec9d6cb2aafc5db54d3a274e207ccff03565fd34ca97fb4545baa38c62413b7e447110e15fe9ea

Download Submit
\Users\Admin\AppData\Roaming\RuntimeBroker.exe

Filesize
45KB

MD5
7a984e3a8ef99e429ceef1f1ddc144f4

SHA1
581dd32af3c53b1dc7b8a95aa2805ee0e8f44190

SHA256
4d8c876b969caf2449f169f89ec257f5e1412e23b609ab4f7c7ee72cd4b0de60

SHA512
b078b827e49cddfd743dd55802c0a48dc5056ccb172cb83a65e484a26c62fa30e1fa6860621752d4adbad3e5d234d759c817a0c0b3532531a99f50f05622bf6a

Download Submit
memory/2600-0-0x00000000741FE000-0x00000000741FF000-memory.dmp

Filesize
4KB

Download
memory/2600-1-0x0000000001360000-0x0000000001372000-memory.dmp

Filesize
72KB

Download
memory/2600-2-0x00000000741F0000-0x00000000748DE000-memory.dmp

Filesize
6.9MB

Download
memory/2600-11-0x00000000741F0000-0x00000000748DE000-memory.dmp

Filesize
6.9MB

Download
memory/2924-16-0x0000000000C30000-0x0000000000C42000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads