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/0x001a00000002b1ed-9.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
4232	RuntimeBroker.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 10 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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RuntimeBroker.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 2 IoCs

defense_evasion

pid	Process
3784	timeout.exe
3428	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
5480	schtasks.exe

Suspicious behavior: EnumeratesProcesses 17 IoCs

pid	Process
2076	RuntimeBroker.exe
2076	RuntimeBroker.exe
2076	RuntimeBroker.exe
2076	RuntimeBroker.exe
2076	RuntimeBroker.exe
2076	RuntimeBroker.exe
2076	RuntimeBroker.exe
2076	RuntimeBroker.exe
2076	RuntimeBroker.exe
2076	RuntimeBroker.exe
2076	RuntimeBroker.exe
2076	RuntimeBroker.exe
2076	RuntimeBroker.exe
2076	RuntimeBroker.exe
2076	RuntimeBroker.exe
2076	RuntimeBroker.exe
2076	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2076	RuntimeBroker.exe
Token: SeDebugPrivilege	4232	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 2076 wrote to memory of 5868	2076	RuntimeBroker.exe	78
PID 2076 wrote to memory of 5868	2076	RuntimeBroker.exe	78
PID 2076 wrote to memory of 5868	2076	RuntimeBroker.exe	78
PID 2076 wrote to memory of 1104	2076	RuntimeBroker.exe	80
PID 2076 wrote to memory of 1104	2076	RuntimeBroker.exe	80
PID 2076 wrote to memory of 1104	2076	RuntimeBroker.exe	80
PID 5868 wrote to memory of 5480	5868	cmd.exe	82
PID 5868 wrote to memory of 5480	5868	cmd.exe	82
PID 5868 wrote to memory of 5480	5868	cmd.exe	82
PID 1104 wrote to memory of 3784	1104	cmd.exe	83
PID 1104 wrote to memory of 3784	1104	cmd.exe	83
PID 1104 wrote to memory of 3784	1104	cmd.exe	83
PID 1104 wrote to memory of 4232	1104	cmd.exe	84
PID 1104 wrote to memory of 4232	1104	cmd.exe	84
PID 1104 wrote to memory of 4232	1104	cmd.exe	84
PID 4232 wrote to memory of 4360	4232	RuntimeBroker.exe	86
PID 4232 wrote to memory of 4360	4232	RuntimeBroker.exe	86
PID 4232 wrote to memory of 4360	4232	RuntimeBroker.exe	86
PID 4232 wrote to memory of 4544	4232	RuntimeBroker.exe	88
PID 4232 wrote to memory of 4544	4232	RuntimeBroker.exe	88
PID 4232 wrote to memory of 4544	4232	RuntimeBroker.exe	88
PID 4544 wrote to memory of 3428	4544	cmd.exe	90
PID 4544 wrote to memory of 3428	4544	cmd.exe	90
PID 4544 wrote to memory of 3428	4544	cmd.exe	90
PID 4360 wrote to memory of 2340	4360	cmd.exe	91
PID 4360 wrote to memory of 2340	4360	cmd.exe	91
PID 4360 wrote to memory of 2340	4360	cmd.exe	91

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:2076
- 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:5868
- - 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:5480
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp6CB4.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1104
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:3784
- - 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
    - Suspicious use of WriteProcessMemory
    PID:4232
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /delete /f /tn "RuntimeBroker"
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:4360
    - - C:\Windows\SysWOW64\schtasks.exe
        
        schtasks /delete /f /tn "RuntimeBroker"
        5⤵
        System Location Discovery: System Language Discovery
        
        PID:2340
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpDE0C.tmp.bat""
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:4544
    - - C:\Windows\SysWOW64\timeout.exe
        
        timeout 3
        5⤵
        System Location Discovery: System Language Discovery
        Delays execution with timeout.exe
        
        PID:3428

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\Microsoft\CLR_v4.0_32\UsageLogs\RuntimeBroker.exe.log

Filesize
522B

MD5
db9f45365506c49961bfaf3be1475ad2

SHA1
6bd7222f7b7e3e9685207cb285091c92728168e4

SHA256
3a8c487575696f7ace931dc220c85a47d33e0ead96aa9e47c705fee5dfac667a

SHA512
807028e2aed5b25b2d19ec4f09867746456de4e506c90c73e6730b35303511349a79ca0b9290509664edc0433d47e3fc7f2661534293ebb82185b1494da86a41

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp6CB4.tmp.bat

Filesize
157B

MD5
bcce4ff6f03b628e24c7ef1acc478d1f

SHA1
572119348f61e27de19f2104cd128c841d7b2e2b

SHA256
6687c4857b20d79547c3c766e7ca6d03d0c0d4d8f03fbf213fb545b344f67eb8

SHA512
747f8a5193a40022dc720f8a99268d6191fa5830889d8a2a6ccf3e9fac8f54415fbd22b5ad3d14335e1e2f0dac72b15334785a9afc38ab0036e18e4ee3692698

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpDE0C.tmp.bat

Filesize
162B

MD5
a9a3e5c8f2c45dc88e16f7583e376433

SHA1
65ca37135366c201a9dfaf476270232a5901fd91

SHA256
e17c0d59911b8126c7e231d82020e7bb349a4e790384af709b206a03c0c17efb

SHA512
d3a2fb7851e39f8420cf79b04b28388a4a23f06ccf3f059289d51e2455bce99a2a204ab26f33bf5c6be5a35de9ca9ed019e6f7ad42e710d76a8da3033b5d6f34

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

Filesize
45KB

MD5
7a984e3a8ef99e429ceef1f1ddc144f4

SHA1
581dd32af3c53b1dc7b8a95aa2805ee0e8f44190

SHA256
4d8c876b969caf2449f169f89ec257f5e1412e23b609ab4f7c7ee72cd4b0de60

SHA512
b078b827e49cddfd743dd55802c0a48dc5056ccb172cb83a65e484a26c62fa30e1fa6860621752d4adbad3e5d234d759c817a0c0b3532531a99f50f05622bf6a

Download Submit
memory/2076-1-0x00000000004F0000-0x0000000000502000-memory.dmp

Filesize
72KB

Download
memory/2076-2-0x00000000056A0000-0x000000000573C000-memory.dmp

Filesize
624KB

Download
memory/2076-0-0x0000000074FCE000-0x0000000074FCF000-memory.dmp

Filesize
4KB

Download
memory/4232-12-0x0000000074F10000-0x00000000756C1000-memory.dmp

Filesize
7.7MB

Download
memory/4232-16-0x00000000059D0000-0x0000000005A36000-memory.dmp

Filesize
408KB

Download
memory/4232-17-0x0000000074F10000-0x00000000756C1000-memory.dmp

Filesize
7.7MB

Download
memory/4232-18-0x0000000006E30000-0x0000000006EA6000-memory.dmp

Filesize
472KB

Download
memory/4232-19-0x0000000006490000-0x00000000064F4000-memory.dmp

Filesize
400KB

Download
memory/4232-20-0x0000000006E00000-0x0000000006E1E000-memory.dmp

Filesize
120KB

Download
memory/4232-15-0x0000000006500000-0x0000000006AA6000-memory.dmp

Filesize
5.6MB

Download
memory/4232-24-0x0000000074F10000-0x00000000756C1000-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