asyncrat | d5965c899e5413e91ab7b75669b35d6797b5462c64f99f217a4014e8e4deafbd

General

Target

RuntimeBroker.exe
Size

48KB
MD5

f814cb9c71d35f8bd503b6d9949aca22
SHA1

96cb19b70bbcab9627cc3c37a384287a1162dc7c
SHA256

d5965c899e5413e91ab7b75669b35d6797b5462c64f99f217a4014e8e4deafbd
SHA512

072b7a7cc5be22435d9c498f85479ac51891dbcb2fac8305236f156bada662398e35d53507cc5c4c5094f7bb7c979a47136249f9e7094dd652a1f9e5fb1c3a5f
SSDEEP

768:OuKjfdT9IQzpWUBj2Tmo2qLmcvELhoPI4F5V3uRN0boPXqVuaCm85d6hhBDZ9Tj:OuafdT93O2qELjQ5V3ugbo/Ez6did9Tj

Score

10^/10

asyncrat default discovery rat spyware stealer

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

holefo2785-22820.portmap.host:22820

holefo2785-22820.portmap.host:6606

Mutex

Oma7kBAtvlxY

Attributes

delay
3
install
true
install_file
discord.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/0x001a00000002b454-10.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
1016	discord.exe

Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003
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	cmd.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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	discord.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe

Delays execution with timeout.exe 2 IoCs

defense_evasion

pid	Process
4480	timeout.exe
5008	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
2824	schtasks.exe

Suspicious behavior: EnumeratesProcesses 17 IoCs

pid	Process
4932	RuntimeBroker.exe
4932	RuntimeBroker.exe
4932	RuntimeBroker.exe
4932	RuntimeBroker.exe
4932	RuntimeBroker.exe
4932	RuntimeBroker.exe
4932	RuntimeBroker.exe
4932	RuntimeBroker.exe
4932	RuntimeBroker.exe
4932	RuntimeBroker.exe
4932	RuntimeBroker.exe
4932	RuntimeBroker.exe
4932	RuntimeBroker.exe
4932	RuntimeBroker.exe
4932	RuntimeBroker.exe
4932	RuntimeBroker.exe
4932	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4932	RuntimeBroker.exe
Token: SeDebugPrivilege	1016	discord.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 4932 wrote to memory of 5332	4932	RuntimeBroker.exe	79
PID 4932 wrote to memory of 5332	4932	RuntimeBroker.exe	79
PID 4932 wrote to memory of 5332	4932	RuntimeBroker.exe	79
PID 4932 wrote to memory of 6068	4932	RuntimeBroker.exe	81
PID 4932 wrote to memory of 6068	4932	RuntimeBroker.exe	81
PID 4932 wrote to memory of 6068	4932	RuntimeBroker.exe	81
PID 5332 wrote to memory of 2824	5332	cmd.exe	83
PID 5332 wrote to memory of 2824	5332	cmd.exe	83
PID 5332 wrote to memory of 2824	5332	cmd.exe	83
PID 6068 wrote to memory of 5008	6068	cmd.exe	84
PID 6068 wrote to memory of 5008	6068	cmd.exe	84
PID 6068 wrote to memory of 5008	6068	cmd.exe	84
PID 6068 wrote to memory of 1016	6068	cmd.exe	85
PID 6068 wrote to memory of 1016	6068	cmd.exe	85
PID 6068 wrote to memory of 1016	6068	cmd.exe	85
PID 1016 wrote to memory of 4756	1016	discord.exe	86
PID 1016 wrote to memory of 4756	1016	discord.exe	86
PID 1016 wrote to memory of 4756	1016	discord.exe	86
PID 1016 wrote to memory of 4876	1016	discord.exe	88
PID 1016 wrote to memory of 4876	1016	discord.exe	88
PID 1016 wrote to memory of 4876	1016	discord.exe	88
PID 4756 wrote to memory of 4360	4756	cmd.exe	90
PID 4756 wrote to memory of 4360	4756	cmd.exe	90
PID 4756 wrote to memory of 4360	4756	cmd.exe	90
PID 4876 wrote to memory of 4480	4876	cmd.exe	91
PID 4876 wrote to memory of 4480	4876	cmd.exe	91
PID 4876 wrote to memory of 4480	4876	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:4932
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "discord" /tr '"C:\Users\Admin\AppData\Roaming\discord.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5332
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "discord" /tr '"C:\Users\Admin\AppData\Roaming\discord.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2824
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpB0D9.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:6068
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:5008
- - C:\Users\Admin\AppData\Roaming\discord.exe
    "C:\Users\Admin\AppData\Roaming\discord.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:1016
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /delete /f /tn "discord"
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:4756
    - - C:\Windows\SysWOW64\schtasks.exe
        
        schtasks /delete /f /tn "discord"
        5⤵
        System Location Discovery: System Language Discovery
        
        PID:4360
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp1A70.tmp.bat""
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:4876
    - - C:\Windows\SysWOW64\timeout.exe
        
        timeout 3
        5⤵
        System Location Discovery: System Language Discovery
        Delays execution with timeout.exe
        
        PID:4480

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

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

1

T1552

Credentials In Files

1

T1552.001

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp1A70.tmp.bat

Filesize
156B

MD5
c5272ce8dfb43dcec732342fda03001c

SHA1
1470f7dd08dd3ec8334c31d01edbec3f46c47e42

SHA256
de530b367eb8b667ec99a796811846f4a15b989c8656f5caef9f90dd7f218a33

SHA512
2b1468408495960f76d5d31040cc32df4d2633e9f9eded01b52eeb7cb3c0f1aba1009cd19ba6bbbc18aa77f57f3bc56ec15a687508a463c031878b79f25dea64

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpB0D9.tmp.bat

Filesize
151B

MD5
6c976e13b5060a52eeb1a28145d38688

SHA1
b5f80ca725fc26f5b663f192583d601aac360816

SHA256
13f2f77755b12e4ae5159952ae23a1bb95b58ddd997b8fff0b99ec3b1729011c

SHA512
03b8f9ed4db44a2b9ba4f542e6e87b9031f55eace4ec073c6dc19fd85bea67338681615ae2052f98b8d1fb1ee440278e8cfb9c08f03d02de2159a76de26c0217

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

Filesize
48KB

MD5
f814cb9c71d35f8bd503b6d9949aca22

SHA1
96cb19b70bbcab9627cc3c37a384287a1162dc7c

SHA256
d5965c899e5413e91ab7b75669b35d6797b5462c64f99f217a4014e8e4deafbd

SHA512
072b7a7cc5be22435d9c498f85479ac51891dbcb2fac8305236f156bada662398e35d53507cc5c4c5094f7bb7c979a47136249f9e7094dd652a1f9e5fb1c3a5f

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memory/1016-16-0x0000000074650000-0x0000000074E01000-memory.dmp

Filesize
7.7MB

Download
memory/1016-18-0x0000000006D00000-0x0000000006D9C000-memory.dmp

Filesize
624KB

Download
memory/1016-26-0x0000000074650000-0x0000000074E01000-memory.dmp

Filesize
7.7MB

Download
memory/1016-12-0x0000000074650000-0x0000000074E01000-memory.dmp

Filesize
7.7MB

Download
memory/1016-15-0x0000000006450000-0x00000000069F6000-memory.dmp

Filesize
5.6MB

Download
memory/1016-22-0x0000000007090000-0x00000000070F4000-memory.dmp

Filesize
400KB

Download
memory/1016-17-0x0000000006C80000-0x0000000006CF6000-memory.dmp

Filesize
472KB

Download
memory/1016-21-0x0000000006E00000-0x0000000006E0A000-memory.dmp

Filesize
40KB

Download
memory/1016-19-0x0000000006DA0000-0x0000000006DBE000-memory.dmp

Filesize
120KB

Download
memory/1016-20-0x0000000006DC0000-0x0000000006E00000-memory.dmp

Filesize
256KB

Download
memory/4932-3-0x00000000063E0000-0x000000000647C000-memory.dmp

Filesize
624KB

Download
memory/4932-0-0x000000007465E000-0x000000007465F000-memory.dmp

Filesize
4KB

Download
memory/4932-2-0x0000000005D50000-0x0000000005DB6000-memory.dmp

Filesize
408KB

Download
memory/4932-1-0x0000000000F10000-0x0000000000F22000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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