asyncrat | a31527ac5e1df418a9ee25b623ad730c44e18b4b62aa6e649bb6e5fd9e0088f5

General

Target

..exe
Size

145KB
MD5

a55e72b66a2767fa68ae713250ff0b21
SHA1

550d1c5ef3c23cc59392ea24c67f4f43669cecef
SHA256

a31527ac5e1df418a9ee25b623ad730c44e18b4b62aa6e649bb6e5fd9e0088f5
SHA512

cb47663be048c07c6e9e6387946a512f0435be1a4034a5ee2549025b70cd4c5868bfba0ea3e76af0700492f1c8dc388f83e0c7f37ac64011ed2eaca06daef1d2
SSDEEP

3072:VuIJT8kD2gEdIOcYgb8GHOxk0y+Bz65/M6If+3Js+3JFkKeTnYx:VuITSzCOPgbmyMxBt25v

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

192.168.0.174:8808

Mutex

ejrY4UrkOJwj

Attributes

delay
3
install
true
install_file
System Handler.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/files/0x0008000000023cab-12.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-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	..exe

Executes dropped EXE 1 IoCs

pid	Process
2448	System Handler.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	cmd.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	System Handler.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	..exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3076	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
4116	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
1284	..exe
1284	..exe
1284	..exe
1284	..exe
1284	..exe
1284	..exe
1284	..exe
1284	..exe
1284	..exe
1284	..exe
1284	..exe
1284	..exe
1284	..exe
1284	..exe
1284	..exe
1284	..exe
1284	..exe
1284	..exe
1284	..exe
1284	..exe
1284	..exe
1284	..exe
1284	..exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1284	..exe
Token: SeDebugPrivilege	2448	System Handler.exe
Token: SeDebugPrivilege	2448	System Handler.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1284 wrote to memory of 1628	1284	..exe	86
PID 1284 wrote to memory of 1628	1284	..exe	86
PID 1284 wrote to memory of 1628	1284	..exe	86
PID 1284 wrote to memory of 2572	1284	..exe	88
PID 1284 wrote to memory of 2572	1284	..exe	88
PID 1284 wrote to memory of 2572	1284	..exe	88
PID 2572 wrote to memory of 3076	2572	cmd.exe	90
PID 2572 wrote to memory of 3076	2572	cmd.exe	90
PID 2572 wrote to memory of 3076	2572	cmd.exe	90
PID 1628 wrote to memory of 4116	1628	cmd.exe	91
PID 1628 wrote to memory of 4116	1628	cmd.exe	91
PID 1628 wrote to memory of 4116	1628	cmd.exe	91
PID 2572 wrote to memory of 2448	2572	cmd.exe	92
PID 2572 wrote to memory of 2448	2572	cmd.exe	92
PID 2572 wrote to memory of 2448	2572	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\..exe
"C:\Users\Admin\AppData\Local\Temp\..exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1284
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "System Handler" /tr '"C:\Users\Admin\AppData\Roaming\System Handler.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1628
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "System Handler" /tr '"C:\Users\Admin\AppData\Roaming\System Handler.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4116
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpB0A3.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2572
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:3076
- - C:\Users\Admin\AppData\Roaming\System Handler.exe
    "C:\Users\Admin\AppData\Roaming\System Handler.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2448

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\tmpB0A3.tmp.bat

Filesize
158B

MD5
35fa8638e9b19632b82dbac83900fe6c

SHA1
cd1e96fbe52429ec8d92d68ff6c5c86ea7fef162

SHA256
da8a02af9c748fb36b9c4e4c99c171db65c9e43a63412b2e3082263023bd88db

SHA512
5cbe3b4f62ab5f273153b4ac66b647213183f2cc9ee9518e3acc94052302874e4baf3f16d9436fbffd491c11942f6018f3dd23a1388c6d790c8739884d26b82d

Download Submit
C:\Users\Admin\AppData\Roaming\System Handler.exe

Filesize
145KB

MD5
a55e72b66a2767fa68ae713250ff0b21

SHA1
550d1c5ef3c23cc59392ea24c67f4f43669cecef

SHA256
a31527ac5e1df418a9ee25b623ad730c44e18b4b62aa6e649bb6e5fd9e0088f5

SHA512
cb47663be048c07c6e9e6387946a512f0435be1a4034a5ee2549025b70cd4c5868bfba0ea3e76af0700492f1c8dc388f83e0c7f37ac64011ed2eaca06daef1d2

Download Submit
memory/1284-0-0x0000000074E6E000-0x0000000074E6F000-memory.dmp

Filesize
4KB

Download
memory/1284-1-0x0000000000780000-0x00000000007AA000-memory.dmp

Filesize
168KB

Download
memory/1284-2-0x0000000074E60000-0x0000000075610000-memory.dmp

Filesize
7.7MB

Download
memory/1284-3-0x0000000005120000-0x0000000005186000-memory.dmp

Filesize
408KB

Download
memory/1284-4-0x00000000055F0000-0x000000000568C000-memory.dmp

Filesize
624KB

Download
memory/1284-9-0x0000000074E60000-0x0000000075610000-memory.dmp

Filesize
7.7MB

Download
memory/2448-14-0x0000000074DB0000-0x0000000075560000-memory.dmp

Filesize
7.7MB

Download
memory/2448-15-0x0000000074DB0000-0x0000000075560000-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