asyncrat | 62633f30dcde970ba66ae44c9175ece9953c8f39fcbb54ef2fcd54d473cba808

General

Target

KKKApi.exe
Size

45KB
MD5

2c147ac800cab2d7899c22768c586f3d
SHA1

e9774daaffc7b312fc8162cf8d4a6dbf28d47361
SHA256

62633f30dcde970ba66ae44c9175ece9953c8f39fcbb54ef2fcd54d473cba808
SHA512

d67272bafabf95a1c1d818d8d5a67aa4052e646e8c9394d7d37995d39f47d814c08d8c539927747437ddd4ec73c4e1a14149aa06fe9b11e452b659ef6423918a
SSDEEP

768:muokxmFTkUE1YAgWUOl1nyamo2qR6ITnyfaaPIVzjbMgX3iPogj5CWQcttzUBDZw:muokxmFTkUMYi1t2lEhV3bDXSPnj5lvF

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

193.23.160.13:7707

Mutex

GAD1XUdwNDb7

Attributes

delay
3
install
true
install_file
Server-Host.exe
install_folder
%AppData%

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral2/files/0x000b000000023403-11.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-1-5-21-3419463127-3903270268-2580331543-1000\Control Panel\International\Geo\Nation	KKKApi.exe

Executes dropped EXE 1 IoCs

pid	Process
3344	Server-Host.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	KKKApi.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	Server-Host.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
4928	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
1984	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
1500	KKKApi.exe
1500	KKKApi.exe
1500	KKKApi.exe
1500	KKKApi.exe
1500	KKKApi.exe
1500	KKKApi.exe
1500	KKKApi.exe
1500	KKKApi.exe
1500	KKKApi.exe
1500	KKKApi.exe
1500	KKKApi.exe
1500	KKKApi.exe
1500	KKKApi.exe
1500	KKKApi.exe
1500	KKKApi.exe
1500	KKKApi.exe
1500	KKKApi.exe
1500	KKKApi.exe
1500	KKKApi.exe
1500	KKKApi.exe
1500	KKKApi.exe
1500	KKKApi.exe
1500	KKKApi.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1500	KKKApi.exe
Token: SeDebugPrivilege	3344	Server-Host.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1500 wrote to memory of 1016	1500	KKKApi.exe	94
PID 1500 wrote to memory of 1016	1500	KKKApi.exe	94
PID 1500 wrote to memory of 1016	1500	KKKApi.exe	94
PID 1500 wrote to memory of 5100	1500	KKKApi.exe	96
PID 1500 wrote to memory of 5100	1500	KKKApi.exe	96
PID 1500 wrote to memory of 5100	1500	KKKApi.exe	96
PID 1016 wrote to memory of 1984	1016	cmd.exe	98
PID 1016 wrote to memory of 1984	1016	cmd.exe	98
PID 1016 wrote to memory of 1984	1016	cmd.exe	98
PID 5100 wrote to memory of 4928	5100	cmd.exe	99
PID 5100 wrote to memory of 4928	5100	cmd.exe	99
PID 5100 wrote to memory of 4928	5100	cmd.exe	99
PID 5100 wrote to memory of 3344	5100	cmd.exe	101
PID 5100 wrote to memory of 3344	5100	cmd.exe	101
PID 5100 wrote to memory of 3344	5100	cmd.exe	101

C:\Users\Admin\AppData\Local\Temp\KKKApi.exe
"C:\Users\Admin\AppData\Local\Temp\KKKApi.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1500
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Server-Host" /tr '"C:\Users\Admin\AppData\Roaming\Server-Host.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1016
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "Server-Host" /tr '"C:\Users\Admin\AppData\Roaming\Server-Host.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1984
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpAB34.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5100
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4928
- - C:\Users\Admin\AppData\Roaming\Server-Host.exe
    "C:\Users\Admin\AppData\Roaming\Server-Host.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:3344

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\tmpAB34.tmp.bat

Filesize
155B

MD5
0860cbb445800bc8de4db076ef90d4a6

SHA1
56b2f398882a64e16be7e13f9344646434c9172a

SHA256
d91522b44585dd3a4c88bbdfdc857d3969b0c114b1c27620596de5f1990e1b67

SHA512
f955f0e0ac606d9452a1ba8c8741df58957ea9c402ac8028afbf6d9492fbe55eb07a2e612c2ede85199fd77a529166246095150350266fd2d76f0138ed29752c

Download Submit
C:\Users\Admin\AppData\Roaming\Server-Host.exe

Filesize
45KB

MD5
2c147ac800cab2d7899c22768c586f3d

SHA1
e9774daaffc7b312fc8162cf8d4a6dbf28d47361

SHA256
62633f30dcde970ba66ae44c9175ece9953c8f39fcbb54ef2fcd54d473cba808

SHA512
d67272bafabf95a1c1d818d8d5a67aa4052e646e8c9394d7d37995d39f47d814c08d8c539927747437ddd4ec73c4e1a14149aa06fe9b11e452b659ef6423918a

Download Submit
memory/1500-3-0x00000000055E0000-0x000000000567C000-memory.dmp

Filesize
624KB

Download
memory/1500-0-0x0000000074A5E000-0x0000000074A5F000-memory.dmp

Filesize
4KB

Download
memory/1500-8-0x0000000074A50000-0x0000000075200000-memory.dmp

Filesize
7.7MB

Download
memory/1500-2-0x0000000074A50000-0x0000000075200000-memory.dmp

Filesize
7.7MB

Download
memory/1500-1-0x0000000000BF0000-0x0000000000C02000-memory.dmp

Filesize
72KB

Download
memory/3344-13-0x0000000074A50000-0x0000000075200000-memory.dmp

Filesize
7.7MB

Download
memory/3344-14-0x0000000005E20000-0x00000000063C4000-memory.dmp

Filesize
5.6MB

Download
memory/3344-15-0x00000000058E0000-0x0000000005946000-memory.dmp

Filesize
408KB

Download
memory/3344-16-0x0000000006A50000-0x0000000006AC6000-memory.dmp

Filesize
472KB

Download
memory/3344-17-0x00000000069D0000-0x0000000006A38000-memory.dmp

Filesize
416KB

Download
memory/3344-18-0x0000000006B10000-0x0000000006B2E000-memory.dmp

Filesize
120KB

Download
memory/3344-19-0x0000000006ED0000-0x0000000006F62000-memory.dmp

Filesize
584KB

Download
memory/3344-20-0x0000000074A50000-0x0000000075200000-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