asyncrat | f69ad405332cc0eac4dab5fd44326bc5863e0c255b967eb4332472dbf211a921

General

Target
fpsbooster.exe
Size 45KB
Sample240509-ykppqaee86
SHA256 f69ad405332cc0eac4dab5fd44326bc5863e0c255b967eb4332472dbf211a921
MD5 3a17036739900c3fe1e6ee49fd7e3633
SHA1 704752d5a82035caba60a33486656b6a596efe95
SHA512 55c825b4c7e46d3872a2588e65d1ad3aaf3fbeab011a781033f3227a8ceaf46c8cdb4b3786e3f009d675e3e455b020c086b1be9d90405433a90bd600bd496de0
SSDEEP 768:uu+U1TQQEX1WUVt1Pmo2qjLKjPGagAWOzjbFgX3iVKR4l3LpL6sq1OwvzcDZnf+:uu+U1TQfb2+KTKTO3bCXSW4X+1Sdnf+
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

C2

127.0.0.1:1604

Mutex

AsyncMutex_6SI8OkPnk

Attributes

delay
3
install
true
install_file
systeamupdate.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/0x0008000000023231-11.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-1-5-21-3808065738-1666277613-1125846146-1000\Control Panel\International\Geo\Nation	fpsbooster.exe

Executes dropped EXE 1 IoCs

pid	Process
2100	systeamupdate.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
3456	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
5100	timeout.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
1600	fpsbooster.exe
1600	fpsbooster.exe
1600	fpsbooster.exe
1600	fpsbooster.exe
1600	fpsbooster.exe
1600	fpsbooster.exe
1600	fpsbooster.exe
1600	fpsbooster.exe
1600	fpsbooster.exe
1600	fpsbooster.exe
1600	fpsbooster.exe
1600	fpsbooster.exe
1600	fpsbooster.exe
1600	fpsbooster.exe
1600	fpsbooster.exe
1600	fpsbooster.exe
1600	fpsbooster.exe
1600	fpsbooster.exe
1600	fpsbooster.exe
1600	fpsbooster.exe
1600	fpsbooster.exe
1600	fpsbooster.exe
1600	fpsbooster.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1600	fpsbooster.exe
Token: SeDebugPrivilege	2100	systeamupdate.exe
Token: SeDebugPrivilege	2100	systeamupdate.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1600 wrote to memory of 1780	1600	fpsbooster.exe	92
PID 1600 wrote to memory of 1780	1600	fpsbooster.exe	92
PID 1600 wrote to memory of 1780	1600	fpsbooster.exe	92
PID 1600 wrote to memory of 4088	1600	fpsbooster.exe	94
PID 1600 wrote to memory of 4088	1600	fpsbooster.exe	94
PID 1600 wrote to memory of 4088	1600	fpsbooster.exe	94
PID 4088 wrote to memory of 5100	4088	cmd.exe	97
PID 4088 wrote to memory of 5100	4088	cmd.exe	97
PID 4088 wrote to memory of 5100	4088	cmd.exe	97
PID 1780 wrote to memory of 3456	1780	cmd.exe	96
PID 1780 wrote to memory of 3456	1780	cmd.exe	96
PID 1780 wrote to memory of 3456	1780	cmd.exe	96
PID 4088 wrote to memory of 2100	4088	cmd.exe	102
PID 4088 wrote to memory of 2100	4088	cmd.exe	102
PID 4088 wrote to memory of 2100	4088	cmd.exe	102

C:\Users\Admin\AppData\Local\Temp\fpsbooster.exe
"C:\Users\Admin\AppData\Local\Temp\fpsbooster.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1600
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "systeamupdate" /tr '"C:\Users\Admin\AppData\Roaming\systeamupdate.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1780
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "systeamupdate" /tr '"C:\Users\Admin\AppData\Roaming\systeamupdate.exe"'
    3⤵
    - Creates scheduled task(s)
    PID:3456
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp80A.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4088
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:5100
- - C:\Users\Admin\AppData\Roaming\systeamupdate.exe
    "C:\Users\Admin\AppData\Roaming\systeamupdate.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:2100

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=3704 --field-trial-handle=2284,i,15722001240173834669,15048020084704567542,262144 --variations-seed-version /prefetch:8
1⤵
PID:3944

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

tmp80A.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp80A.tmp.bat
Size 156B
SHA256 53d08943ba75e335b8d08abb6d9d05903a843d77f4d7a10a076c0a66347684b5
MD5 8e0e837882683ef04f26289ccd7611c1
SHA1 d1ddc4b29a9f95c3bcaf7d4aef2f397e8845f78e
SHA512 29f1eadee932797b3ff1dcd02f484b6f2fbbccbc27b6b284c5b8839cf4bdab32f780719608d9152fe65e02e9990ca280b457f504f470faea5ed86a2bf22a657a
MD5 SHA1 SHA512

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systeamupdate.exe

Path C:\Users\Admin\AppData\Roaming\systeamupdate.exe
Size 45KB
SHA256 f69ad405332cc0eac4dab5fd44326bc5863e0c255b967eb4332472dbf211a921
MD5 3a17036739900c3fe1e6ee49fd7e3633
SHA1 704752d5a82035caba60a33486656b6a596efe95
SHA512 55c825b4c7e46d3872a2588e65d1ad3aaf3fbeab011a781033f3227a8ceaf46c8cdb4b3786e3f009d675e3e455b020c086b1be9d90405433a90bd600bd496de0
SSDEEP 768:uu+U1TQQEX1WUVt1Pmo2qjLKjPGagAWOzjbFgX3iVKR4l3LpL6sq1OwvzcDZnf+:uu+U1TQfb2+KTKTO3bCXSW4X+1Sdnf+
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/1600-0-0x000000007458E000-0x000000007458F000-memory.dmp

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memory/1600-1-0x0000000000B50000-0x0000000000B62000-memory.dmp

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memory/1600-2-0x0000000074580000-0x0000000074D30000-memory.dmp

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memory/1600-3-0x0000000005690000-0x000000000572C000-memory.dmp

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memory/1600-9-0x0000000074580000-0x0000000074D30000-memory.dmp

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memory/2100-13-0x00000000744E0000-0x0000000074C90000-memory.dmp

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memory/2100-14-0x00000000744E0000-0x0000000074C90000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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