asyncrat | f4d5285b5ddf8b93586572c67c90434c952d9ffd868508d4de0be44377b3bd0b

General

Target

f4d5285b5ddf8b93586572c67c90434c952d9ffd868508d4de0be44377b3bd0b.exe
Size

53KB
MD5

a61b4683de0819ea1759ab9213ac77d7
SHA1

8b96224454aa706139d751816c724a882ac563ed
SHA256

f4d5285b5ddf8b93586572c67c90434c952d9ffd868508d4de0be44377b3bd0b
SHA512

de600e0d26208ecd66e3bb647e9316e2bba2e7b5282c615c603878034f0a5ea6612ca48a82768181fb3fe611659e9f226ad053b7f8970978a7f302ad2dec7f5b
SSDEEP

768:bTA6UyXqdGMaZpbWPU/xHn1ftNSWMyOpcHOl2k5j/FBWKP62r9a8tYcFGVc6K:AvzOLbWmHrlMyEc/WFBXFr9aAGVcl

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

1.0.7

Botnet

Default

Mutex

WindowsProcess2555AV738w30weweew28378

Attributes

delay
1
install
true
install_file
WindowsUserPerformanceMonitor.exe
install_folder
%AppData%
pastebin_config
https://pastebin.com/raw/hBHVtPrB

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/0x000b000000023b90-11.dat	family_asyncrat

Checks computer location settings 2 TTPs 2 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-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	f4d5285b5ddf8b93586572c67c90434c952d9ffd868508d4de0be44377b3bd0b.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	TempApp.exe

Executes dropped EXE 2 IoCs

pid	Process
4984	TempApp.exe
4556	WindowsUserPerformanceMonitor.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
22	pastebin.com
23	pastebin.com

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 1 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	f4d5285b5ddf8b93586572c67c90434c952d9ffd868508d4de0be44377b3bd0b.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3176	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
1736	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
4984	TempApp.exe
4984	TempApp.exe
4984	TempApp.exe
4984	TempApp.exe
4984	TempApp.exe
4984	TempApp.exe
4984	TempApp.exe
4984	TempApp.exe
4984	TempApp.exe
4984	TempApp.exe
4984	TempApp.exe
4984	TempApp.exe
4984	TempApp.exe
4984	TempApp.exe
4984	TempApp.exe
4984	TempApp.exe
4984	TempApp.exe
4984	TempApp.exe
4984	TempApp.exe
4984	TempApp.exe
4984	TempApp.exe
4984	TempApp.exe
4984	TempApp.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1404	f4d5285b5ddf8b93586572c67c90434c952d9ffd868508d4de0be44377b3bd0b.exe
Token: SeDebugPrivilege	4984	TempApp.exe
Token: SeDebugPrivilege	4556	WindowsUserPerformanceMonitor.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 1404 wrote to memory of 4984	1404	f4d5285b5ddf8b93586572c67c90434c952d9ffd868508d4de0be44377b3bd0b.exe	83
PID 1404 wrote to memory of 4984	1404	f4d5285b5ddf8b93586572c67c90434c952d9ffd868508d4de0be44377b3bd0b.exe	83
PID 4984 wrote to memory of 3752	4984	TempApp.exe	85
PID 4984 wrote to memory of 3752	4984	TempApp.exe	85
PID 4984 wrote to memory of 4228	4984	TempApp.exe	87
PID 4984 wrote to memory of 4228	4984	TempApp.exe	87
PID 4228 wrote to memory of 3176	4228	cmd.exe	89
PID 4228 wrote to memory of 3176	4228	cmd.exe	89
PID 3752 wrote to memory of 1736	3752	cmd.exe	90
PID 3752 wrote to memory of 1736	3752	cmd.exe	90
PID 4228 wrote to memory of 4556	4228	cmd.exe	91
PID 4228 wrote to memory of 4556	4228	cmd.exe	91

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\f4d5285b5ddf8b93586572c67c90434c952d9ffd868508d4de0be44377b3bd0b.exe
"C:\Users\Admin\AppData\Local\Temp\f4d5285b5ddf8b93586572c67c90434c952d9ffd868508d4de0be44377b3bd0b.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1404
- C:\Users\Admin\AppData\Local\Temp\TempApp.exe
  "C:\Users\Admin\AppData\Local\Temp\TempApp.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4984
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "WindowsUserPerformanceMonitor" /tr '"C:\Users\Admin\AppData\Roaming\WindowsUserPerformanceMonitor.exe"' & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3752
  - - C:\Windows\system32\schtasks.exe
      schtasks /create /f /sc onlogon /rl highest /tn "WindowsUserPerformanceMonitor" /tr '"C:\Users\Admin\AppData\Roaming\WindowsUserPerformanceMonitor.exe"'
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:1736
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp99CF.tmp.bat""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4228
  - - C:\Windows\system32\timeout.exe
      timeout 3
      4⤵
      Delays execution with timeout.exe
      PID:3176
  - - C:\Users\Admin\AppData\Roaming\WindowsUserPerformanceMonitor.exe
      "C:\Users\Admin\AppData\Roaming\WindowsUserPerformanceMonitor.exe"
      4⤵
      Executes dropped EXE
      Suspicious use of AdjustPrivilegeToken
      PID:4556

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

2

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\TempApp.exe

Filesize
48KB

MD5
3d8aafc8ab36b03c90e925e72eb78efb

SHA1
03d22f31f27e2de64b6c52f3073d711a0f726035

SHA256
b9161b198d8ba4e0c6497e1086b22032b48f851a662e7e46fbc926d57db73e4d

SHA512
f316649f4cd3fb778fb58f20ecd32ecc293ae19e7b59ee7182a99635abe3dd6043140a854fa11166ab06a5b24f2e8718e5fc55d30cd53b67497cbdccc6b6375b

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp99CF.tmp.bat

Filesize
173B

MD5
2d879cb812165ba620226904c1b8327b

SHA1
bbaff4b3049ea08b376289d61637a0bb0b063797

SHA256
010dc9c69a4e569b3dccc91468d75e4a98c062c283c469eea16b6c43d0a84dff

SHA512
9dfca4039f2122db17d09eec1e0eb4ea1232518c7d04123f4895077563e7305174e865ed981efc4a91b2053b94e8847039d1a0ca0ad185463502c1104e829ba8

Download Submit
memory/1404-6-0x0000000075180000-0x0000000075930000-memory.dmp

Filesize
7.7MB

Download
memory/1404-3-0x0000000005010000-0x00000000050A2000-memory.dmp

Filesize
584KB

Download
memory/1404-4-0x00000000050D0000-0x00000000050DA000-memory.dmp

Filesize
40KB

Download
memory/1404-5-0x0000000075180000-0x0000000075930000-memory.dmp

Filesize
7.7MB

Download
memory/1404-0-0x000000007518E000-0x000000007518F000-memory.dmp

Filesize
4KB

Download
memory/1404-2-0x00000000056A0000-0x0000000005C44000-memory.dmp

Filesize
5.6MB

Download
memory/1404-1-0x0000000000620000-0x0000000000632000-memory.dmp

Filesize
72KB

Download
memory/1404-27-0x000000007518E000-0x000000007518F000-memory.dmp

Filesize
4KB

Download
memory/1404-31-0x0000000075180000-0x0000000075930000-memory.dmp

Filesize
7.7MB

Download
memory/4984-18-0x00007FF8BC243000-0x00007FF8BC245000-memory.dmp

Filesize
8KB

Download
memory/4984-19-0x00000000000E0000-0x00000000000F2000-memory.dmp

Filesize
72KB

Download
memory/4984-20-0x00007FF8BC240000-0x00007FF8BCD01000-memory.dmp

Filesize
10.8MB

Download
memory/4984-25-0x00007FF8BC240000-0x00007FF8BCD01000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads