asyncrat | 9bc6f7078b4a80e7363336194ffccb04d646da487bb093775b3caefd224f7d87

Analysis

max time kernel
146s
max time network
151s
platform
windows7_x64
resource
win7-20230220-en
resource tags

arch:x64arch:x86image:win7-20230220-enlocale:en-usos:windows7-x64system
submitted
25/04/2023, 03:34

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General

Target
KaSr_uni.exe
Size 63KB
Sample230425-d424yaaa4y
SHA256 9bc6f7078b4a80e7363336194ffccb04d646da487bb093775b3caefd224f7d87
MD5 40b8f3c578549c6844fec4ba13c71dfc
SHA1 ddf2e0a2c47bc4b2bc2405eb643ea3da117fc205
SHA512 d15904201e1d4bc723c82eb40b7c90c3efdec073ed6f0a7dbae3590e55f098a15b8cabb6e902edc8398e8434d2c446ab8ddc11076c7fb0212ba23cbcd0f0d3a6
SSDEEP 1536:QhJ2nXvFHsHLhSNbfzYmdOpIYIbbTwEJn+G/tpqKmY7:OJ2nXvFHsHL+bbYutYIbbTBx12z
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Version

1.1.0

Botnet

Default

31.192.236.139:3434

Mutex

KalaChowaMutex_alladin

Attributes

delay
1
install
true
install_file
WinService.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 4 IoCs

rat

resource	yara_rule
behavioral1/memory/1596-54-0x00000000000C0000-0x00000000000D6000-memory.dmp	asyncrat
behavioral1/files/0x000a00000001231c-66.dat	asyncrat
behavioral1/files/0x000a00000001231c-67.dat	asyncrat
behavioral1/memory/1676-68-0x00000000012E0000-0x00000000012F6000-memory.dmp	asyncrat

Executes dropped EXE 1 IoCs

pid	Process
1676	WinService.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

T1053

pid	Process
648	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
468	timeout.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1596	KaSr_uni.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1596	KaSr_uni.exe
Token: SeDebugPrivilege	1676	WinService.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1596 wrote to memory of 1560	1596	KaSr_uni.exe	28
PID 1596 wrote to memory of 1560	1596	KaSr_uni.exe	28
PID 1596 wrote to memory of 1560	1596	KaSr_uni.exe	28
PID 1596 wrote to memory of 576	1596	KaSr_uni.exe	30
PID 1596 wrote to memory of 576	1596	KaSr_uni.exe	30
PID 1596 wrote to memory of 576	1596	KaSr_uni.exe	30
PID 576 wrote to memory of 468	576	cmd.exe	32
PID 576 wrote to memory of 468	576	cmd.exe	32
PID 576 wrote to memory of 468	576	cmd.exe	32
PID 1560 wrote to memory of 648	1560	cmd.exe	33
PID 1560 wrote to memory of 648	1560	cmd.exe	33
PID 1560 wrote to memory of 648	1560	cmd.exe	33
PID 576 wrote to memory of 1676	576	cmd.exe	34
PID 576 wrote to memory of 1676	576	cmd.exe	34
PID 576 wrote to memory of 1676	576	cmd.exe	34

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\KaSr_uni.exe
"C:\Users\Admin\AppData\Local\Temp\KaSr_uni.exe"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1596
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "WinService" /tr '"C:\Users\Admin\AppData\Roaming\WinService.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1560
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "WinService" /tr '"C:\Users\Admin\AppData\Roaming\WinService.exe"'
    3⤵
    - Creates scheduled task(s)
    PID:648
- C:\Windows\system32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp15F2.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:576
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:468
- - C:\Users\Admin\AppData\Roaming\WinService.exe
    "C:\Users\Admin\AppData\Roaming\WinService.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:1676

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

tmp15F2.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp15F2.tmp.bat
Size 154B
SHA256 d467b43f6e947c8a3ff6bf978004d40f356148bf5178664cc30e97b1db2f4cf2
MD5 6f9f83d546da0675a5c064038c9b3b0c
SHA1 1f6e8e30190f807ca6932dde1b34c57f2c429b42
SHA512 35214a928c5de06812316a1a554f36f98354f6142f4747af3e563ce94b979dfa0352353df3903c6caa298cbfe95db8e3e249bc23c7f48bb2a795d717adafb8ab
MD5 SHA1 SHA512

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tmp15F2.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp15F2.tmp.bat
Size 154B
SHA256 d467b43f6e947c8a3ff6bf978004d40f356148bf5178664cc30e97b1db2f4cf2
MD5 6f9f83d546da0675a5c064038c9b3b0c
SHA1 1f6e8e30190f807ca6932dde1b34c57f2c429b42
SHA512 35214a928c5de06812316a1a554f36f98354f6142f4747af3e563ce94b979dfa0352353df3903c6caa298cbfe95db8e3e249bc23c7f48bb2a795d717adafb8ab
MD5 SHA1 SHA512

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WinService.exe

Path C:\Users\Admin\AppData\Roaming\WinService.exe
Size 63KB
SHA256 9bc6f7078b4a80e7363336194ffccb04d646da487bb093775b3caefd224f7d87
MD5 40b8f3c578549c6844fec4ba13c71dfc
SHA1 ddf2e0a2c47bc4b2bc2405eb643ea3da117fc205
SHA512 d15904201e1d4bc723c82eb40b7c90c3efdec073ed6f0a7dbae3590e55f098a15b8cabb6e902edc8398e8434d2c446ab8ddc11076c7fb0212ba23cbcd0f0d3a6
SSDEEP 1536:QhJ2nXvFHsHLhSNbfzYmdOpIYIbbTwEJn+G/tpqKmY7:OJ2nXvFHsHL+bbYutYIbbTBx12z
MD5 SHA1 SHA512 SSDEEP

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WinService.exe

Path C:\Users\Admin\AppData\Roaming\WinService.exe
Size 63KB
SHA256 9bc6f7078b4a80e7363336194ffccb04d646da487bb093775b3caefd224f7d87
MD5 40b8f3c578549c6844fec4ba13c71dfc
SHA1 ddf2e0a2c47bc4b2bc2405eb643ea3da117fc205
SHA512 d15904201e1d4bc723c82eb40b7c90c3efdec073ed6f0a7dbae3590e55f098a15b8cabb6e902edc8398e8434d2c446ab8ddc11076c7fb0212ba23cbcd0f0d3a6
SSDEEP 1536:QhJ2nXvFHsHLhSNbfzYmdOpIYIbbTwEJn+G/tpqKmY7:OJ2nXvFHsHL+bbYutYIbbTBx12z
MD5 SHA1 SHA512 SSDEEP

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memory/1596-54-0x00000000000C0000-0x00000000000D6000-memory.dmp

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memory/1596-55-0x000000001B070000-0x000000001B0F0000-memory.dmp

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memory/1676-68-0x00000000012E0000-0x00000000012F6000-memory.dmp

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memory/1676-69-0x000000001B120000-0x000000001B1A0000-memory.dmp

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memory/1676-70-0x000000001B120000-0x000000001B1A0000-memory.dmp

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