asyncrat | 27126bcf10d8c1397aacbc9ccbcc7334874d92a52932ed33c786325454e0e37d

General

Target
tmp88px06ug.exe
Size 45KB
Sample260602-jjee2ahv9l
SHA256 27126bcf10d8c1397aacbc9ccbcc7334874d92a52932ed33c786325454e0e37d
MD5 c0eaebf86fb963c0f94b7ab0b49304a5
SHA1 28c63a652ca35834977fd6356b8ce14267747461
SHA512 b22cf950b1ba44936c2a6ce4a15e05e8714ff90dfca5efaa030c381ed20d7c4af649f9a4c56bfb0b39c06a51ad1a050d01601a9c955633fe1b042f084f5a7562
SSDEEP 768:puNA/9T85LafWUzvSdmo2qIm/cYssPJZOPIcvzjbOgXZio29I8kVFOi3BDZ7x:puNA/9T8p72CMIf3cv3bxXo3IHVFOix/
TLSH
T109232C003BD8822BF1BE4F7899F26145467AF2673603D58E1CC451DB5613FC6DA42AED
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

default defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

mtcostore.com:443
mtcostore.com:80
mtcostore.com:7797
mtcostore.com:8707
mtcostore.com:6620
www.mtcostore.com:443
www.mtcostore.com:80
www.mtcostore.com:7797
www.mtcostore.com:8707
www.mtcostore.com:6620
blaster.mtcostore.com:443
blaster.mtcostore.com:80
blaster.mtcostore.com:7797
blaster.mtcostore.com:8707
blaster.mtcostore.com:6620
stuxnet.mtcostore.com:443
stuxnet.mtcostore.com:80
stuxnet.mtcostore.com:7797
stuxnet.mtcostore.com:8707
stuxnet.mtcostore.com:6620

Mutex

YHgCaVD0ZDYL

Attributes

delay
0
install
true
install_file
t4tirq.exe
install_folder
%AppData%

aes.plain

Signatures

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

Async RAT payload 2 IoCs

rat

resource	yara_rule
behavioral2/files/0x0008000000024330-8.dat	family_asyncrat
behavioral2/memory/1672-10-0x0000000005550000-0x0000000005560000-memory.dmp	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-1-5-21-2370214745-1838013427-2987045292-1000\Control Panel\International\Geo\Nation	tmp88px06ug.exe

Executes dropped EXE 2 IoCs

pid	Process
1672	t4tirq.exe
3008	t4tirq.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 7 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	t4tirq.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	t4tirq.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	tmp88px06ug.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
2060	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
4936	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
2576	tmp88px06ug.exe
2576	tmp88px06ug.exe
2576	tmp88px06ug.exe
2576	tmp88px06ug.exe
2576	tmp88px06ug.exe
2576	tmp88px06ug.exe
2576	tmp88px06ug.exe
2576	tmp88px06ug.exe
2576	tmp88px06ug.exe
2576	tmp88px06ug.exe
2576	tmp88px06ug.exe
2576	tmp88px06ug.exe
2576	tmp88px06ug.exe
2576	tmp88px06ug.exe
2576	tmp88px06ug.exe
2576	tmp88px06ug.exe
2576	tmp88px06ug.exe
2576	tmp88px06ug.exe
2576	tmp88px06ug.exe
2576	tmp88px06ug.exe
2576	tmp88px06ug.exe
2576	tmp88px06ug.exe
2576	tmp88px06ug.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2576	tmp88px06ug.exe
Token: SeDebugPrivilege	1672	t4tirq.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 2576 wrote to memory of 4752	2576	tmp88px06ug.exe	89
PID 2576 wrote to memory of 3760	2576	tmp88px06ug.exe	91
PID 3760 wrote to memory of 2060	3760	cmd.exe	93
PID 4752 wrote to memory of 4936	4752	cmd.exe	94
PID 3760 wrote to memory of 3008	3760	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\tmp88px06ug.exe
"C:\Users\Admin\AppData\Local\Temp\tmp88px06ug.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2576
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "t4tirq" /tr '"C:\Users\Admin\AppData\Roaming\t4tirq.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4752
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "t4tirq" /tr '"C:\Users\Admin\AppData\Roaming\t4tirq.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4936
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp1B24.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3760
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2060
- - C:\Users\Admin\AppData\Roaming\t4tirq.exe
    "C:\Users\Admin\AppData\Roaming\t4tirq.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:3008

C:\Users\Admin\AppData\Roaming\t4tirq.exe
"C:\Users\Admin\AppData\Roaming\t4tirq.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:1672

Network

MITRE ATT&CK Enterprise v16

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

tmp1B24.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp1B24.tmp.bat
Size 150B
SHA256 acdfc3562b739e3004519c55593323ed5c909eb3a36bc7097cafca28a8b739a0
MD5 1a5583649c7c7a16fc07c1af253e1dc2
SHA1 c0053dce96e3aa06d6a8f03caf20e5e162d75eff
SHA512 5d3059fddac72d0ff1769a0e3aee29f247def5583f6e271f0da6285e4e0a44f2da6cbc8341d059ff1f1200092fb95d9d4e039f11815a56d3975e1a901033ba84
TLSH
T1ACC02B9252C5FA4F2C09681303FAD8CD9172BC1D3F40BB00C704445E62C045CF4ED381
MD5 SHA1 SHA512 TLSH

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t4tirq.exe

Path C:\Users\Admin\AppData\Roaming\t4tirq.exe
Size 45KB
SHA256 27126bcf10d8c1397aacbc9ccbcc7334874d92a52932ed33c786325454e0e37d
MD5 c0eaebf86fb963c0f94b7ab0b49304a5
SHA1 28c63a652ca35834977fd6356b8ce14267747461
SHA512 b22cf950b1ba44936c2a6ce4a15e05e8714ff90dfca5efaa030c381ed20d7c4af649f9a4c56bfb0b39c06a51ad1a050d01601a9c955633fe1b042f084f5a7562
SSDEEP 768:puNA/9T85LafWUzvSdmo2qIm/cYssPJZOPIcvzjbOgXZio29I8kVFOi3BDZ7x:puNA/9T8p72CMIf3cv3bxXo3IHVFOix/
TLSH
T109232C003BD8822BF1BE4F7899F26145467AF2673603D58E1CC451DB5613FC6DA42AED
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1672-10-0x0000000005550000-0x0000000005560000-memory.dmp

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memory/1672-13-0x0000000005550000-0x0000000005560000-memory.dmp

Download

memory/2576-0-0x00000000000A0000-0x00000000000B2000-memory.dmp

Download

memory/2576-1-0x0000000004A90000-0x0000000004AA0000-memory.dmp

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memory/2576-2-0x0000000004AA0000-0x0000000004B3C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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