asyncrat | 72b2cd81acb88e14d1f0a3cb660e48a78deaecac9135f762b838cd41fbc8c6fc

General

Target
tgteru.exe
Size 47KB
Sample261003-pha9wazth1
SHA256 72b2cd81acb88e14d1f0a3cb660e48a78deaecac9135f762b838cd41fbc8c6fc
MD5 c4911b45ca4bfeee9cb940cc2b8696c3
SHA1 1f53ed19e8941ea62fcac94854dc669f210942c4
SHA512 93cf83cc489ae2190bd2e34646ea3f90f5116285c34928d48eb1d44c4d09a33f5a018545c6defc1d0ec5a4742f998921df575214b99b72f835125151a25615b8
SSDEEP 768:0uYHKTsufqG9vSLjWUvlPRmo2qbgo6+TsH11YWPI2Y0bg5OogVy4VpO9cOnYVBDo:0uYHKTsjMvSX246+U1Q2Tbg59I89Y7dO
TLSH
T184233B0037E8816BF2BE5F78ACF22245857BE6673603D54D2CC452D75623BC29A426FE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

tg88seru.me defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

tg88seru.me

C2

tg88seru.me:443

Mutex

rDZfQpKYKbLA

Attributes

delay
3
install
true
install_file
ChromeUpdate.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 1 IoCs

rat

resource	yara_rule
behavioral1/files/0x00070000000248b6-9.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-1-5-21-2091445952-3649787497-104050984-1000\Control Panel\International\Geo\Nation	tgteru.exe

Executes dropped EXE 2 IoCs

pid	Process
1280	ChromeUpdate.exe
1188	ChromeUpdate.exe

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

System Information Discovery
T1082

Executes a command shell one-liner 1 TTPs 2 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
2540	cmd.exe
5332	cmd.exe

Reads the TCP/IP host and domain name from the registry 1 TTPs 4 IoCs

The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

discovery

System Network Configuration Discovery

T1016

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	tgteru.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	tgteru.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname	ChromeUpdate.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain	ChromeUpdate.exe

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	ChromeUpdate.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	tgteru.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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ChromeUpdate.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
5556	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
1824	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
4680	tgteru.exe
4680	tgteru.exe
4680	tgteru.exe
4680	tgteru.exe
4680	tgteru.exe
4680	tgteru.exe
4680	tgteru.exe
4680	tgteru.exe
4680	tgteru.exe
4680	tgteru.exe
4680	tgteru.exe
4680	tgteru.exe
4680	tgteru.exe
4680	tgteru.exe
4680	tgteru.exe
4680	tgteru.exe
4680	tgteru.exe
4680	tgteru.exe
4680	tgteru.exe
4680	tgteru.exe
4680	tgteru.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4680	tgteru.exe
Token: SeDebugPrivilege	1280	ChromeUpdate.exe
Token: SeDebugPrivilege	1280	ChromeUpdate.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4680 wrote to memory of 2540	4680	tgteru.exe	88
PID 4680 wrote to memory of 5332	4680	tgteru.exe	90
PID 5332 wrote to memory of 5556	5332	cmd.exe	92
PID 2540 wrote to memory of 1824	2540	cmd.exe	93
PID 5332 wrote to memory of 1188	5332	cmd.exe	102

C:\Users\Admin\AppData\Local\Temp\tgteru.exe
"C:\Users\Admin\AppData\Local\Temp\tgteru.exe"
1⤵
- Checks computer location settings
- Reads the TCP/IP host and domain name from the registry
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4680
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "ChromeUpdate" /tr '"C:\Users\Admin\AppData\Roaming\ChromeUpdate.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2540
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "ChromeUpdate" /tr '"C:\Users\Admin\AppData\Roaming\ChromeUpdate.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1824
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp1F94.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5332
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:5556
- - C:\Users\Admin\AppData\Roaming\ChromeUpdate.exe
    "C:\Users\Admin\AppData\Roaming\ChromeUpdate.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:1188

C:\Users\Admin\AppData\Roaming\ChromeUpdate.exe
"C:\Users\Admin\AppData\Roaming\ChromeUpdate.exe"
1⤵
- Executes dropped EXE
- Reads the TCP/IP host and domain name from the registry
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:1280

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

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

System Network Configuration Discovery

1

T1016

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

tmp1F94.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp1F94.tmp.bat
Size 156B
SHA256 e136101fe3ea4f51760617a8fdd7cd1494201a2b0bb3865d000497edcb12b99a
MD5 5be55f66cd52b05e096443e0ab83d167
SHA1 afdc8625aaea68808e9c55f35a8594b8470a22e4
SHA512 c64ee3e3ee750f2f94a033a8e8863a2c4c5b8ec26908a0165b0dda81b2b99dd372fbb913f330968f19f9a50263783cb3ad01c95c5d014301983658d550ee921c
TLSH
T144C08C4251C5EE5E2809641302BA948C96B26D5A3E49BB008304444A6280858E89D382
MD5 SHA1 SHA512 TLSH

Submit Download

ChromeUpdate.exe

Path C:\Users\Admin\AppData\Roaming\ChromeUpdate.exe
Size 47KB
SHA256 72b2cd81acb88e14d1f0a3cb660e48a78deaecac9135f762b838cd41fbc8c6fc
MD5 c4911b45ca4bfeee9cb940cc2b8696c3
SHA1 1f53ed19e8941ea62fcac94854dc669f210942c4
SHA512 93cf83cc489ae2190bd2e34646ea3f90f5116285c34928d48eb1d44c4d09a33f5a018545c6defc1d0ec5a4742f998921df575214b99b72f835125151a25615b8
SSDEEP 768:0uYHKTsufqG9vSLjWUvlPRmo2qbgo6+TsH11YWPI2Y0bg5OogVy4VpO9cOnYVBDo:0uYHKTsjMvSX246+U1Q2Tbg59I89Y7dO
TLSH
T184233B0037E8816BF2BE5F78ACF22245857BE6673603D54D2CC452D75623BC29A426FE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4680-0-0x0000000000010000-0x0000000000022000-memory.dmp

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memory/4680-1-0x0000000004A50000-0x0000000004A60000-memory.dmp

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memory/4680-2-0x00000000049A0000-0x0000000004A06000-memory.dmp

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memory/4680-3-0x0000000004E40000-0x0000000004EDC000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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