asyncrat | 10202f0fd6a60f0a0fba0c1f6cc945d49b4d63092732cb9a57f191b7355e7748

General

Target
mko2.exe
Size 47KB
Sample260710-sdlrladx9x
SHA256 10202f0fd6a60f0a0fba0c1f6cc945d49b4d63092732cb9a57f191b7355e7748
MD5 bcb773acf14d7fbdaaaa022834111582
SHA1 5d95315a2a3a7f19e420ab22b816393201f1e312
SHA512 0f7dad22152a192108f1d4d1efef4fb933c14d3d7a7fdac5b84d0b83b6a5d9cb7c668549466c893baa7e5eb5e1f169f81e64facacef5af6899960a33ac65c093
SSDEEP 768:kuiWNTdFHLBWUZzGrmo2qrIMt4JiOGAZ1DfkVVPIdaMO0B0bDJ3OYoAYPR0402r+:kuiWNTdB+2AKYeZ1DsVydaMbWbDJ3Ho4
TLSH
T143234D007BE9812BF27E4F7898F2224586BAF2673703D64D1DC442D75623FC2CA525EA
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

555win-vn01.site:8443
555win-vn01.site:81
555win-vn01.site:7878
555win-vn01.site:8787
555win-vn01.site:6789
555win-vn01.site:80
555win-vn01.site:8080
555win-vn01.site:443
k7o.uk.net:8443
k7o.uk.net:81
k7o.uk.net:7878
k7o.uk.net:8787
k7o.uk.net:6789
k7o.uk.net:80
k7o.uk.net:8080
k7o.uk.net:443

Mutex

S4LNVFZLLdyX

Attributes

delay
3
install
true
install_file
svchost.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/0x0008000000024481-9.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-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	mko2.exe

Executes dropped EXE 2 IoCs

pid	Process
940	svchost.exe
4868	svchost.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	mko2.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	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
2068	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
1488	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
4368	mko2.exe
4368	mko2.exe
4368	mko2.exe
4368	mko2.exe
4368	mko2.exe
4368	mko2.exe
4368	mko2.exe
4368	mko2.exe
4368	mko2.exe
4368	mko2.exe
4368	mko2.exe
4368	mko2.exe
4368	mko2.exe
4368	mko2.exe
4368	mko2.exe
4368	mko2.exe
4368	mko2.exe
4368	mko2.exe
4368	mko2.exe
4368	mko2.exe
4368	mko2.exe
4368	mko2.exe
4368	mko2.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4368	mko2.exe
Token: SeDebugPrivilege	940	svchost.exe
Token: SeDebugPrivilege	940	svchost.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4368 wrote to memory of 2624	4368	mko2.exe	87
PID 4368 wrote to memory of 1596	4368	mko2.exe	89
PID 1596 wrote to memory of 2068	1596	cmd.exe	91
PID 2624 wrote to memory of 1488	2624	cmd.exe	92
PID 1596 wrote to memory of 4868	1596	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\mko2.exe
"C:\Users\Admin\AppData\Local\Temp\mko2.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4368
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2624
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1488
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpEA1.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1596
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2068
- - C:\Users\Admin\AppData\Roaming\svchost.exe
    "C:\Users\Admin\AppData\Roaming\svchost.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:4868

C:\Users\Admin\AppData\Roaming\svchost.exe
"C:\Users\Admin\AppData\Roaming\svchost.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:940

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

tmpEA1.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmpEA1.tmp.bat
Size 150B
SHA256 cbf3f0ab88e8bee4a7c348bc757c68949958c4d457bf94ca19ed619dfaa5059e
MD5 d4433a118de99ee1816e7c5e59ae6bab
SHA1 0bdd36978d1122cac4e305aad622ad65112f1e5a
SHA512 3f1fa71246edf6ec929e4e4df06db1064d7d71c77fd89334f310d5cafda324fbb7cd34ac58a98c4220120d6d1c2e937c26f41dbd592d04e3c1733ef7d13f358a
TLSH
T17EC02B4251C6EA0E3805149302FAD48D92B26C2D3F44BF84C345801D23C045CF4EB342
MD5 SHA1 SHA512 TLSH

Submit Download

svchost.exe

Path C:\Users\Admin\AppData\Roaming\svchost.exe
Size 47KB
SHA256 10202f0fd6a60f0a0fba0c1f6cc945d49b4d63092732cb9a57f191b7355e7748
MD5 bcb773acf14d7fbdaaaa022834111582
SHA1 5d95315a2a3a7f19e420ab22b816393201f1e312
SHA512 0f7dad22152a192108f1d4d1efef4fb933c14d3d7a7fdac5b84d0b83b6a5d9cb7c668549466c893baa7e5eb5e1f169f81e64facacef5af6899960a33ac65c093
SSDEEP 768:kuiWNTdFHLBWUZzGrmo2qrIMt4JiOGAZ1DfkVVPIdaMO0B0bDJ3OYoAYPR0402r+:kuiWNTdB+2AKYeZ1DsVydaMbWbDJ3Ho4
TLSH
T143234D007BE9812BF27E4F7898F2224586BAF2673703D64D1DC442D75623FC2CA525EA
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/4368-0-0x0000000000A00000-0x0000000000A12000-memory.dmp

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memory/4368-1-0x00000000053E0000-0x00000000053F0000-memory.dmp

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memory/4368-2-0x00000000053F0000-0x0000000005456000-memory.dmp

Download

memory/4368-3-0x0000000005820000-0x00000000058BC000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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