limerat | 55268bd92f0f5ed2956d2e5a4cf0f583fd1036197be092c24236d5761752a6ed

General

Target

UserOOBEBroker.exe
Size

105.5MB
MD5

3ffa9625fdd39b7160430ec903cd2688
SHA1

2b07febc39ca067b234c1ab574477e459f1574af
SHA256

55268bd92f0f5ed2956d2e5a4cf0f583fd1036197be092c24236d5761752a6ed
SHA512

4e33c44c2e0a7c053c66c378a247ac48787d2f4de00316809d4619b9f09e302d6f0b34a1609667a820a568c2287383290dee8720d80470cc01c9e8d30fddeb9c
SSDEEP

786432:G7aJ7vCmorl0yxfYkyQdBFrJJSl62HjeqHUQvvozHjrxjLmSYbnk6Kno1hiX:

Score

10^/10

limerat xworm discovery execution persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

redslide133-49604.portmap.host:49604

wiz.bounceme.net:6000

Attributes

Install_directory
%ProgramData%
install_file
USB.exe
telegram
https://api.telegram.org/bot7245769901:AAG_37K7d0DlKNRIZshszMjtQDXRfUiSCa4/sendMessage?chat_id=6652235050

aes.plain

Extracted

Family

limerat

Attributes

antivm
false
c2_url
https://pastebin.com/raw/u8f09e5b
download_payload
false
install
false
pin_spread
false
usb_spread
false

Signatures

Detect Xworm Payload 3 IoCs

resource	yara_rule
behavioral1/files/0x00080000000234a5-20.dat	family_xworm
behavioral1/memory/3984-28-0x0000000000660000-0x000000000067C000-memory.dmp	family_xworm
behavioral1/memory/3984-78-0x000000001C3A0000-0x000000001C3AE000-memory.dmp	family_xworm

LimeRAT
Simple yet powerful RAT for Windows machines written in .NET.
rat limerat
Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm

Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
2260	powershell.exe
3800	powershell.exe
2068	powershell.exe

Checks computer location settings 2 TTPs 2 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-1-5-21-786284298-625481688-3210388970-1000\Control Panel\International\Geo\Nation	UserOOBEBroker.exe
Key value queried	\REGISTRY\USER\S-1-5-21-786284298-625481688-3210388970-1000\Control Panel\International\Geo\Nation	VCruntime.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\VCruntime.lnk	VCruntime.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\VCruntime.lnk	VCruntime.exe

Executes dropped EXE 3 IoCs

pid	Process
2876	wlanext.exe
3984	VCruntime.exe
4676	VCruntime.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-786284298-625481688-3210388970-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\VCruntime = "C:\\ProgramData\\VCruntime.exe"	VCruntime.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
29	pastebin.com
30	pastebin.com

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
22	ip-api.com

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

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
4172	848	WerFault.exe	83

System Location Discovery: System Language Discovery 1 TTPs 2 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	UserOOBEBroker.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wlanext.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
448	schtasks.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
3984	VCruntime.exe

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
2260	powershell.exe
2260	powershell.exe
3800	powershell.exe
3800	powershell.exe
2068	powershell.exe
2068	powershell.exe
3984	VCruntime.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	3984	VCruntime.exe
Token: SeDebugPrivilege	2260	powershell.exe
Token: SeDebugPrivilege	3800	powershell.exe
Token: SeDebugPrivilege	2068	powershell.exe
Token: SeDebugPrivilege	2876	wlanext.exe
Token: SeDebugPrivilege	2876	wlanext.exe
Token: SeDebugPrivilege	3984	VCruntime.exe
Token: SeDebugPrivilege	4676	VCruntime.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3984	VCruntime.exe

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 848 wrote to memory of 2876	848	UserOOBEBroker.exe	91
PID 848 wrote to memory of 2876	848	UserOOBEBroker.exe	91
PID 848 wrote to memory of 2876	848	UserOOBEBroker.exe	91
PID 848 wrote to memory of 3984	848	UserOOBEBroker.exe	92
PID 848 wrote to memory of 3984	848	UserOOBEBroker.exe	92
PID 3984 wrote to memory of 2260	3984	VCruntime.exe	97
PID 3984 wrote to memory of 2260	3984	VCruntime.exe	97
PID 3984 wrote to memory of 3800	3984	VCruntime.exe	99
PID 3984 wrote to memory of 3800	3984	VCruntime.exe	99
PID 3984 wrote to memory of 2068	3984	VCruntime.exe	101
PID 3984 wrote to memory of 2068	3984	VCruntime.exe	101
PID 3984 wrote to memory of 448	3984	VCruntime.exe	104
PID 3984 wrote to memory of 448	3984	VCruntime.exe	104

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:\Users\Admin\AppData\Local\Temp\UserOOBEBroker.exe
"C:\Users\Admin\AppData\Local\Temp\UserOOBEBroker.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:848
- C:\Users\Admin\AppData\Local\Temp\wlanext.exe
  "C:\Users\Admin\AppData\Local\Temp\wlanext.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  PID:2876
- C:\Users\Admin\AppData\Local\Temp\VCruntime.exe
  "C:\Users\Admin\AppData\Local\Temp\VCruntime.exe"
  2⤵
  - Checks computer location settings
  - Drops startup file
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious behavior: AddClipboardFormatListener
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3984
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\VCruntime.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2260
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'VCruntime.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3800
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\ProgramData\VCruntime.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2068
- - C:\Windows\System32\schtasks.exe
    "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "VCruntime" /tr "C:\ProgramData\VCruntime.exe"
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:448
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 848 -s 1604
  2⤵
  - Program crash
  PID:4172

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 848 -ip 848
1⤵
PID:4728

C:\ProgramData\VCruntime.exe
C:\ProgramData\VCruntime.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4676

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
6d42b6da621e8df5674e26b799c8e2aa

SHA1
ab3ce1327ea1eeedb987ec823d5e0cb146bafa48

SHA256
5ab6a1726f425c6d0158f55eb8d81754ddedd51e651aa0a899a29b7a58619c4c

SHA512
53faffbda8a835bc1143e894c118c15901a5fd09cfc2224dd2f754c06dc794897315049a579b9a8382d4564f071576045aaaf824019b7139d939152dca38ce29

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
e0aff9af890497944ecf6021b8cae272

SHA1
e12479a857b0306bb609a5bbf7f513bca32fb846

SHA256
cbb5b9787321f69957badedad4202b46f877a84c4fe9476243328d5fd934fa18

SHA512
92040aa745d19bb612c8c1b68172bafac32ad037c173807f551d5049a542f197f1fdbca6d39c3d7e79f528409851a60c7c8f9f26bb985d33036183818a2a25bb

Download Submit
C:\Users\Admin\AppData\Local\Temp\VCruntime.exe

Filesize
89KB

MD5
225850cf18d6e1256f70862fdbd6afb3

SHA1
f5b2d3b010eca4d84904a28f8fbc39c2f38a12b4

SHA256
69ca909fbad74b756b6094a69da49df464ff5d34b5362e7c19e0ae731c40fb0f

SHA512
54d2edd402a959b3790233f521baa06948abff801312fa3cc9b26486679dbf4af3ab8c7a64ebbd89c38f48925647cd3614e96764b60fe27853b185edf78fae6e

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ogf0j50k.ea1.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\wlanext.exe

Filesize
32KB

MD5
1a89346c2f5d142140070249972a2211

SHA1
dec0ec575a56e847843b4253c25861abfc23a898

SHA256
b54e2ca4b6324ac1579641c423ee06285590e780184d7a3df6ee0899d8499d9e

SHA512
cb78cc5ba228a73e3475812b6361817cf149c22eb644ffb70c56c92d726082400df951c4fbc2aa41d29280bf651e2636ff5390dc6fda3be36382f6436b19ad3c

Download Submit
memory/848-0-0x00000000752CE000-0x00000000752CF000-memory.dmp

Filesize
4KB

Download
memory/848-1-0x0000000000040000-0x0000000001040000-memory.dmp

Filesize
16.0MB

Download
memory/848-2-0x000000000B2A0000-0x000000000B33C000-memory.dmp

Filesize
624KB

Download
memory/848-4-0x000000001AC50000-0x000000001E118000-memory.dmp

Filesize
52.8MB

Download
memory/848-3-0x00000000752C0000-0x0000000075A70000-memory.dmp

Filesize
7.7MB

Download
memory/848-32-0x00000000752C0000-0x0000000075A70000-memory.dmp

Filesize
7.7MB

Download
memory/2260-34-0x000001EDC32B0000-0x000001EDC32D2000-memory.dmp

Filesize
136KB

Download
memory/2876-29-0x00000000711D2000-0x00000000711D3000-memory.dmp

Filesize
4KB

Download
memory/2876-31-0x00000000711D0000-0x0000000071781000-memory.dmp

Filesize
5.7MB

Download
memory/2876-30-0x00000000711D0000-0x0000000071781000-memory.dmp

Filesize
5.7MB

Download
memory/2876-81-0x00000000711D2000-0x00000000711D3000-memory.dmp

Filesize
4KB

Download
memory/2876-82-0x00000000711D0000-0x0000000071781000-memory.dmp

Filesize
5.7MB

Download
memory/3984-33-0x000000001B3C0000-0x000000001B3D0000-memory.dmp

Filesize
64KB

Download
memory/3984-28-0x0000000000660000-0x000000000067C000-memory.dmp

Filesize
112KB

Download
memory/3984-27-0x00007FFAA7143000-0x00007FFAA7145000-memory.dmp

Filesize
8KB

Download
memory/3984-77-0x000000001B8D0000-0x000000001B9D2000-memory.dmp

Filesize
1.0MB

Download
memory/3984-78-0x000000001C3A0000-0x000000001C3AE000-memory.dmp

Filesize
56KB

Download
memory/3984-80-0x00007FFAA7143000-0x00007FFAA7145000-memory.dmp

Filesize
8KB

Download
memory/3984-83-0x000000001B3C0000-0x000000001B3D0000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads