Malware Analysis Report

2024-10-10 10:00

Sample ID 240621-cxbgzawdjd
Target nezur update open first.exe
SHA256 586244c03ace07d74308daba5ce9d49ac2cde473e6c686aadc6e4b2627e5093c
Tags
umbral execution spyware stealer
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

586244c03ace07d74308daba5ce9d49ac2cde473e6c686aadc6e4b2627e5093c

Threat Level: Known bad

The file nezur update open first.exe was found to be: Known bad.

Malicious Activity Summary

umbral execution spyware stealer

Detect Umbral payload

Umbral family

Umbral

Command and Scripting Interpreter: PowerShell

Drops file in Drivers directory

Reads user/profile data of web browsers

Looks up external IP address via web service

Legitimate hosting services abused for malware hosting/C2

Unsigned PE

Suspicious behavior: EnumeratesProcesses

Detects videocard installed

Views/modifies file attributes

Suspicious use of WriteProcessMemory

Runs ping.exe

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-06-21 02:26

Signatures

Detect Umbral payload

Description Indicator Process Target
N/A N/A N/A N/A

Umbral family

umbral

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-21 02:26

Reported

2024-06-21 02:29

Platform

win10v2004-20240611-en

Max time kernel

148s

Max time network

152s

Command Line

"C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe"

Signatures

Detect Umbral payload

Description Indicator Process Target
N/A N/A N/A N/A

Umbral

stealer umbral

Command and Scripting Interpreter: PowerShell

execution
Description Indicator Process Target
N/A N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A

Drops file in Drivers directory

Description Indicator Process Target
File opened for modification C:\Windows\System32\drivers\etc\hosts C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe N/A

Reads user/profile data of web browsers

spyware stealer

Legitimate hosting services abused for malware hosting/C2

Description Indicator Process Target
N/A discord.com N/A N/A
N/A discord.com N/A N/A

Looks up external IP address via web service

Description Indicator Process Target
N/A ip-api.com N/A N/A

Detects videocard installed

Description Indicator Process Target
N/A N/A C:\Windows\System32\Wbem\wmic.exe N/A

Runs ping.exe

Description Indicator Process Target
N/A N/A C:\Windows\system32\PING.EXE N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe N/A
Token: SeIncreaseQuotaPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeSecurityPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeTakeOwnershipPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeLoadDriverPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeSystemProfilePrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeSystemtimePrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeProfSingleProcessPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeCreatePagefilePrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeBackupPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeRestorePrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeSystemEnvironmentPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeRemoteShutdownPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeUndockPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeManageVolumePrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: 33 N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: 34 N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: 35 N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: 36 N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeIncreaseQuotaPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeSecurityPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeTakeOwnershipPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeLoadDriverPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeSystemProfilePrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeSystemtimePrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeProfSingleProcessPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeCreatePagefilePrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeBackupPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeRestorePrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeSystemEnvironmentPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeRemoteShutdownPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeUndockPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeManageVolumePrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: 33 N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: 34 N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: 35 N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: 36 N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeIncreaseQuotaPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeSecurityPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeTakeOwnershipPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeLoadDriverPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeSystemProfilePrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeSystemtimePrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeProfSingleProcessPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeCreatePagefilePrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeBackupPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeRestorePrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeSystemEnvironmentPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeRemoteShutdownPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeUndockPrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A
Token: SeManageVolumePrivilege N/A C:\Windows\System32\Wbem\wmic.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 4664 wrote to memory of 3452 N/A C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe C:\Windows\System32\Wbem\wmic.exe
PID 4664 wrote to memory of 3452 N/A C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe C:\Windows\System32\Wbem\wmic.exe
PID 4664 wrote to memory of 2992 N/A C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe C:\Windows\SYSTEM32\attrib.exe
PID 4664 wrote to memory of 2992 N/A C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe C:\Windows\SYSTEM32\attrib.exe
PID 4664 wrote to memory of 3572 N/A C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 4664 wrote to memory of 3572 N/A C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 4664 wrote to memory of 5056 N/A C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 4664 wrote to memory of 5056 N/A C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 4664 wrote to memory of 1836 N/A C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 4664 wrote to memory of 1836 N/A C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 4664 wrote to memory of 4672 N/A C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 4664 wrote to memory of 4672 N/A C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 4664 wrote to memory of 1912 N/A C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe C:\Windows\System32\Wbem\wmic.exe
PID 4664 wrote to memory of 1912 N/A C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe C:\Windows\System32\Wbem\wmic.exe
PID 4664 wrote to memory of 1376 N/A C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe C:\Windows\System32\Wbem\wmic.exe
PID 4664 wrote to memory of 1376 N/A C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe C:\Windows\System32\Wbem\wmic.exe
PID 4664 wrote to memory of 320 N/A C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe C:\Windows\System32\Wbem\wmic.exe
PID 4664 wrote to memory of 320 N/A C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe C:\Windows\System32\Wbem\wmic.exe
PID 4664 wrote to memory of 1476 N/A C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 4664 wrote to memory of 1476 N/A C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 4664 wrote to memory of 5096 N/A C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe C:\Windows\System32\Wbem\wmic.exe
PID 4664 wrote to memory of 5096 N/A C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe C:\Windows\System32\Wbem\wmic.exe
PID 4664 wrote to memory of 924 N/A C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe C:\Windows\SYSTEM32\cmd.exe
PID 4664 wrote to memory of 924 N/A C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe C:\Windows\SYSTEM32\cmd.exe
PID 924 wrote to memory of 1764 N/A C:\Windows\SYSTEM32\cmd.exe C:\Windows\system32\PING.EXE
PID 924 wrote to memory of 1764 N/A C:\Windows\SYSTEM32\cmd.exe C:\Windows\system32\PING.EXE

Views/modifies file attributes

evasion
Description Indicator Process Target
N/A N/A C:\Windows\SYSTEM32\attrib.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe

"C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe"

C:\Windows\System32\Wbem\wmic.exe

"wmic.exe" csproduct get uuid

C:\Windows\SYSTEM32\attrib.exe

"attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe"

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

"powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe'

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

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

"powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

"powershell.exe" Get-ItemPropertyValue -Path HKLN:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY

C:\Windows\System32\Wbem\wmic.exe

"wmic.exe" os get Caption

C:\Windows\System32\Wbem\wmic.exe

"wmic.exe" computersystem get totalphysicalmemory

C:\Windows\System32\Wbem\wmic.exe

"wmic.exe" csproduct get uuid

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

"powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER

C:\Windows\System32\Wbem\wmic.exe

"wmic" path win32_VideoController get name

C:\Windows\SYSTEM32\cmd.exe

"cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\nezur update open first.exe" && pause

C:\Windows\system32\PING.EXE

ping localhost

Network

Country Destination Domain Proto
US 8.8.8.8:53 gstatic.com udp
GB 172.217.16.227:443 gstatic.com tcp
US 8.8.8.8:53 ip-api.com udp
US 208.95.112.1:80 ip-api.com tcp
US 8.8.8.8:53 227.16.217.172.in-addr.arpa udp
US 8.8.8.8:53 58.55.71.13.in-addr.arpa udp
US 8.8.8.8:53 1.112.95.208.in-addr.arpa udp
US 8.8.8.8:53 144.107.17.2.in-addr.arpa udp
US 8.8.8.8:53 68.32.126.40.in-addr.arpa udp
US 208.95.112.1:80 ip-api.com tcp
US 8.8.8.8:53 57.169.31.20.in-addr.arpa udp
NL 23.62.61.97:443 www.bing.com tcp
US 8.8.8.8:53 discord.com udp
US 162.159.135.232:443 discord.com tcp
US 8.8.8.8:53 97.61.62.23.in-addr.arpa udp
US 8.8.8.8:53 232.135.159.162.in-addr.arpa udp
US 8.8.8.8:53 149.220.183.52.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 0.205.248.87.in-addr.arpa udp
US 8.8.8.8:53 203.107.17.2.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 21.236.111.52.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 43.58.199.20.in-addr.arpa udp
US 8.8.8.8:53 10.28.171.150.in-addr.arpa udp

Files

memory/4664-1-0x00007FFA61A73000-0x00007FFA61A75000-memory.dmp

memory/4664-0-0x000002E0EBC60000-0x000002E0EBCA0000-memory.dmp

memory/4664-2-0x00007FFA61A70000-0x00007FFA62531000-memory.dmp

memory/3572-3-0x00007FFA61A70000-0x00007FFA62531000-memory.dmp

memory/3572-9-0x0000027318560000-0x0000027318582000-memory.dmp

memory/3572-14-0x00007FFA61A70000-0x00007FFA62531000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_xtxsg1xm.0tt.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/3572-15-0x00007FFA61A70000-0x00007FFA62531000-memory.dmp

memory/3572-18-0x00007FFA61A70000-0x00007FFA62531000-memory.dmp

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

MD5 d85ba6ff808d9e5444a4b369f5bc2730
SHA1 31aa9d96590fff6981b315e0b391b575e4c0804a
SHA256 84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f
SHA512 8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

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

MD5 77d622bb1a5b250869a3238b9bc1402b
SHA1 d47f4003c2554b9dfc4c16f22460b331886b191b
SHA256 f97ff12a8abf4bf88bb6497bd2ac2da12628c8847a8ba5a9026bdbb76507cdfb
SHA512 d6789b5499f23c9035375a102271e17a8a82e57d6f5312fa24242e08a83efdeb8becb7622f55c4cf1b89c7d864b445df11f4d994cf7e2f87a900535bcca12fd9

memory/4664-33-0x000002E0EE390000-0x000002E0EE406000-memory.dmp

memory/4664-34-0x000002E0EE490000-0x000002E0EE4E0000-memory.dmp

memory/4664-35-0x000002E0EE440000-0x000002E0EE45E000-memory.dmp

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

MD5 985b3105d8889886d6fd953575c54e08
SHA1 0f9a041240a344d82bac0a180520e7982c15f3cd
SHA256 5178fdd457eb3eb25c8f72ed4c22c582a83de0d324db66d0446d660f226e944d
SHA512 0fd59bc4886b70aa3b7eeeaa23229b7fdc93410ca7f8452860e4a1bbda2559eaa5e4b05c3ec2d85f7d648daf3c16741f4c2c18f2dd3bae4cc4a4e57ae4f665b0

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

MD5 276798eeb29a49dc6e199768bc9c2e71
SHA1 5fdc8ccb897ac2df7476fbb07517aca5b7a6205b
SHA256 cd0a1056e8f1b6cb5cb328532239d802f4e2aa8f8fcdc0fcb487684bd68e0dcc
SHA512 0d34fce64bbefc57d64fa6e03ca886952263d5f24df9c1c4cce6a1e8f5a47a9a21e9820f8d38caa7f7b43a52336ce00b738ea18419aaa7c788b72e04ce19e4f2

memory/4664-72-0x000002E0EE340000-0x000002E0EE34A000-memory.dmp

memory/4664-73-0x000002E0EE370000-0x000002E0EE382000-memory.dmp

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

MD5 cb711d82584fe3dc5745bfb99820569f
SHA1 429adfe731c69d9cbf3b52653e1988c14b0b9d0c
SHA256 2191f862ec40511db0dddc17ca49a894b91a3bde6dff599eb64f58a0aef79856
SHA512 51c85e4a327ac74a37d981771de1fa5621191f05513dd931fa7056a6af77aa44e93debd882592784f76da37815e03f620d8314333d9ea0e193e4d5ea424dfd5a

memory/4664-93-0x00007FFA61A70000-0x00007FFA62531000-memory.dmp