glupteba | aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90

Analysis

max time kernel
149s
max time network
155s
platform
windows11-21h2_x64
resource
win11-20240508-en
resource tags

arch:x64arch:x86image:win11-20240508-enlocale:en-usos:windows11-21h2-x64system
submitted
16/05/2024, 12:25

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General

Target
aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
Size 4.1MB
Sample240516-pllvsacc8s
SHA256 aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90
MD5 7265cf8743bdb57794cac01203b98da7
SHA1 65f2853ec106f7864a2307b2628c9637ad1a8b94
SHA512 a030f4eca8f2054bf3a8b2040f41f22f539342aab0d1128808e81196fe1b02ee7d5c0b4af460782bc251a2390988e582ee4067b0abb3a1c98146ea8af39093ce
SSDEEP 98304:l/lx2VB4FLDQS1OmkYbRsTncIxTvyO2P5x7YbDUU85:VlgkYS1OmbburVLyO2P5x7Yb4D
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

glupteba discovery dropper evasion execution loader persistence rootkit

Malware Config

Signatures

Glupteba
Glupteba is a modular loader written in Golang with various components.
loader dropper glupteba

Glupteba payload 17 IoCs

resource	yara_rule
behavioral2/memory/1928-2-0x0000000002E20000-0x000000000370B000-memory.dmp	family_glupteba
behavioral2/memory/1928-3-0x0000000000400000-0x0000000000D1C000-memory.dmp	family_glupteba
behavioral2/memory/1928-52-0x0000000002E20000-0x000000000370B000-memory.dmp	family_glupteba
behavioral2/memory/1928-75-0x0000000000400000-0x0000000000D1C000-memory.dmp	family_glupteba
behavioral2/memory/1616-125-0x0000000000400000-0x0000000000D1C000-memory.dmp	family_glupteba
behavioral2/memory/4004-200-0x0000000000400000-0x0000000000D1C000-memory.dmp	family_glupteba
behavioral2/memory/4004-202-0x0000000000400000-0x0000000000D1C000-memory.dmp	family_glupteba
behavioral2/memory/4004-204-0x0000000000400000-0x0000000000D1C000-memory.dmp	family_glupteba
behavioral2/memory/4004-206-0x0000000000400000-0x0000000000D1C000-memory.dmp	family_glupteba
behavioral2/memory/4004-208-0x0000000000400000-0x0000000000D1C000-memory.dmp	family_glupteba
behavioral2/memory/4004-210-0x0000000000400000-0x0000000000D1C000-memory.dmp	family_glupteba
behavioral2/memory/4004-212-0x0000000000400000-0x0000000000D1C000-memory.dmp	family_glupteba
behavioral2/memory/4004-214-0x0000000000400000-0x0000000000D1C000-memory.dmp	family_glupteba
behavioral2/memory/4004-216-0x0000000000400000-0x0000000000D1C000-memory.dmp	family_glupteba
behavioral2/memory/4004-218-0x0000000000400000-0x0000000000D1C000-memory.dmp	family_glupteba
behavioral2/memory/4004-220-0x0000000000400000-0x0000000000D1C000-memory.dmp	family_glupteba
behavioral2/memory/4004-222-0x0000000000400000-0x0000000000D1C000-memory.dmp	family_glupteba

Modifies Windows Firewall 2 TTPs 1 IoCs

evasion

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

pid	Process
1488	netsh.exe

Executes dropped EXE 2 IoCs

pid	Process
4004	csrss.exe
1332	injector.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2457560273-69882387-977367775-1000\Software\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Windows\\rss\\csrss.exe\""	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2457560273-69882387-977367775-1000\Software\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Windows\\rss\\csrss.exe\""	csrss.exe

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Manipulates WinMonFS driver. 1 IoCs

Roottkits write to WinMonFS to hide directories/files from being detected.

rootkit evasion

description	ioc	Process
File opened for modification	\??\WinMonFS	csrss.exe

Drops file in System32 directory 7 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log	powershell.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-Interactive	powershell.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-Interactive	powershell.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-Interactive	powershell.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-Interactive	powershell.exe
File opened for modification	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-Interactive	powershell.exe
File created	C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-Interactive	powershell.exe

Checks for VirtualBox DLLs, possible anti-VM trick 1 TTPs 1 IoCs

Certain files are specific to VirtualBox VMs and can be used to detect execution in a VM.

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\VBoxMiniRdrDN	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\rss	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
File created	C:\Windows\rss\csrss.exe	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 7 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
3884	powershell.exe
2012	powershell.exe
2424	powershell.exe
4848	powershell.exe
4888	powershell.exe
3488	powershell.exe
4568	powershell.exe

Creates scheduled task(s) 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
432	schtasks.exe
3024	schtasks.exe

Modifies data under HKEY_USERS 64 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\2a\52C64B7E\C:\Windows\system32\,@tzres.dll,-2842 = "Saratov Standard Time"	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\CRLs	powershell.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\2a\52C64B7E\C:\Windows\system32\,@tzres.dll,-692 = "Tasmania Standard Time"	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\2a\52C64B7E\C:\Windows\system32\,@tzres.dll,-932 = "Coordinated Universal Time"	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople	powershell.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\2a\52C64B7E\C:\Windows\system32\,@tzres.dll,-449 = "Azerbaijan Standard Time"	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\2a\52C64B7E\C:\Windows\system32\,@tzres.dll,-681 = "E. Australia Daylight Time"	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\2a\52C64B7E\C:\Windows\system32\,@tzres.dll,-232 = "Hawaiian Standard Time"	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust	powershell.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot	powershell.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\2a\52C64B7E\C:\Windows\system32\,@tzres.dll,-891 = "Morocco Daylight Time"	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\2a\52C64B7E\C:\Windows\system32\,@tzres.dll,-2791 = "Novosibirsk Daylight Time"	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot	powershell.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\Certificates	powershell.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\2a\52C64B7E\C:\Windows\system32\,@tzres.dll,-2792 = "Novosibirsk Standard Time"	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\2a\52C64B7E\C:\Windows\system32\,@tzres.dll,-2632 = "Norfolk Standard Time"	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\	powershell.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\2a\52C64B7E\C:\Windows\system32\,@tzres.dll,-1412 = "Syria Standard Time"	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\CTLs	powershell.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\CRLs	powershell.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root\Certificates	powershell.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\Disallowed\CRLs	powershell.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\Certificates	powershell.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\Certificates	powershell.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA	powershell.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA	powershell.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\Certificates	powershell.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\Certificates	powershell.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\CRLs	powershell.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\CA\Certificates	powershell.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\CRLs	powershell.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Root	powershell.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\CRLs	powershell.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\CRLs	powershell.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\Disallowed\Certificates	powershell.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\2a\52C64B7E\C:\Windows\system32\,@tzres.dll,-331 = "E. Europe Daylight Time"	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\2a\52C64B7E\C:\Windows\system32\,@tzres.dll,-1911 = "Russia TZ 10 Daylight Time"	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\2a\52C64B7E\C:\Windows\system32\,@tzres.dll,-1411 = "Syria Daylight Time"	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot	powershell.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\CRLs	powershell.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\UNCAsIntranet = "1"	powershell.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\2a\52C64B7E\C:\Windows\system32\,@tzres.dll,-2182 = "Astrakhan Standard Time"	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\2a\52C64B7E\C:\Windows\system32\,@tzres.dll,-1832 = "Russia TZ 2 Standard Time"	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust\CRLs	powershell.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\2a\52C64B7E\C:\Windows\system32\,@tzres.dll,-2592 = "Tocantins Standard Time"	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\SmartCardRoot\CTLs	powershell.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople	powershell.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\TrustedPeople\CTLs	powershell.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\2a\52C64B7E\C:\Windows\system32\,@tzres.dll,-982 = "Kamchatka Standard Time"	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\2a\52C64B7E\C:\Windows\system32\,@tzres.dll,-2891 = "Sudan Daylight Time"	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\Certificates	powershell.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\Certificates	powershell.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA	powershell.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\2a\52C64B7E\C:\Windows\system32\,@tzres.dll,-362 = "GTB Standard Time"	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\SystemCertificates\trust	powershell.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\CA\CTLs	powershell.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust\Certificates	powershell.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\trust	powershell.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\2a\52C64B7E\C:\Windows\system32\,@tzres.dll,-662 = "Cen. Australia Standard Time"	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\2a\52C64B7E\C:\Windows\system32\,@tzres.dll,-2432 = "Cuba Standard Time"	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\2a\52C64B7E\C:\Windows\system32\,@tzres.dll,-1471 = "Magadan Daylight Time"	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Policies\Microsoft\SystemCertificates\TrustedPeople\CRLs	powershell.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\2a\52C64B7E\C:\Windows\system32\,@tzres.dll,-341 = "Egypt Daylight Time"	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
Set value (str)	\REGISTRY\USER\.DEFAULT\Software\Classes\Local Settings\MuiCache\2a\52C64B7E\C:\Windows\system32\,@tzres.dll,-961 = "Paraguay Daylight Time"	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
4848	powershell.exe
4848	powershell.exe
1928	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
1928	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
4888	powershell.exe
4888	powershell.exe
1616	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
1616	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
1616	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
1616	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
1616	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
1616	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
1616	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
1616	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
1616	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
1616	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
3488	powershell.exe
3488	powershell.exe
4568	powershell.exe
4568	powershell.exe
3884	powershell.exe
3884	powershell.exe
2012	powershell.exe
2012	powershell.exe
2424	powershell.exe
2424	powershell.exe
1332	injector.exe
1332	injector.exe
1332	injector.exe
1332	injector.exe
1332	injector.exe
1332	injector.exe
4004	csrss.exe
4004	csrss.exe
1332	injector.exe
1332	injector.exe
1332	injector.exe
1332	injector.exe
1332	injector.exe
1332	injector.exe
4004	csrss.exe
4004	csrss.exe
1332	injector.exe
1332	injector.exe
1332	injector.exe
1332	injector.exe
1332	injector.exe
1332	injector.exe
1332	injector.exe
1332	injector.exe
1332	injector.exe
1332	injector.exe
1332	injector.exe
1332	injector.exe
1332	injector.exe
1332	injector.exe
1332	injector.exe
1332	injector.exe
1332	injector.exe
1332	injector.exe
1332	injector.exe
1332	injector.exe
1332	injector.exe
1332	injector.exe

Suspicious use of AdjustPrivilegeToken 10 IoCs

description	pid	Process
Token: SeDebugPrivilege	4848	powershell.exe
Token: SeDebugPrivilege	1928	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
Token: SeImpersonatePrivilege	1928	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
Token: SeDebugPrivilege	4888	powershell.exe
Token: SeDebugPrivilege	3488	powershell.exe
Token: SeDebugPrivilege	4568	powershell.exe
Token: SeDebugPrivilege	3884	powershell.exe
Token: SeDebugPrivilege	2012	powershell.exe
Token: SeDebugPrivilege	2424	powershell.exe
Token: SeSystemEnvironmentPrivilege	4004	csrss.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 1928 wrote to memory of 4848	1928	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe	78
PID 1928 wrote to memory of 4848	1928	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe	78
PID 1928 wrote to memory of 4848	1928	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe	78
PID 1616 wrote to memory of 4888	1616	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe	83
PID 1616 wrote to memory of 4888	1616	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe	83
PID 1616 wrote to memory of 4888	1616	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe	83
PID 1616 wrote to memory of 3628	1616	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe	85
PID 1616 wrote to memory of 3628	1616	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe	85
PID 3628 wrote to memory of 1488	3628	cmd.exe	87
PID 3628 wrote to memory of 1488	3628	cmd.exe	87
PID 1616 wrote to memory of 3488	1616	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe	88
PID 1616 wrote to memory of 3488	1616	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe	88
PID 1616 wrote to memory of 3488	1616	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe	88
PID 1616 wrote to memory of 4568	1616	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe	90
PID 1616 wrote to memory of 4568	1616	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe	90
PID 1616 wrote to memory of 4568	1616	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe	90
PID 1616 wrote to memory of 4004	1616	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe	92
PID 1616 wrote to memory of 4004	1616	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe	92
PID 1616 wrote to memory of 4004	1616	aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe	92
PID 4004 wrote to memory of 3884	4004	csrss.exe	93
PID 4004 wrote to memory of 3884	4004	csrss.exe	93
PID 4004 wrote to memory of 3884	4004	csrss.exe	93
PID 4004 wrote to memory of 2012	4004	csrss.exe	99
PID 4004 wrote to memory of 2012	4004	csrss.exe	99
PID 4004 wrote to memory of 2012	4004	csrss.exe	99
PID 4004 wrote to memory of 2424	4004	csrss.exe	101
PID 4004 wrote to memory of 2424	4004	csrss.exe	101
PID 4004 wrote to memory of 2424	4004	csrss.exe	101
PID 4004 wrote to memory of 1332	4004	csrss.exe	103
PID 4004 wrote to memory of 1332	4004	csrss.exe	103

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\aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
"C:\Users\Admin\AppData\Local\Temp\aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1928
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  powershell -nologo -noprofile
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4848
- C:\Users\Admin\AppData\Local\Temp\aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe
  "C:\Users\Admin\AppData\Local\Temp\aeee6c8b711783647d26fc58daeef0a3927e0dc611bf14300ed75ca16f772f90.exe"
  2⤵
  - Adds Run key to start application
  - Checks for VirtualBox DLLs, possible anti-VM trick
  - Drops file in Windows directory
  - Modifies data under HKEY_USERS
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:1616
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    powershell -nologo -noprofile
    3⤵
    - Drops file in System32 directory
    - Command and Scripting Interpreter: PowerShell
    - Modifies data under HKEY_USERS
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4888
- - C:\Windows\system32\cmd.exe
    C:\Windows\Sysnative\cmd.exe /C "netsh advfirewall firewall add rule name="csrss" dir=in action=allow program="C:\Windows\rss\csrss.exe" enable=yes"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3628
  - - C:\Windows\system32\netsh.exe
      netsh advfirewall firewall add rule name="csrss" dir=in action=allow program="C:\Windows\rss\csrss.exe" enable=yes
      4⤵
      Modifies Windows Firewall
      PID:1488
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    powershell -nologo -noprofile
    3⤵
    - Drops file in System32 directory
    - Command and Scripting Interpreter: PowerShell
    - Modifies data under HKEY_USERS
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3488
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    powershell -nologo -noprofile
    3⤵
    - Drops file in System32 directory
    - Command and Scripting Interpreter: PowerShell
    - Modifies data under HKEY_USERS
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4568
- - C:\Windows\rss\csrss.exe
    C:\Windows\rss\csrss.exe
    3⤵
    - Executes dropped EXE
    - Adds Run key to start application
    - Manipulates WinMonFS driver.
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:4004
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      powershell -nologo -noprofile
      4⤵
      Drops file in System32 directory
      Command and Scripting Interpreter: PowerShell
      Modifies data under HKEY_USERS
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:3884
  - - C:\Windows\SYSTEM32\schtasks.exe
      schtasks /CREATE /SC ONLOGON /RL HIGHEST /TR "C:\Windows\rss\csrss.exe" /TN csrss /F
      4⤵
      Creates scheduled task(s)
      PID:432
  - - C:\Windows\SYSTEM32\schtasks.exe
      schtasks /delete /tn ScheduledUpdate /f
      4⤵
      PID:2028
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      powershell -nologo -noprofile
      4⤵
      Drops file in System32 directory
      Command and Scripting Interpreter: PowerShell
      Modifies data under HKEY_USERS
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:2012
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      powershell -nologo -noprofile
      4⤵
      Drops file in System32 directory
      Command and Scripting Interpreter: PowerShell
      Modifies data under HKEY_USERS
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:2424
  - - C:\Users\Admin\AppData\Local\Temp\csrss\injector\injector.exe
      C:\Users\Admin\AppData\Local\Temp\csrss\injector\injector.exe taskmgr.exe C:\Users\Admin\AppData\Local\Temp\csrss\injector\NtQuerySystemInformationHook.dll
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:1332
  - - C:\Windows\SYSTEM32\schtasks.exe
      schtasks /CREATE /SC ONLOGON /RL HIGHEST /TR "C:\Windows\rss\csrss.exe" /TN csrss /F
      4⤵
      Creates scheduled task(s)
      PID:3024

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

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Scheduled Task/Job

T1053

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Scheduled Task/Job

T1053

Defense Evasion

Impair Defenses

T1562

Disable or Modify System Firewall

T1562.004

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

__PSScriptPolicyTest_y5v5k0vy.ria.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_y5v5k0vy.ria.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
MD5 SHA1 SHA512

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injector.exe

Path C:\Users\Admin\AppData\Local\Temp\csrss\injector\injector.exe
Size 281KB
SHA256 5de4e2b07a26102fe527606ce5da1d5a4b938967c9d380a3c5fe86e2e34aaaf1
MD5 d98e33b66343e7c96158444127a117f6
SHA1 bb716c5509a2bf345c6c1152f6e3e1452d39d50d
SHA512 705275e4a1ba8205eb799a8cf1737bc8ba686925e52c9198a6060a7abeee65552a85b814ac494a4b975d496a63be285f19a6265550585f2fc85824c42d7efab5
SSDEEP 3072:qbHszDaOJ8u2HHFIWr6e29kOnK7qFQ8wMii5I7kGvNjzMuszHshoY46bEydJ+dK9:SA3IlIA6e29vngqS8wMmuooh8z+8F
MD5 SHA1 SHA512 SSDEEP

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powershell.exe.log

Path C:\Windows\SysWOW64\config\systemprofile\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log
Size 2KB
SHA256 9600b3fdf0565ccb49e21656aa4b24d7c18f776bfd04d9ee984b134707550f02
MD5 d0c46cad6c0778401e21910bd6b56b70
SHA1 7be418951ea96326aca445b8dfe449b2bfa0dca6
SHA512 057531b468f7fbbb2175a696a8aab274dec0d17d9f71df309edcff35e064f3378050066a3df47ccd03048fac461594ec75e3d4fe64f9dd79949d129f51e02949
MD5 SHA1 SHA512

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