56e4d764d0d1f8501580405cfc15e900912b97053532e472da197ebf08ccd0d5

Analysis

max time kernel
149s
max time network
137s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
12/11/2024, 22:21

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General

Target
56e4d764d0d1f8501580405cfc15e900912b97053532e472da197ebf08ccd0d5.exe
Size 23KB
Sample241112-191vdsserf
SHA256 56e4d764d0d1f8501580405cfc15e900912b97053532e472da197ebf08ccd0d5
MD5 c0be0077ce4a3717c83dc3018a7549d9
SHA1 2562e792f7a1737632fe44dbbc5810e73fb1d39e
SHA512 1180e8e485fd9f37506499857b6d82152a9176d5b871c7584c46a7c4e129a07647833ae4f2579deedab46994d982e00f1c70d6cdda5b5bcb7e444999df87ca60
SSDEEP 384:jIz4qSFyuIsPgKBTmL3cf4OAkBEZCXeLp9HjwB1DI3ReAnOJ380v1:jIUnyuIwdSLcQpICvXwB12nOJ380v1
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

defense_evasion discovery evasion persistence trojan upx

Malware Config

Signatures

Windows security bypass 2 TTPs 4 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\FirewallDisableNotify = "5120"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UpdatesDisableNotify = "5120"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusOverride = "5120"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "5120"	rmass.exe

Boot or Logon Autostart Execution: Active Setup 2 TTPs 4 IoCs

Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

persistence

Active Setup

T1547.014

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47554D4C-4e4c-4645-4755-4D4C4E4C4645}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47554D4C-4e4c-4645-4755-4D4C4E4C4645}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47554D4C-4e4c-4645-4755-4D4C4E4C4645}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47554D4C-4e4c-4645-4755-4D4C4E4C4645}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	rmass.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\drivers\etc\hosts	rmass.exe

Event Triggered Execution: Image File Execution Options Injection 1 TTPs 3 IoCs

persistence

Image File Execution Options Injection

T1546.012

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe\0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890 = "a"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe\Debugger = "C:\\Windows\\system32\\ntdbg.exe"	rmass.exe

Executes dropped EXE 2 IoCs

pid	Process
632	rmass.exe
4176	rmass.exe

Windows security modification 2 TTPs 4 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusOverride = "5120"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "5120"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\FirewallDisableNotify = "5120"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UpdatesDisableNotify = "5120"	rmass.exe

Indicator Removal: Clear Persistence 1 TTPs 1 IoCs

remove IFEO.

defense_evasion

Clear Persistence

T1070.009

description	ioc	Process
Delete value	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe\Debugger	rmass.exe

Modifies WinLogon 2 TTPs 5 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\{BC84DF00-BC38-9902-8082-6FCBF2D87A0B}	rmass.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\{BC84DF00-BC38-9902-8082-6FCBF2D87A0B}\012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345 = "a"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\{BC84DF00-BC38-9902-8082-6FCBF2D87A0B}\DLLName = "C:\\Windows\\system32\\RECOVER32.DLL"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\{BC84DF00-BC38-9902-8082-6FCBF2D87A0B}\Startup = "Startup"	rmass.exe

Drops file in System32 directory 12 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\rmass.exe	56e4d764d0d1f8501580405cfc15e900912b97053532e472da197ebf08ccd0d5.exe
File created	C:\Windows\SysWOW64\ahuy.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\RECOVER32.DLL	rmass.exe
File opened for modification	C:\Windows\SysWOW64\aset32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\idbg32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	rmass.exe
File created	C:\Windows\SysWOW64\rmass.exe	56e4d764d0d1f8501580405cfc15e900912b97053532e472da197ebf08ccd0d5.exe
File opened for modification	C:\Windows\SysWOW64\ntdbg.exe	rmass.exe
File created	C:\Windows\SysWOW64\ntdbg.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\ahuy.exe	rmass.exe
File created	C:\Windows\SysWOW64\RECOVER32.DLL	rmass.exe
File opened for modification	C:\Windows\SysWOW64\winrnt.exe	rmass.exe

UPX packed file 4 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/files/0x0008000000023c82-4.dat	upx
behavioral2/memory/632-3-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/632-39-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/4176-44-0x0000000000400000-0x0000000000411000-memory.dmp	upx

Drops file in Program Files directory 3 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Common Files\System\winrnt.exe	rmass.exe
File opened for modification	C:\Program Files (x86)\Common Files\System\aset32.exe	rmass.exe
File opened for modification	C:\Program Files (x86)\Common Files\System\idbg32.exe	rmass.exe

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	56e4d764d0d1f8501580405cfc15e900912b97053532e472da197ebf08ccd0d5.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rmass.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
632	rmass.exe
632	rmass.exe
632	rmass.exe
632	rmass.exe
632	rmass.exe
632	rmass.exe
4176	rmass.exe
4176	rmass.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	632	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1656 wrote to memory of 632	1656	56e4d764d0d1f8501580405cfc15e900912b97053532e472da197ebf08ccd0d5.exe	83
PID 1656 wrote to memory of 632	1656	56e4d764d0d1f8501580405cfc15e900912b97053532e472da197ebf08ccd0d5.exe	83
PID 1656 wrote to memory of 632	1656	56e4d764d0d1f8501580405cfc15e900912b97053532e472da197ebf08ccd0d5.exe	83
PID 632 wrote to memory of 4176	632	rmass.exe	84
PID 632 wrote to memory of 4176	632	rmass.exe	84
PID 632 wrote to memory of 4176	632	rmass.exe	84
PID 632 wrote to memory of 616	632	rmass.exe	5
PID 632 wrote to memory of 3520	632	rmass.exe	56

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:616

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3520
- C:\Users\Admin\AppData\Local\Temp\56e4d764d0d1f8501580405cfc15e900912b97053532e472da197ebf08ccd0d5.exe
  "C:\Users\Admin\AppData\Local\Temp\56e4d764d0d1f8501580405cfc15e900912b97053532e472da197ebf08ccd0d5.exe"
  2⤵
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1656
- - C:\Windows\SysWOW64\rmass.exe
    "C:\Windows\SysWOW64\rmass.exe"
    3⤵
    - Windows security bypass
    - Boot or Logon Autostart Execution: Active Setup
    - Drops file in Drivers directory
    - Event Triggered Execution: Image File Execution Options Injection
    - Executes dropped EXE
    - Windows security modification
    - Indicator Removal: Clear Persistence
    - Modifies WinLogon
    - Drops file in System32 directory
    - Drops file in Program Files directory
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:632
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:4176

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Active Setup

T1547.014

Winlogon Helper DLL

T1547.004

Event Triggered Execution

T1546

Image File Execution Options Injection

T1546.012

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Active Setup

T1547.014

Winlogon Helper DLL

T1547.004

Event Triggered Execution

T1546

Image File Execution Options Injection

T1546.012

Defense Evasion

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Indicator Removal

T1070

Clear Persistence

T1070.009

Modify Registry

T1112

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

RECOVER32.DLL

Path C:\Windows\SysWOW64\RECOVER32.DLL
Size 5KB
SHA256 9e00af53b1d0c0f5270d94a666d95aa7b4dcb9fea49487c210c055c9dcfcc9eb
MD5 2b2c28a7a01f9584fe220ef84003427f
SHA1 5fc023df0b5064045eb8de7f2dbe26f07f6fec70
SHA512 39192a8a91dec1abff25af8dac0cf39da4dfd51b3fb4f1ef0b4e776185d4280fbe8387c2ea778da7bbf2ce288b0bce4d23cbe8d9e87bbd250159044f5adbac78
SSDEEP 48:6CsrGV5e2/WJbm73k2vZcsrkqSq2cxc2G5ZwJOFl:SqV5Roa73kQ/kqqAD
MD5 SHA1 SHA512 SSDEEP

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ahuy.exe

Path C:\Windows\SysWOW64\ahuy.exe
Size 23KB
SHA256 d60985a0d9ddc4b71a81a757773e9f7d25db88c49ab10ca3b127419910638c88
MD5 0f55acaa1df5a46798f60a7fe5b0301c
SHA1 067e969125bed50c3300222bcb1b103d119d8ef2
SHA512 6cd06fc794fcc695d7ad81f75ddfe1324aa304cd3329d9c5f5b8e75ea64ce05dba98ba1079af2600d6424fe546abb64334af4a4bd3049780bb1a182e1506929c
SSDEEP 384:jIz4ZCxvJX0i51sPtGQVr/c5gFI0wGnDUvzeEWKYDj2t1HygHcO2:jIUZmJEioXB/cu9wUDUvqEWKY81HnHa
MD5 SHA1 SHA512 SSDEEP

Submit Download

ntdbg.exe

Path C:\Windows\SysWOW64\ntdbg.exe
Size 24KB
SHA256 b3ecab5cf9ebc671d5473392b4d650e722743bbb54aa8b87523d1adc67b1697c
MD5 3d804bfd130d95cf2348a83db1318f1b
SHA1 de0b0d71c229340b43e431aced15c693481c9eae
SHA512 c00e8804fd7b603f250ea7ed9114a76b1c7e896badaa4ec58c9499175c372cd7142156dc429f915a9021907d0bc81d6bbf15ecf9a8c2fef9cd9dae298c0a3fe3
SSDEEP 384:ErzPZnmAXvK14dirr4tGjSz28MrHI0nTfSPt1rzMjkj8r6V+AGZj5P3J:ErzFXvKadiQi8MLdbAt1QO8rezGZL
MD5 SHA1 SHA512 SSDEEP

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rmass.exe

Path C:\Windows\SysWOW64\rmass.exe
Size 21KB
SHA256 1a08c408679b2febe55df0768ff9eeb65fc48f6e3c04859aa9fe1b7287bc6c68
MD5 a4ac57ed25a2f158847c40fac3523a1d
SHA1 69d4d85f55ff3fcc4bc30c4add138fd2d86ad7a0
SHA512 a43dc8ab4b5315176515e248758bec6a66da174dc2f9daa0292b290792870d37574e7a9b3c07fc86e9ba326910475fa3e9811d4fb54bb3f3b0b40fa26c6d747b
SSDEEP 384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvXAhX:rRkiLw3HsDSARGG/Q1
MD5 SHA1 SHA512 SSDEEP

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hosts

Path C:\Windows\System32\drivers\etc\hosts
Size 1KB
SHA256 15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4
MD5 6f47b62de25d1745e296a06b3f98ed19
SHA1 a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f
SHA512 dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7
MD5 SHA1 SHA512

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memory/632-3-0x0000000000400000-0x0000000000411000-memory.dmp

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memory/632-39-0x0000000000400000-0x0000000000411000-memory.dmp

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memory/1656-5-0x0000000000400000-0x0000000000403000-memory.dmp

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memory/4176-44-0x0000000000400000-0x0000000000411000-memory.dmp

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