62873cbb54fef0c67b3c4a040f97a77454aac807fdbc3769d1d6fd8478d2a3fd

General

Target

5cc3954b150e8a2c48f8357f56ee1050N.exe
Size

21KB
MD5

5cc3954b150e8a2c48f8357f56ee1050
SHA1

3aeba689d4a925db8502729b0c50e662fc2e990b
SHA256

62873cbb54fef0c67b3c4a040f97a77454aac807fdbc3769d1d6fd8478d2a3fd
SHA512

74235f6f4c59a70a2eb39489206c2986601a87ad48abb65033ec5cfc76e593fc72bec168d979af84651f6844b362a0db127717a4b1b54f207a95b1c34132ba21
SSDEEP

384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvXfI2hZ4:rRkiLw3HsDSARGG/g2hZ4

Score

10^/10

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\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
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusOverride = "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
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{5950494D-4649-594c-5950-494D4649594c}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{5950494D-4649-594c-5950-494D4649594c}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{5950494D-4649-594c-5950-494D4649594c}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	rmass.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{5950494D-4649-594c-5950-494D4649594c}	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
4900	rmass.exe
3476	rmass.exe

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4640-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/files/0x000900000002349a-6.dat	upx
behavioral2/memory/4640-8-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/4900-12-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/4900-52-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/3476-53-0x0000000000400000-0x0000000000411000-memory.dmp	upx

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

Modifies WinLogon 2 TTPs 5 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
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
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

Drops file in System32 directory 12 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\ahuy.exe	rmass.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 created	C:\Windows\SysWOW64\rmass.exe	5cc3954b150e8a2c48f8357f56ee1050N.exe
File opened for modification	C:\Windows\SysWOW64\ntdbg.exe	rmass.exe
File created	C:\Windows\SysWOW64\RECOVER32.DLL	rmass.exe
File opened for modification	C:\Windows\SysWOW64\winrnt.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	5cc3954b150e8a2c48f8357f56ee1050N.exe
File created	C:\Windows\SysWOW64\ntdbg.exe	rmass.exe

Drops file in Program Files directory 3 IoCs

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

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
4900	rmass.exe
4900	rmass.exe
4900	rmass.exe
4900	rmass.exe
4900	rmass.exe
4900	rmass.exe
3476	rmass.exe
3476	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4640	5cc3954b150e8a2c48f8357f56ee1050N.exe
Token: SeDebugPrivilege	4900	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4640 wrote to memory of 4900	4640	5cc3954b150e8a2c48f8357f56ee1050N.exe	84
PID 4640 wrote to memory of 4900	4640	5cc3954b150e8a2c48f8357f56ee1050N.exe	84
PID 4640 wrote to memory of 4900	4640	5cc3954b150e8a2c48f8357f56ee1050N.exe	84
PID 4900 wrote to memory of 608	4900	rmass.exe	5
PID 4900 wrote to memory of 3444	4900	rmass.exe	56
PID 4900 wrote to memory of 3476	4900	rmass.exe	85
PID 4900 wrote to memory of 3476	4900	rmass.exe	85
PID 4900 wrote to memory of 3476	4900	rmass.exe	85

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:608

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3444
- C:\Users\Admin\AppData\Local\Temp\5cc3954b150e8a2c48f8357f56ee1050N.exe
  "C:\Users\Admin\AppData\Local\Temp\5cc3954b150e8a2c48f8357f56ee1050N.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4640
- - C:\Windows\SysWOW64\rmass.exe
    "C:\Windows\system32\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
    - Modifies WinLogon
    - Drops file in System32 directory
    - Drops file in Program Files directory
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:4900
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:3476

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

2

T1547

Active Setup

1

T1547.014

Winlogon Helper DLL

1

T1547.004

Event Triggered Execution

1

T1546

Image File Execution Options Injection

1

T1546.012

Privilege Escalation

Boot or Logon Autostart Execution

2

T1547

Active Setup

1

T1547.014

Winlogon Helper DLL

1

T1547.004

Event Triggered Execution

1

T1546

Image File Execution Options Injection

1

T1546.012

Defense Evasion

Impair Defenses

2

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Windows\SysWOW64\RECOVER32.DLL

Filesize
5KB

MD5
2b2c28a7a01f9584fe220ef84003427f

SHA1
5fc023df0b5064045eb8de7f2dbe26f07f6fec70

SHA256
9e00af53b1d0c0f5270d94a666d95aa7b4dcb9fea49487c210c055c9dcfcc9eb

SHA512
39192a8a91dec1abff25af8dac0cf39da4dfd51b3fb4f1ef0b4e776185d4280fbe8387c2ea778da7bbf2ce288b0bce4d23cbe8d9e87bbd250159044f5adbac78

Download Submit
C:\Windows\SysWOW64\ahuy.exe

Filesize
23KB

MD5
428ce9eb780fde0bac599f2f6f46cffd

SHA1
dc2abde80bde76e6f28b7012a476d98e43fca6f8

SHA256
9af9c019157d051d204624b4f59bac3712937cd4a37dea1fb2a75a52cb349544

SHA512
574b37c60d68b45f2d093bca12e1cf4ff96d01735dd6efed071d6a3dff648d2234713de664cdb50b59b2a6fe7fb715a20ba956ee911c0551ceb1dfc07a1edf2b

Download Submit
C:\Windows\SysWOW64\ntdbg.exe

Filesize
24KB

MD5
f33c9d9c631117e6ae2932e7616a5175

SHA1
1d784830bd54950362466fb7c6f1ee01760e3a14

SHA256
461d424fe55bf567f220a829ce932c29e6362336b31fc254a729688b3f1a1813

SHA512
c7691e721282731a6eed1d9880d68d0ef5155e21a9c2c8a24a2f7e8a212dc954c3d05c3f2dcea69cbc52afd91fad9f805ca9ab890bfd7f8924d1deb00fd31f7b

Download Submit
C:\Windows\SysWOW64\rmass.exe

Filesize
21KB

MD5
5cc3954b150e8a2c48f8357f56ee1050

SHA1
3aeba689d4a925db8502729b0c50e662fc2e990b

SHA256
62873cbb54fef0c67b3c4a040f97a77454aac807fdbc3769d1d6fd8478d2a3fd

SHA512
74235f6f4c59a70a2eb39489206c2986601a87ad48abb65033ec5cfc76e593fc72bec168d979af84651f6844b362a0db127717a4b1b54f207a95b1c34132ba21

Download Submit
memory/3476-53-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4640-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4640-8-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4900-12-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4900-52-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads