38402c6d1ea91a564a88d031cccb0d79df5018c6c60d21309e41f2d574d7e125

General

Target

38402c6d1ea91a564a88d031cccb0d79df5018c6c60d21309e41f2d574d7e125.exe
Size

63KB
MD5

5ca310ac6c5dc495fd4121698cd93a36
SHA1

c07a58dbe7a9979e9ce6a328cc6fa0e68eb67885
SHA256

38402c6d1ea91a564a88d031cccb0d79df5018c6c60d21309e41f2d574d7e125
SHA512

f76fcaae3f7b69a186245e33877073190216cd0b10f79cbbc5a47d2fbe638c24db00926a6b22bba0c5c6a6bdb080b85f6a1e2ab54af39bcae5f88e58b319bc1f
SSDEEP

768:rAUJmQCcmLCXQq6fsKiJYsIkjJVzqsVG5kuGKQLddOW/24WvgMb7rAl:sUNHFKQbIkHvGMdOp4Zu7Ml

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\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

Drops file in Drivers directory 1 IoCs

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

Modifies Installed Components in the registry 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4249534D-495a-4858-4249-534D495A4858}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4249534D-495a-4858-4249-534D495A4858}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4249534D-495a-4858-4249-534D495A4858}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	rmass.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4249534D-495a-4858-4249-534D495A4858}	rmass.exe

Sets file execution options in registry 2 TTPs 3 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

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
1320	rmass.exe
2996	rmass.exe

Loads dropped DLL 3 IoCs

pid	Process
2156	38402c6d1ea91a564a88d031cccb0d79df5018c6c60d21309e41f2d574d7e125.exe
2156	38402c6d1ea91a564a88d031cccb0d79df5018c6c60d21309e41f2d574d7e125.exe
1320	rmass.exe

UPX packed file 7 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2156-0-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral1/files/0x000c00000001225d-4.dat	upx
behavioral1/memory/2156-5-0x0000000000320000-0x0000000000332000-memory.dmp	upx
behavioral1/memory/2156-12-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral1/memory/1320-13-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral1/memory/1320-86-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral1/memory/2996-97-0x0000000000400000-0x0000000000412000-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
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\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 opened for modification	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\aset32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	38402c6d1ea91a564a88d031cccb0d79df5018c6c60d21309e41f2d574d7e125.exe
File created	C:\Windows\SysWOW64\rmass.exe	38402c6d1ea91a564a88d031cccb0d79df5018c6c60d21309e41f2d574d7e125.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\ahuy.exe	rmass.exe
File created	C:\Windows\SysWOW64\RECOVER32.DLL	rmass.exe

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

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1320	rmass.exe
1320	rmass.exe
1320	rmass.exe
2996	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2156	38402c6d1ea91a564a88d031cccb0d79df5018c6c60d21309e41f2d574d7e125.exe
Token: SeDebugPrivilege	1320	rmass.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2156 wrote to memory of 1320	2156	38402c6d1ea91a564a88d031cccb0d79df5018c6c60d21309e41f2d574d7e125.exe	28
PID 2156 wrote to memory of 1320	2156	38402c6d1ea91a564a88d031cccb0d79df5018c6c60d21309e41f2d574d7e125.exe	28
PID 2156 wrote to memory of 1320	2156	38402c6d1ea91a564a88d031cccb0d79df5018c6c60d21309e41f2d574d7e125.exe	28
PID 2156 wrote to memory of 1320	2156	38402c6d1ea91a564a88d031cccb0d79df5018c6c60d21309e41f2d574d7e125.exe	28
PID 1320 wrote to memory of 436	1320	rmass.exe	5
PID 1320 wrote to memory of 1124	1320	rmass.exe	20
PID 1320 wrote to memory of 2996	1320	rmass.exe	29
PID 1320 wrote to memory of 2996	1320	rmass.exe	29
PID 1320 wrote to memory of 2996	1320	rmass.exe	29
PID 1320 wrote to memory of 2996	1320	rmass.exe	29

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:436

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1124
- C:\Users\Admin\AppData\Local\Temp\38402c6d1ea91a564a88d031cccb0d79df5018c6c60d21309e41f2d574d7e125.exe
  "C:\Users\Admin\AppData\Local\Temp\38402c6d1ea91a564a88d031cccb0d79df5018c6c60d21309e41f2d574d7e125.exe"
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2156
- - C:\Windows\SysWOW64\rmass.exe
    "C:\Windows\system32\rmass.exe"
    3⤵
    - Windows security bypass
    - Drops file in Drivers directory
    - Modifies Installed Components in the registry
    - Sets file execution options in registry
    - Executes dropped EXE
    - Loads dropped DLL
    - 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:1320
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:2996

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

3

T1547

Registry Run Keys / Startup Folder

2

T1547.001

Winlogon Helper DLL

1

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

3

T1547

Registry Run Keys / Startup Folder

2

T1547.001

Winlogon Helper DLL

1

T1547.004

Defense Evasion

Impair Defenses

2

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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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
65KB

MD5
a3921fc7daaba8add4f242a87664dec5

SHA1
ed59e7afe8ceada707ff8b1dc058b653d353d6f2

SHA256
13c067e53984a14c5c3afe9fafbf3a7dba210cc1c33ca367f21a7b41a1d556e4

SHA512
2487b5de63e3f9f1fc17104a7939497479a8252e4c0e59e6b8bdc2f3d7362006f556dd32dc1443d3dd71975bd2cacfddfb3b0d66396d87e74ff2c14b4862a439

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

Filesize
66KB

MD5
d2bcc80db29a36f91892e3c8ac62ddde

SHA1
c79d9d7e58c30da5acb01c7de2b57aa3a1c3247b

SHA256
03b28a26f5436a04dbde075bbe7dc4681385979692995a3ba333d172ef2db349

SHA512
a1ceeb0c4a5e7e62e31efcd3830368821626fb9a2fe77e2d7b05d2be5fe903bf57c20aa2415b0dd2f18d6c6668559d320b8156dba6ecd767b2ff32cf6e2a88e2

Download Submit
C:\Windows\System32\drivers\etc\hosts

Filesize
1KB

MD5
b10b13206b0f2cf3968050072f6979bf

SHA1
699db21ba9cecf3f13ac3d76e22cfa41aa94da80

SHA256
0eef3217095cb97b695c434e74d6314bf9e869a013d6e9c88e58c34576a276b4

SHA512
d33bfd931be6676539507a69101d99fa4c5ef36b12422bd11f063b9b6a47b7444f6c4ad5f35e044714fdb872e96cd9fddf049e8329af1219483887f6ac5f4a5d

Download Submit
\Windows\SysWOW64\rmass.exe

Filesize
63KB

MD5
5ca310ac6c5dc495fd4121698cd93a36

SHA1
c07a58dbe7a9979e9ce6a328cc6fa0e68eb67885

SHA256
38402c6d1ea91a564a88d031cccb0d79df5018c6c60d21309e41f2d574d7e125

SHA512
f76fcaae3f7b69a186245e33877073190216cd0b10f79cbbc5a47d2fbe638c24db00926a6b22bba0c5c6a6bdb080b85f6a1e2ab54af39bcae5f88e58b319bc1f

Download Submit
memory/1320-86-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1320-25-0x0000000000360000-0x0000000000372000-memory.dmp

Filesize
72KB

Download
memory/1320-13-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1320-96-0x0000000000360000-0x0000000000372000-memory.dmp

Filesize
72KB

Download
memory/2156-12-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2156-0-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2156-5-0x0000000000320000-0x0000000000332000-memory.dmp

Filesize
72KB

Download
memory/2996-97-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads