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\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

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
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{52484154-5145-4451-5248-415451454451}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{52484154-5145-4451-5248-415451454451}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{52484154-5145-4451-5248-415451454451}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{52484154-5145-4451-5248-415451454451}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	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
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe\Debugger = "C:\\Windows\\system32\\ntdbg.exe"	rmass.exe
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

Executes dropped EXE 2 IoCs

pid	Process
2604	rmass.exe
376	rmass.exe

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral2/memory/3948-0-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral2/memory/3948-6-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral2/files/0x000a0000000233de-7.dat	upx
behavioral2/memory/2604-9-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral2/memory/376-18-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral2/memory/2604-52-0x0000000000400000-0x0000000000412000-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\rmass.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\idbg32.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\ahuy.exe	rmass.exe
File created	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\rmass.exe	38402c6d1ea91a564a88d031cccb0d79df5018c6c60d21309e41f2d574d7e125.exe
File created	C:\Windows\SysWOW64\rmass.exe	38402c6d1ea91a564a88d031cccb0d79df5018c6c60d21309e41f2d574d7e125.exe
File opened for modification	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\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 8 IoCs

pid	Process
2604	rmass.exe
2604	rmass.exe
2604	rmass.exe
2604	rmass.exe
2604	rmass.exe
2604	rmass.exe
376	rmass.exe
376	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3948	38402c6d1ea91a564a88d031cccb0d79df5018c6c60d21309e41f2d574d7e125.exe
Token: SeDebugPrivilege	2604	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 3948 wrote to memory of 2604	3948	38402c6d1ea91a564a88d031cccb0d79df5018c6c60d21309e41f2d574d7e125.exe	82
PID 3948 wrote to memory of 2604	3948	38402c6d1ea91a564a88d031cccb0d79df5018c6c60d21309e41f2d574d7e125.exe	82
PID 3948 wrote to memory of 2604	3948	38402c6d1ea91a564a88d031cccb0d79df5018c6c60d21309e41f2d574d7e125.exe	82
PID 2604 wrote to memory of 616	2604	rmass.exe	5
PID 2604 wrote to memory of 3472	2604	rmass.exe	56
PID 2604 wrote to memory of 376	2604	rmass.exe	83
PID 2604 wrote to memory of 376	2604	rmass.exe	83
PID 2604 wrote to memory of 376	2604	rmass.exe	83

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

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3472
- C:\Users\Admin\AppData\Local\Temp\38402c6d1ea91a564a88d031cccb0d79df5018c6c60d21309e41f2d574d7e125.exe
  "C:\Users\Admin\AppData\Local\Temp\38402c6d1ea91a564a88d031cccb0d79df5018c6c60d21309e41f2d574d7e125.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3948
- - 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
    - 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:2604
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:376

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

Replay Monitor

Loading Replay Monitor...

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
594582a037e0c67afae11e04b7985f68

SHA1
5ea099b15743ca86fdb5f94d8b4441188fa700e7

SHA256
d9aad7465a6f461e81057871abc72146861e489ebc8c56388a4ca0eb6b40c0c3

SHA512
bde7cc51993692b57da8ced01bfcdba9aeea84fad0568f1d234537cf30d27508182c009617dfce20cb589c40c29b2c3e0c53f1248c3523ca5644694365b65cd2

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

Filesize
66KB

MD5
0fbd97556a12ca25479f1a6d8f69edb0

SHA1
69fe48121922e5a973260c30f905573b7a0a43d7

SHA256
c6b5e6741d6934b049f1e9a32895241a372e09ff8a065250e68cf2d0dda45fc8

SHA512
123ff729549150e52ac0c80066d5329106ad668d326813c44891dd1a6a9d93398ffeb4630726363286ddce7bb3a9af147a65e29fbf9a4c1283b9c000f05da0da

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

Filesize
63KB

MD5
5ca310ac6c5dc495fd4121698cd93a36

SHA1
c07a58dbe7a9979e9ce6a328cc6fa0e68eb67885

SHA256
38402c6d1ea91a564a88d031cccb0d79df5018c6c60d21309e41f2d574d7e125

SHA512
f76fcaae3f7b69a186245e33877073190216cd0b10f79cbbc5a47d2fbe638c24db00926a6b22bba0c5c6a6bdb080b85f6a1e2ab54af39bcae5f88e58b319bc1f

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

Filesize
1KB

MD5
6f47b62de25d1745e296a06b3f98ed19

SHA1
a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f

SHA256
15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4

SHA512
dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7

Download Submit
memory/376-18-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2604-9-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2604-52-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/3948-0-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/3948-6-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads