8ac15f82a2bb641c962e25e2d50c83697a544218b80da5e4378b8f6ad4f86dc2

General

Target

63679243c47c8c9690b42098778611c0N.exe
Size

21KB
MD5

63679243c47c8c9690b42098778611c0
SHA1

ec59c9fc2e5a18114f0abde2e3ea99510897a56b
SHA256

8ac15f82a2bb641c962e25e2d50c83697a544218b80da5e4378b8f6ad4f86dc2
SHA512

f8385fa201d92443675dce1efcab89b824544abc4663152717c1765d023b79310495f2dd0f467a238be2aa6144915120d54d4079d125c7335c67d8ded8748a54
SSDEEP

384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvX6S3k5i:rRkiLw3HsDSARGG/qS3yi

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

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\{5250584F-4351-5246-5250-584F43515246}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{5250584F-4351-5246-5250-584F43515246}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{5250584F-4351-5246-5250-584F43515246}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{5250584F-4351-5246-5250-584F43515246}\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
2784	rmass.exe
2736	rmass.exe

Loads dropped DLL 3 IoCs

pid	Process
2780	63679243c47c8c9690b42098778611c0N.exe
2780	63679243c47c8c9690b42098778611c0N.exe
2784	rmass.exe

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2780-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x000a000000012029-12.dat	upx
behavioral1/memory/2780-11-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2736-25-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2784-13-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2784-59-0x0000000000400000-0x0000000000411000-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\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

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	63679243c47c8c9690b42098778611c0N.exe
File created	C:\Windows\SysWOW64\rmass.exe	63679243c47c8c9690b42098778611c0N.exe
File opened for modification	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
File opened for modification	C:\Windows\SysWOW64\aset32.exe	rmass.exe
File created	C:\Windows\SysWOW64\ntdbg.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\idbg32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.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\aset32.exe	rmass.exe
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

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2784	rmass.exe
2784	rmass.exe
2784	rmass.exe
2736	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2780	63679243c47c8c9690b42098778611c0N.exe
Token: SeDebugPrivilege	2784	rmass.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2780 wrote to memory of 2784	2780	63679243c47c8c9690b42098778611c0N.exe	31
PID 2780 wrote to memory of 2784	2780	63679243c47c8c9690b42098778611c0N.exe	31
PID 2780 wrote to memory of 2784	2780	63679243c47c8c9690b42098778611c0N.exe	31
PID 2780 wrote to memory of 2784	2780	63679243c47c8c9690b42098778611c0N.exe	31
PID 2784 wrote to memory of 432	2784	rmass.exe	5
PID 2784 wrote to memory of 1232	2784	rmass.exe	21
PID 2784 wrote to memory of 2736	2784	rmass.exe	32
PID 2784 wrote to memory of 2736	2784	rmass.exe	32
PID 2784 wrote to memory of 2736	2784	rmass.exe	32
PID 2784 wrote to memory of 2736	2784	rmass.exe	32

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:432

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1232
- C:\Users\Admin\AppData\Local\Temp\63679243c47c8c9690b42098778611c0N.exe
  "C:\Users\Admin\AppData\Local\Temp\63679243c47c8c9690b42098778611c0N.exe"
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2780
- - 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
    - 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:2784
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:2736

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
00ec08539ee63bbc069978d9d2262092

SHA1
4d88ce31d5414f63d6665ad8ede50591bb605687

SHA256
e78a107303d39f995019757487f452b080f1d8aa170ad3141eba0b8f96a61897

SHA512
8a7490e398a2b185b9a0f02ac1532d3d179ec83972cf99c8b4fddfa1f2e0d6d3bbc8e0433185d839bc5521995dcdbf7ca93d456da7144b3c76a477f75729ffb0

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

Filesize
24KB

MD5
a5260a607b6228e2fb7ee07a571695af

SHA1
7e3c020e3ffef41a71b13f33006f09de3ae8daad

SHA256
8e016e168c16e447839c3186a3b64606be1587657c71312bdfb960c8b3ca1989

SHA512
a8b1910bed141cd26a5f5e07eca0c14ae2146bf02b8ee047d8c06d6289cd67bc9dc49a9cb52107d199533b5fdb80b83b2c5e2ac4d9b9a5ba082346a5f774df9f

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

Filesize
21KB

MD5
63679243c47c8c9690b42098778611c0

SHA1
ec59c9fc2e5a18114f0abde2e3ea99510897a56b

SHA256
8ac15f82a2bb641c962e25e2d50c83697a544218b80da5e4378b8f6ad4f86dc2

SHA512
f8385fa201d92443675dce1efcab89b824544abc4663152717c1765d023b79310495f2dd0f467a238be2aa6144915120d54d4079d125c7335c67d8ded8748a54

Download Submit
memory/2736-25-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2780-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2780-11-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2784-13-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2784-59-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads