9e932649b42f6518a53d98e503bb409e3a13bf3ba417869c901913094e20f767

General

Target

c64f57f9b44d5aa023d7467c15d9218e.exe
Size

22KB
MD5

c64f57f9b44d5aa023d7467c15d9218e
SHA1

d7e5749bc0f9df75c7e5f1ffad1eea6908a81b00
SHA256

9e932649b42f6518a53d98e503bb409e3a13bf3ba417869c901913094e20f767
SHA512

36cbf8873faf73eede168c9a4146479ca7710f03b4b7a00a1cd57cc8fb04b229ce16cc2bb930939c47556c0f109c0f5890a090a31588f5d6bf52ec6efd770506
SSDEEP

384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvX8Mb7a6M0:rRkiLw3HsDSARGG/MMb7rH

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
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{53434647-4252-4254-5343-464742524254}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{53434647-4252-4254-5343-464742524254}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{53434647-4252-4254-5343-464742524254}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{53434647-4252-4254-5343-464742524254}\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
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
2740	rmass.exe
3024	rmass.exe

Loads dropped DLL 3 IoCs

pid	Process
2368	c64f57f9b44d5aa023d7467c15d9218e.exe
2368	c64f57f9b44d5aa023d7467c15d9218e.exe
2740	rmass.exe

UPX packed file 8 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2368-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x000b000000014b31-4.dat	upx
behavioral1/memory/2740-15-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2368-12-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2368-5-0x0000000000320000-0x0000000000331000-memory.dmp	upx
behavioral1/memory/3024-27-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2740-61-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/3024-62-0x0000000000400000-0x0000000000411000-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
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\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 opened for modification	C:\Windows\SysWOW64\rmass.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	c64f57f9b44d5aa023d7467c15d9218e.exe
File created	C:\Windows\SysWOW64\rmass.exe	c64f57f9b44d5aa023d7467c15d9218e.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

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
2740	rmass.exe
2740	rmass.exe
2740	rmass.exe
3024	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2368	c64f57f9b44d5aa023d7467c15d9218e.exe
Token: SeDebugPrivilege	2740	rmass.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2368 wrote to memory of 2740	2368	c64f57f9b44d5aa023d7467c15d9218e.exe	28
PID 2368 wrote to memory of 2740	2368	c64f57f9b44d5aa023d7467c15d9218e.exe	28
PID 2368 wrote to memory of 2740	2368	c64f57f9b44d5aa023d7467c15d9218e.exe	28
PID 2368 wrote to memory of 2740	2368	c64f57f9b44d5aa023d7467c15d9218e.exe	28
PID 2740 wrote to memory of 436	2740	rmass.exe	5
PID 2740 wrote to memory of 1376	2740	rmass.exe	21
PID 2740 wrote to memory of 3024	2740	rmass.exe	29
PID 2740 wrote to memory of 3024	2740	rmass.exe	29
PID 2740 wrote to memory of 3024	2740	rmass.exe	29
PID 2740 wrote to memory of 3024	2740	rmass.exe	29

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

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1376
- C:\Users\Admin\AppData\Local\Temp\c64f57f9b44d5aa023d7467c15d9218e.exe
  "C:\Users\Admin\AppData\Local\Temp\c64f57f9b44d5aa023d7467c15d9218e.exe"
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2368
- - 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:2740
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:3024

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
24KB

MD5
2ac11693baec477ffcaba6a6850ab289

SHA1
ad7bac386d4f8d514ddfa8543379f9d669daa0f0

SHA256
65e37ed9e515f4bf27d5636d353a65f708326c7d346085e1860c978642a26bfd

SHA512
6eb116ced41962f584ae3ceae0a7bd1b2b95bf05f948f3cb4d193595f5e97129fdfb6c1bebc9071f96c9be68d0ef21a0248aaeac10c6cf2a0369b36c2d07e014

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

Filesize
25KB

MD5
5da2b8f1294e82fe03d8a95bc53d5275

SHA1
3b663dcbe19c5422cc2636db7a115dfc5204a635

SHA256
6de1a4f765bac7493b4c54167b1c1ff70e0ff04f4d01626352a218bf2cef69e6

SHA512
204d2ffdbb83cb539d80f2a9437763b1cf230e070e69537c35ac7df4888cd0963572ff4f95303acae7add9529b1507006c4b240d60b76bc8114be60a65676e93

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
22KB

MD5
c64f57f9b44d5aa023d7467c15d9218e

SHA1
d7e5749bc0f9df75c7e5f1ffad1eea6908a81b00

SHA256
9e932649b42f6518a53d98e503bb409e3a13bf3ba417869c901913094e20f767

SHA512
36cbf8873faf73eede168c9a4146479ca7710f03b4b7a00a1cd57cc8fb04b229ce16cc2bb930939c47556c0f109c0f5890a090a31588f5d6bf52ec6efd770506

Download Submit
memory/2368-12-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2368-5-0x0000000000320000-0x0000000000331000-memory.dmp

Filesize
68KB

Download
memory/2368-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2740-26-0x0000000000420000-0x0000000000431000-memory.dmp

Filesize
68KB

Download
memory/2740-61-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2740-101-0x0000000000420000-0x0000000000431000-memory.dmp

Filesize
68KB

Download
memory/2740-15-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/3024-27-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/3024-62-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads