4cf0238cdd275a66de9ee1ea32e02ce3fc4bb6d33cf9bdc1ba39c6c58789830e

General

Target

4cf0238cdd275a66de9ee1ea32e02ce3fc4bb6d33cf9bdc1ba39c6c58789830e.exe
Size

20KB
MD5

02fc12942ca3aade3adb4b3c30524d4e
SHA1

486cc3e5f7f48cd55f8e19e554802cfc571e2c1c
SHA256

4cf0238cdd275a66de9ee1ea32e02ce3fc4bb6d33cf9bdc1ba39c6c58789830e
SHA512

f720ef88792e967a57e1db265d109033aea71968d394ffa0fab5fad0029d2bd9074282c7036f34401c27d4b40748364e825652745f3ea443035bc67b46ffc753
SSDEEP

384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvX89skaG:rRkiLw3HsDSARGG/s9skx

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\{4F424A49-5955-4945-4F42-4A4959554945}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4F424A49-5955-4945-4F42-4A4959554945}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4F424A49-5955-4945-4F42-4A4959554945}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4F424A49-5955-4945-4F42-4A4959554945}\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
4336	rmass.exe
1524	rmass.exe

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1384-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/files/0x000700000002328e-6.dat	upx
behavioral2/memory/1384-12-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/1524-18-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/4336-52-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/1524-53-0x0000000000400000-0x0000000000411000-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\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
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\FirewallDisableNotify = "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\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
File opened for modification	C:\Windows\SysWOW64\aset32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	4cf0238cdd275a66de9ee1ea32e02ce3fc4bb6d33cf9bdc1ba39c6c58789830e.exe
File created	C:\Windows\SysWOW64\rmass.exe	4cf0238cdd275a66de9ee1ea32e02ce3fc4bb6d33cf9bdc1ba39c6c58789830e.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\RECOVER32.DLL	rmass.exe
File opened for modification	C:\Windows\SysWOW64\winrnt.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
4336	rmass.exe
4336	rmass.exe
4336	rmass.exe
4336	rmass.exe
4336	rmass.exe
4336	rmass.exe
1524	rmass.exe
1524	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1384	4cf0238cdd275a66de9ee1ea32e02ce3fc4bb6d33cf9bdc1ba39c6c58789830e.exe
Token: SeDebugPrivilege	4336	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1384 wrote to memory of 4336	1384	4cf0238cdd275a66de9ee1ea32e02ce3fc4bb6d33cf9bdc1ba39c6c58789830e.exe	82
PID 1384 wrote to memory of 4336	1384	4cf0238cdd275a66de9ee1ea32e02ce3fc4bb6d33cf9bdc1ba39c6c58789830e.exe	82
PID 1384 wrote to memory of 4336	1384	4cf0238cdd275a66de9ee1ea32e02ce3fc4bb6d33cf9bdc1ba39c6c58789830e.exe	82
PID 4336 wrote to memory of 608	4336	rmass.exe	5
PID 4336 wrote to memory of 1524	4336	rmass.exe	83
PID 4336 wrote to memory of 1524	4336	rmass.exe	83
PID 4336 wrote to memory of 1524	4336	rmass.exe	83
PID 4336 wrote to memory of 3412	4336	rmass.exe	56

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

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3412
- C:\Users\Admin\AppData\Local\Temp\4cf0238cdd275a66de9ee1ea32e02ce3fc4bb6d33cf9bdc1ba39c6c58789830e.exe
  "C:\Users\Admin\AppData\Local\Temp\4cf0238cdd275a66de9ee1ea32e02ce3fc4bb6d33cf9bdc1ba39c6c58789830e.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1384
- - 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:4336
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:1524

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
22KB

MD5
46441d673055bd5d7828e4ec299fc102

SHA1
868d7195696afcda758fabaf0351367224a4da21

SHA256
64531d4af0408f5aed97c888f0d35047677f93cc68a799d636023d96208c87c1

SHA512
5a26c9aa0d7b0e2db589ce644d78e52f75905cdf48aaac8743ff82c69c8e95a7626e8003da635e1d3e555598ddb9e21471d4e1516b8cbb8e1ae21fba8d87939b

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

Filesize
23KB

MD5
c1b52f8fa57a457daa1e3d27845c4439

SHA1
66eb157b0205a49d108c434491ce4c9d6f2d6e96

SHA256
fe8c785755326543442b9ac07efdac0455958016d0081f875dc5eacda819f877

SHA512
0ad15ba6c0efc81c87fc44317daf0f61b87e7cb9822a13c85e462bab03ef847ca5442823c27b70f75b97f71daf16b0d02d4b5e5da03b56864c4fd1714ca6e85f

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

Filesize
20KB

MD5
02fc12942ca3aade3adb4b3c30524d4e

SHA1
486cc3e5f7f48cd55f8e19e554802cfc571e2c1c

SHA256
4cf0238cdd275a66de9ee1ea32e02ce3fc4bb6d33cf9bdc1ba39c6c58789830e

SHA512
f720ef88792e967a57e1db265d109033aea71968d394ffa0fab5fad0029d2bd9074282c7036f34401c27d4b40748364e825652745f3ea443035bc67b46ffc753

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

Filesize
1KB

MD5
6f47b62de25d1745e296a06b3f98ed19

SHA1
a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f

SHA256
15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4

SHA512
dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7

Download Submit
memory/1384-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1384-12-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1524-18-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1524-53-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4336-52-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads