83f65515eb848b7036034d62800e3b1bf04b8c76bd0d4cd39bb897fcdf01abbc

General

Target

83f65515eb848b7036034d62800e3b1bf04b8c76bd0d4cd39bb897fcdf01abbc.exe
Size

24KB
MD5

2772a0d2283e9d652a593c39951ca2a0
SHA1

0485d500bd3165d312a1863b7d57135950a61422
SHA256

83f65515eb848b7036034d62800e3b1bf04b8c76bd0d4cd39bb897fcdf01abbc
SHA512

5140704cef2a2cfee4ccce5a73da08da3cbcec33a70a1337a6d38a2a37c0ac7385a1610a40f86f17988e1562da12517b5e23ac8a84af7352a2905f73887ecb74
SSDEEP

768:jIUimMeTddsf9F7Rj8tXQ8vGIDflLLdlBF+pjP4x9:j0mrTdGu5Zv/f5Ggx9

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\{47534147-4d48-4351-4753-41474D484351}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47534147-4d48-4351-4753-41474D484351}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47534147-4d48-4351-4753-41474D484351}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47534147-4d48-4351-4753-41474D484351}\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
1436	rmass.exe
2460	rmass.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x0006000000023270-2.dat	upx
behavioral2/memory/1436-5-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/1436-48-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/2460-49-0x0000000000400000-0x0000000000411000-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	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
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\{BC84DF00-BC38-9902-8082-6FCBF2D87A0B}	rmass.exe

Drops file in System32 directory 12 IoCs

description	ioc	Process
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\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	83f65515eb848b7036034d62800e3b1bf04b8c76bd0d4cd39bb897fcdf01abbc.exe
File created	C:\Windows\SysWOW64\rmass.exe	83f65515eb848b7036034d62800e3b1bf04b8c76bd0d4cd39bb897fcdf01abbc.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\ntdbg.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\idbg32.exe	rmass.exe
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

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
1436	rmass.exe
1436	rmass.exe
1436	rmass.exe
1436	rmass.exe
1436	rmass.exe
1436	rmass.exe
2460	rmass.exe
2460	rmass.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1436	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4696 wrote to memory of 1436	4696	83f65515eb848b7036034d62800e3b1bf04b8c76bd0d4cd39bb897fcdf01abbc.exe	83
PID 4696 wrote to memory of 1436	4696	83f65515eb848b7036034d62800e3b1bf04b8c76bd0d4cd39bb897fcdf01abbc.exe	83
PID 4696 wrote to memory of 1436	4696	83f65515eb848b7036034d62800e3b1bf04b8c76bd0d4cd39bb897fcdf01abbc.exe	83
PID 1436 wrote to memory of 616	1436	rmass.exe	5
PID 1436 wrote to memory of 3460	1436	rmass.exe	56
PID 1436 wrote to memory of 2460	1436	rmass.exe	84
PID 1436 wrote to memory of 2460	1436	rmass.exe	84
PID 1436 wrote to memory of 2460	1436	rmass.exe	84

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

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3460
- C:\Users\Admin\AppData\Local\Temp\83f65515eb848b7036034d62800e3b1bf04b8c76bd0d4cd39bb897fcdf01abbc.exe
  "C:\Users\Admin\AppData\Local\Temp\83f65515eb848b7036034d62800e3b1bf04b8c76bd0d4cd39bb897fcdf01abbc.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of WriteProcessMemory
  PID:4696
- - C:\Windows\SysWOW64\rmass.exe
    "C:\Windows\SysWOW64\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:1436
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:2460

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
c6fed93864998c283d042bc06504854f

SHA1
b32115158d6cf5f217c451fb9ce577748923246d

SHA256
03ad11514a99223c950de746321e33ef1c12b3054e22aa1b39b9ad5e0d91b227

SHA512
981641f64fa5f928ae2d6c9dc2686a4ac7c1d8087cdeaf4c3d4707c8d047a559793661e1ee29471eefaa8586cfc6e6c011b7feba3c8abab26ae80a16bc423ea8

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

Filesize
25KB

MD5
b97d5394a7c4a42e7c8ac945fef514b4

SHA1
ba1475d74e4cba8c8b23c2b632ea58b251165051

SHA256
fa0addde28dfce8ff178ef7970e8c03dada5567de7c053c3c58fbf629c82c5d7

SHA512
8b7254599d7c730648ceb3e8bb7c09a3c36abd4c8b04b70d6dc1606e1180f06a47de120c3f323032e966eb3cf3ee5009e7fff5477d061933eab1a759b050fd15

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

Filesize
22KB

MD5
1acbc3a5dd270957ac850c17e0abb4dc

SHA1
5cb132a4dd0ae59a91a05417b1a564389c65c9fc

SHA256
4bbf16ae37bc7884256ae1a3e6bea43511fffe154dc62ce72dcd0120d20d3d1d

SHA512
ec683d93487abe980a57a21511fa5af3f13a1fec28c80d4316546915d3b0b5794fb71efecb030bcfa73d85bc33c0e4ab6cce07ec1a2f72c5ccf631652ea54a66

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

Filesize
1KB

MD5
6f47b62de25d1745e296a06b3f98ed19

SHA1
a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f

SHA256
15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4

SHA512
dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7

Download Submit
memory/1436-5-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1436-48-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2460-49-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4696-3-0x0000000000400000-0x0000000000403000-memory.dmp

Filesize
12KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads