6a96053a428452d0e03f2462b16265816c5b37042a81205812d6ea412f916ed6

General

Target

6a96053a428452d0e03f2462b16265816c5b37042a81205812d6ea412f916ed6.exe
Size

21KB
MD5

a09d4a606443ecbee935532ae68954f0
SHA1

8a551e63708d2e0855d07b1b7c3e1c543ba0141a
SHA256

6a96053a428452d0e03f2462b16265816c5b37042a81205812d6ea412f916ed6
SHA512

3990709f2ff65d10ffdf60ad4a1f09fda9154d49f849988a6adc608af81762d22d32498c7dcca3811478c8e12b75200a2d27c67c2ddf0f532427c8f2b3e6455c
SSDEEP

384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvX8Mb7a67:rRkiLw3HsDSARGG/MMb7r7

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
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4E515054-544d-524d-4E51-5054544D524d}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4E515054-544d-524d-4E51-5054544D524d}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	rmass.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4E515054-544d-524d-4E51-5054544D524d}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4E515054-544d-524d-4E51-5054544D524d}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	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
2420	rmass.exe
2904	rmass.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1020-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/1020-8-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/2904-18-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/files/0x0007000000023298-11.dat	upx
behavioral2/memory/2420-52-0x0000000000400000-0x0000000000411000-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\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

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 created	C:\Windows\SysWOW64\rmass.exe	6a96053a428452d0e03f2462b16265816c5b37042a81205812d6ea412f916ed6.exe
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\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\rmass.exe	6a96053a428452d0e03f2462b16265816c5b37042a81205812d6ea412f916ed6.exe
File opened for modification	C:\Windows\SysWOW64\idbg32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\aset32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.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\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
2420	rmass.exe
2420	rmass.exe
2420	rmass.exe
2420	rmass.exe
2420	rmass.exe
2420	rmass.exe
2904	rmass.exe
2904	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1020	6a96053a428452d0e03f2462b16265816c5b37042a81205812d6ea412f916ed6.exe
Token: SeDebugPrivilege	2420	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1020 wrote to memory of 2420	1020	6a96053a428452d0e03f2462b16265816c5b37042a81205812d6ea412f916ed6.exe	83
PID 1020 wrote to memory of 2420	1020	6a96053a428452d0e03f2462b16265816c5b37042a81205812d6ea412f916ed6.exe	83
PID 1020 wrote to memory of 2420	1020	6a96053a428452d0e03f2462b16265816c5b37042a81205812d6ea412f916ed6.exe	83
PID 2420 wrote to memory of 2904	2420	rmass.exe	84
PID 2420 wrote to memory of 2904	2420	rmass.exe	84
PID 2420 wrote to memory of 2904	2420	rmass.exe	84
PID 2420 wrote to memory of 612	2420	rmass.exe	5
PID 2420 wrote to memory of 3524	2420	rmass.exe	56

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:612

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3524
- C:\Users\Admin\AppData\Local\Temp\6a96053a428452d0e03f2462b16265816c5b37042a81205812d6ea412f916ed6.exe
  "C:\Users\Admin\AppData\Local\Temp\6a96053a428452d0e03f2462b16265816c5b37042a81205812d6ea412f916ed6.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1020
- - 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:2420
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:2904

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
23KB

MD5
5833665c070def10bdc4bed46e669b16

SHA1
3078e263107f50491e3419a040f491324148aba5

SHA256
87131a28a61d69211061c5e94f28f5d01619e893995732bd6b1ac8544cdfea08

SHA512
18cc1e3690b348c2baf739f02a401792fc7fc9694d7a5f272e2c1ae6f0a05701a58b318eb33aa5276c239a8624e90882fc86bfd54b04cc8b2495183dcf71387e

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

Filesize
24KB

MD5
ca642ed6a057bc96fec5c2029cce2733

SHA1
83ce924a92c32413b223dedea126d735a9a93b03

SHA256
082342a86afa84f682f717ad88bb58a019e31c7c31082a889c913f3e657cd5a0

SHA512
8780dee5a91bc28fc08353bd7e48a2d9a0a4971be51697c50b861c4ac94b6948746964d4a87f00577ba5d2cd244ac136dce0ccd1239295457126e869833f180b

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

Filesize
21KB

MD5
a09d4a606443ecbee935532ae68954f0

SHA1
8a551e63708d2e0855d07b1b7c3e1c543ba0141a

SHA256
6a96053a428452d0e03f2462b16265816c5b37042a81205812d6ea412f916ed6

SHA512
3990709f2ff65d10ffdf60ad4a1f09fda9154d49f849988a6adc608af81762d22d32498c7dcca3811478c8e12b75200a2d27c67c2ddf0f532427c8f2b3e6455c

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

Filesize
1KB

MD5
6f47b62de25d1745e296a06b3f98ed19

SHA1
a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f

SHA256
15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4

SHA512
dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7

Download Submit
memory/1020-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1020-8-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2420-52-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2904-18-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads