6407ab1c5c95fb2bfa04fa42bef3b1317b4b362f0b598cbfeb88fadf4c71fe1f

General

Target

6407ab1c5c95fb2bfa04fa42bef3b1317b4b362f0b598cbfeb88fadf4c71fe1f.exe
Size

22KB
MD5

8c51a530cec24e655ae2a9f14305bbac
SHA1

015863d3564622bd3324596c2a9e11c06e863141
SHA256

6407ab1c5c95fb2bfa04fa42bef3b1317b4b362f0b598cbfeb88fadf4c71fe1f
SHA512

f5b72e7af8d77bdc325717757ca343488566bcc57a7d5523d29e8cbe92be0df161c7e005390fffc89d78a4aa510c4c447c72a4cea57aebc18a6569da28c43535
SSDEEP

384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvX8Mb7a6TrPI:rRkiLw3HsDSARGG/MMb7rfPI

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 (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4256524B-4950-5453-4256-524B49505453}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4256524B-4950-5453-4256-524B49505453}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4256524B-4950-5453-4256-524B49505453}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	rmass.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4256524B-4950-5453-4256-524B49505453}	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
448	rmass.exe
5024	rmass.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4288-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/4288-7-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/files/0x000d00000002342e-6.dat	upx
behavioral2/memory/448-51-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/5024-52-0x0000000000400000-0x0000000000411000-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\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
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
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

Drops file in System32 directory 12 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\idbg32.exe	rmass.exe
File created	C:\Windows\SysWOW64\rmass.exe	6407ab1c5c95fb2bfa04fa42bef3b1317b4b362f0b598cbfeb88fadf4c71fe1f.exe
File opened for modification	C:\Windows\SysWOW64\ntdbg.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 created	C:\Windows\SysWOW64\RECOVER32.DLL	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 opened for modification	C:\Windows\SysWOW64\rmass.exe	6407ab1c5c95fb2bfa04fa42bef3b1317b4b362f0b598cbfeb88fadf4c71fe1f.exe
File opened for modification	C:\Windows\SysWOW64\ahuy.exe	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
448	rmass.exe
448	rmass.exe
448	rmass.exe
448	rmass.exe
448	rmass.exe
448	rmass.exe
5024	rmass.exe
5024	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4288	6407ab1c5c95fb2bfa04fa42bef3b1317b4b362f0b598cbfeb88fadf4c71fe1f.exe
Token: SeDebugPrivilege	448	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4288 wrote to memory of 448	4288	6407ab1c5c95fb2bfa04fa42bef3b1317b4b362f0b598cbfeb88fadf4c71fe1f.exe	83
PID 4288 wrote to memory of 448	4288	6407ab1c5c95fb2bfa04fa42bef3b1317b4b362f0b598cbfeb88fadf4c71fe1f.exe	83
PID 4288 wrote to memory of 448	4288	6407ab1c5c95fb2bfa04fa42bef3b1317b4b362f0b598cbfeb88fadf4c71fe1f.exe	83
PID 448 wrote to memory of 608	448	rmass.exe	5
PID 448 wrote to memory of 3544	448	rmass.exe	56
PID 448 wrote to memory of 5024	448	rmass.exe	84
PID 448 wrote to memory of 5024	448	rmass.exe	84
PID 448 wrote to memory of 5024	448	rmass.exe	84

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

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3544
- C:\Users\Admin\AppData\Local\Temp\6407ab1c5c95fb2bfa04fa42bef3b1317b4b362f0b598cbfeb88fadf4c71fe1f.exe
  "C:\Users\Admin\AppData\Local\Temp\6407ab1c5c95fb2bfa04fa42bef3b1317b4b362f0b598cbfeb88fadf4c71fe1f.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4288
- - 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:448
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:5024

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
d1a116ea7781f99f4a132951cf0525bb

SHA1
5161b5fa4ec916891b4e2575c44c96e908a41cb4

SHA256
de6e1881f8052f642dac2469888d5bfef9cbe0b0bf560503bc78b3e6143bbd2b

SHA512
9481b815f060d7cb20d636c7bffa69e9d4358940d86a438d48990ddd30b10a6d90c46fba66b8d668d95061369b8c111e077e35335d9b9c939aecb2dee2d6b3ef

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

Filesize
25KB

MD5
c5ee9af2ff1ffa3e8c41f98c72dfcfe5

SHA1
53def1bde1c2229be0012149950fcca918162e58

SHA256
e9d8b02c945525767a4995d3727f4e49584c229e4e778e4370e5f7a9c371f674

SHA512
f5b416c1d468d576eee4f71e56dae80a9d3b20bb0e37b78c74c702e7c441c26cc0fe69c4e9c0536e2f87d2ebf5afde011a6d5e563e0fd0742968bff940a20afa

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

Filesize
22KB

MD5
8c51a530cec24e655ae2a9f14305bbac

SHA1
015863d3564622bd3324596c2a9e11c06e863141

SHA256
6407ab1c5c95fb2bfa04fa42bef3b1317b4b362f0b598cbfeb88fadf4c71fe1f

SHA512
f5b72e7af8d77bdc325717757ca343488566bcc57a7d5523d29e8cbe92be0df161c7e005390fffc89d78a4aa510c4c447c72a4cea57aebc18a6569da28c43535

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

Filesize
1KB

MD5
6f47b62de25d1745e296a06b3f98ed19

SHA1
a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f

SHA256
15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4

SHA512
dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7

Download Submit
memory/448-51-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4288-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4288-7-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/5024-52-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads