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\{50554D41-5254-4e52-5055-4D4152544e52}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	rmass.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{50554D41-5254-4e52-5055-4D4152544e52}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{50554D41-5254-4e52-5055-4D4152544e52}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{50554D41-5254-4e52-5055-4D4152544e52}\IsInstalled = "1"	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
620	rmass.exe
2096	rmass.exe

Loads dropped DLL 3 IoCs

pid	Process
1484	6407ab1c5c95fb2bfa04fa42bef3b1317b4b362f0b598cbfeb88fadf4c71fe1f.exe
1484	6407ab1c5c95fb2bfa04fa42bef3b1317b4b362f0b598cbfeb88fadf4c71fe1f.exe
620	rmass.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral1/memory/1484-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x000a000000012280-4.dat	upx
behavioral1/memory/1484-11-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2096-58-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/620-57-0x0000000000400000-0x0000000000411000-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\aset32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	rmass.exe
File created	C:\Windows\SysWOW64\rmass.exe	6407ab1c5c95fb2bfa04fa42bef3b1317b4b362f0b598cbfeb88fadf4c71fe1f.exe
File created	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\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\idbg32.exe	rmass.exe
File opened for modification	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

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 4 IoCs

pid	Process
620	rmass.exe
620	rmass.exe
620	rmass.exe
2096	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1484	6407ab1c5c95fb2bfa04fa42bef3b1317b4b362f0b598cbfeb88fadf4c71fe1f.exe
Token: SeDebugPrivilege	620	rmass.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1484 wrote to memory of 620	1484	6407ab1c5c95fb2bfa04fa42bef3b1317b4b362f0b598cbfeb88fadf4c71fe1f.exe	28
PID 1484 wrote to memory of 620	1484	6407ab1c5c95fb2bfa04fa42bef3b1317b4b362f0b598cbfeb88fadf4c71fe1f.exe	28
PID 1484 wrote to memory of 620	1484	6407ab1c5c95fb2bfa04fa42bef3b1317b4b362f0b598cbfeb88fadf4c71fe1f.exe	28
PID 1484 wrote to memory of 620	1484	6407ab1c5c95fb2bfa04fa42bef3b1317b4b362f0b598cbfeb88fadf4c71fe1f.exe	28
PID 620 wrote to memory of 432	620	rmass.exe	5
PID 620 wrote to memory of 1192	620	rmass.exe	21
PID 620 wrote to memory of 2096	620	rmass.exe	29
PID 620 wrote to memory of 2096	620	rmass.exe	29
PID 620 wrote to memory of 2096	620	rmass.exe	29
PID 620 wrote to memory of 2096	620	rmass.exe	29

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:432

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1192
- C:\Users\Admin\AppData\Local\Temp\6407ab1c5c95fb2bfa04fa42bef3b1317b4b362f0b598cbfeb88fadf4c71fe1f.exe
  "C:\Users\Admin\AppData\Local\Temp\6407ab1c5c95fb2bfa04fa42bef3b1317b4b362f0b598cbfeb88fadf4c71fe1f.exe"
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1484
- - 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:620
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:2096

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
f7ccd631b2457ce24484eda21dbea4f4

SHA1
5a7aa87e8a415ae8103ac1aae48eb622c075336f

SHA256
6f1178a34ed80a09ea3f8cd1743f8fee2641df2a9721e7746b00671d231064ee

SHA512
2d74dfab2e07a942f6a0ddf0b48fc3da22da5e7c683e8ff2a1ec7c58caa52423714e0a5390a72a94fc62d5fb3565674029f40c9e58def590b8d252dcb7bae321

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

Filesize
25KB

MD5
e66e415b2d9da652c3a1951cae61e700

SHA1
d11e4d7e4f29c68fafbdd4025f2e6c098e8d0148

SHA256
5fde456c88a8c94f26dba6f929ff7b1ad976ef0b392211d55e7d0ec6901071ec

SHA512
2294a0c6051fe6d20f29ecc54b59f0e44a034bf56fc2c31284b43be4ef30b80fbe3e23ef8ad40dce0cf8f11e5dae554c8af008bc092f2abf1936e20cad8536bf

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
8c51a530cec24e655ae2a9f14305bbac

SHA1
015863d3564622bd3324596c2a9e11c06e863141

SHA256
6407ab1c5c95fb2bfa04fa42bef3b1317b4b362f0b598cbfeb88fadf4c71fe1f

SHA512
f5b72e7af8d77bdc325717757ca343488566bcc57a7d5523d29e8cbe92be0df161c7e005390fffc89d78a4aa510c4c447c72a4cea57aebc18a6569da28c43535

Download Submit
memory/620-57-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1484-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1484-11-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2096-58-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads