9b8b745b7de3cd754e9d7a86217429c21d1f178c736bdffab29b0b7a989b3e35

General

Target

NEAS.21bea3cbf86d29540f5ad0e2cbe644f3.exe
Size

19KB
MD5

21bea3cbf86d29540f5ad0e2cbe644f3
SHA1

6eb18ceee7b8420dd4a0151ced950a740dbbb325
SHA256

9b8b745b7de3cd754e9d7a86217429c21d1f178c736bdffab29b0b7a989b3e35
SHA512

6bb51c9cc0d0ff621f18f7e6800935b315f1eeda84c987bb279f6377b6879b5f0e2f8775b0719549093e06cd4a98551599aecf00ac741c12fd0f8db21159ce7b
SSDEEP

384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvXaB7fp:rRkiLw3HsDSARGG/2bp

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\{51494146-4147-584b-5149-41464147584b}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{51494146-4147-584b-5149-41464147584b}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{51494146-4147-584b-5149-41464147584b}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	rmass.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{51494146-4147-584b-5149-41464147584b}	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
4328	rmass.exe
3088	rmass.exe

UPX packed file 7 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4588-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/files/0x0007000000022e3f-7.dat	upx
behavioral2/files/0x0007000000022e3f-5.dat	upx
behavioral2/memory/4588-6-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/files/0x0007000000022e3f-9.dat	upx
behavioral2/memory/4328-77-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/3088-84-0x0000000000400000-0x0000000000411000-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\{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 created	C:\Windows\SysWOW64\rmass.exe	NEAS.21bea3cbf86d29540f5ad0e2cbe644f3.exe
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\winrnt.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	NEAS.21bea3cbf86d29540f5ad0e2cbe644f3.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\aset32.exe	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 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\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
3088	rmass.exe
3088	rmass.exe
4328	rmass.exe
4328	rmass.exe
4328	rmass.exe
4328	rmass.exe
4328	rmass.exe
4328	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4588	NEAS.21bea3cbf86d29540f5ad0e2cbe644f3.exe
Token: SeDebugPrivilege	4328	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4588 wrote to memory of 4328	4588	NEAS.21bea3cbf86d29540f5ad0e2cbe644f3.exe	89
PID 4588 wrote to memory of 4328	4588	NEAS.21bea3cbf86d29540f5ad0e2cbe644f3.exe	89
PID 4588 wrote to memory of 4328	4588	NEAS.21bea3cbf86d29540f5ad0e2cbe644f3.exe	89
PID 4328 wrote to memory of 3088	4328	rmass.exe	90
PID 4328 wrote to memory of 3088	4328	rmass.exe	90
PID 4328 wrote to memory of 3088	4328	rmass.exe	90
PID 4328 wrote to memory of 628	4328	rmass.exe	80
PID 4328 wrote to memory of 3140	4328	rmass.exe	39

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3140
- C:\Users\Admin\AppData\Local\Temp\NEAS.21bea3cbf86d29540f5ad0e2cbe644f3.exe
  "C:\Users\Admin\AppData\Local\Temp\NEAS.21bea3cbf86d29540f5ad0e2cbe644f3.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4588
- - 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:4328
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:3088

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:628

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

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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
21KB

MD5
9579d99dbd4be1c04c8d5b9b40ecb28a

SHA1
bea16f39d8d133caa8f2ebe0bb343c280115fa5b

SHA256
3addd9e2f7fa952ef0fa88266017e38798c08aaba8aef2a4dc619ff587b6fd71

SHA512
7b26821776d1fad9ff51a90acdcb052c3b3bc4ab83d46343eb0cea99306b54f0f98d7bbdd8514ca3e6a8c8fb340d57f1dc6d200f73fa1e791266179e1568c129

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

Filesize
22KB

MD5
30adcfa786030d9e1419c04fa2428b4d

SHA1
03f47a14a5b81dc7dc7613850ac298844ff756e5

SHA256
6b1eaca02e00afbb4fa3363d3cf5b15fc5ab98d6bb164274b8fcac2a85eb7675

SHA512
54e76da3d7ba1bd2271eeaf3679b6bf8e67aa478b9f65e9ce16283019142b4c714e76579369e5fc4afac1be315c0a64b8ac0773f998dde4a200da1056872d827

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

Filesize
19KB

MD5
21bea3cbf86d29540f5ad0e2cbe644f3

SHA1
6eb18ceee7b8420dd4a0151ced950a740dbbb325

SHA256
9b8b745b7de3cd754e9d7a86217429c21d1f178c736bdffab29b0b7a989b3e35

SHA512
6bb51c9cc0d0ff621f18f7e6800935b315f1eeda84c987bb279f6377b6879b5f0e2f8775b0719549093e06cd4a98551599aecf00ac741c12fd0f8db21159ce7b

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

Filesize
19KB

MD5
21bea3cbf86d29540f5ad0e2cbe644f3

SHA1
6eb18ceee7b8420dd4a0151ced950a740dbbb325

SHA256
9b8b745b7de3cd754e9d7a86217429c21d1f178c736bdffab29b0b7a989b3e35

SHA512
6bb51c9cc0d0ff621f18f7e6800935b315f1eeda84c987bb279f6377b6879b5f0e2f8775b0719549093e06cd4a98551599aecf00ac741c12fd0f8db21159ce7b

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

Filesize
19KB

MD5
21bea3cbf86d29540f5ad0e2cbe644f3

SHA1
6eb18ceee7b8420dd4a0151ced950a740dbbb325

SHA256
9b8b745b7de3cd754e9d7a86217429c21d1f178c736bdffab29b0b7a989b3e35

SHA512
6bb51c9cc0d0ff621f18f7e6800935b315f1eeda84c987bb279f6377b6879b5f0e2f8775b0719549093e06cd4a98551599aecf00ac741c12fd0f8db21159ce7b

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

Filesize
1KB

MD5
6f47b62de25d1745e296a06b3f98ed19

SHA1
a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f

SHA256
15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4

SHA512
dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7

Download Submit
memory/3088-84-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4328-77-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4588-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4588-6-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads