01d4c3dcaf45b7457fc051a8333136a0a28cafe93f1fd06a3e0e65666c1d9b5b

General

Target

37cfb74369f5d8355e0e9e56c0904068.exe
Size

19KB
MD5

37cfb74369f5d8355e0e9e56c0904068
SHA1

8a0a7f8de13f06411b1cdc7acce02b685439ff13
SHA256

01d4c3dcaf45b7457fc051a8333136a0a28cafe93f1fd06a3e0e65666c1d9b5b
SHA512

3d0d53005d73abb304d0417486c4b6aa79ec19754b5d48dc1c566e3cf46ad1a8f4db431768be70d270bd15ac68121771cbe877924e6c5bac288140fe4cf97b84
SSDEEP

384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvXz0SY:rRkiLw3HsDSARGG/j/Y

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\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

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\{41564349-4b59-4d47-4156-43494B594d47}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{41564349-4b59-4d47-4156-43494B594d47}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	rmass.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{41564349-4b59-4d47-4156-43494B594d47}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{41564349-4b59-4d47-4156-43494B594d47}\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
1680	rmass.exe
1132	rmass.exe

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4996-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/4996-6-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/files/0x000600000001e5df-17.dat	upx
behavioral2/memory/1680-8-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/1680-81-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/1132-88-0x0000000000400000-0x0000000000411000-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 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	37cfb74369f5d8355e0e9e56c0904068.exe
File created	C:\Windows\SysWOW64\rmass.exe	37cfb74369f5d8355e0e9e56c0904068.exe
File created	C:\Windows\SysWOW64\ntdbg.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 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

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
1680	rmass.exe
1680	rmass.exe
1680	rmass.exe
1680	rmass.exe
1680	rmass.exe
1680	rmass.exe
1132	rmass.exe
1132	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4996	37cfb74369f5d8355e0e9e56c0904068.exe
Token: SeDebugPrivilege	1680	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4996 wrote to memory of 1680	4996	37cfb74369f5d8355e0e9e56c0904068.exe	16
PID 4996 wrote to memory of 1680	4996	37cfb74369f5d8355e0e9e56c0904068.exe	16
PID 4996 wrote to memory of 1680	4996	37cfb74369f5d8355e0e9e56c0904068.exe	16
PID 1680 wrote to memory of 620	1680	rmass.exe	5
PID 1680 wrote to memory of 3488	1680	rmass.exe	48
PID 1680 wrote to memory of 1132	1680	rmass.exe	15
PID 1680 wrote to memory of 1132	1680	rmass.exe	15
PID 1680 wrote to memory of 1132	1680	rmass.exe	15

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:620

C:\Users\Admin\AppData\Local\Temp\37cfb74369f5d8355e0e9e56c0904068.exe
"C:\Users\Admin\AppData\Local\Temp\37cfb74369f5d8355e0e9e56c0904068.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4996
- C:\Windows\SysWOW64\rmass.exe
  "C:\Windows\system32\rmass.exe"
  2⤵
  - 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:1680

C:\Windows\SysWOW64\rmass.exe
--k33p
1⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:1132

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3488

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\rmass.exe

Filesize
19KB

MD5
37cfb74369f5d8355e0e9e56c0904068

SHA1
8a0a7f8de13f06411b1cdc7acce02b685439ff13

SHA256
01d4c3dcaf45b7457fc051a8333136a0a28cafe93f1fd06a3e0e65666c1d9b5b

SHA512
3d0d53005d73abb304d0417486c4b6aa79ec19754b5d48dc1c566e3cf46ad1a8f4db431768be70d270bd15ac68121771cbe877924e6c5bac288140fe4cf97b84

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

Filesize
1KB

MD5
6f47b62de25d1745e296a06b3f98ed19

SHA1
a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f

SHA256
15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4

SHA512
dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7

Download Submit
memory/1132-88-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1680-8-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1680-81-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4996-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4996-6-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads