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\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
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\AntiVirusOverride = "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
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{444A4C41-5044-4d58-444A-4C4150444d58}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{444A4C41-5044-4d58-444A-4C4150444d58}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{444A4C41-5044-4d58-444A-4C4150444d58}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{444A4C41-5044-4d58-444A-4C4150444d58}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	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
2848	rmass.exe
2696	rmass.exe

Loads dropped DLL 3 IoCs

pid	Process
2684	37cfb74369f5d8355e0e9e56c0904068.exe
2684	37cfb74369f5d8355e0e9e56c0904068.exe
2848	rmass.exe

UPX packed file 7 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2684-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x000b000000014ac6-4.dat	upx
behavioral1/memory/2684-5-0x0000000000320000-0x0000000000331000-memory.dmp	upx
behavioral1/memory/2684-12-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2848-25-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2848-26-0x0000000000360000-0x0000000000371000-memory.dmp	upx
behavioral1/memory/2696-27-0x0000000000400000-0x0000000000411000-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\idbg32.exe	rmass.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\RECOVER32.DLL	rmass.exe
File opened for modification	C:\Windows\SysWOW64\winrnt.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\aset32.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\ahuy.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\RECOVER32.DLL	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.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 4 IoCs

pid	Process
2848	rmass.exe
2848	rmass.exe
2848	rmass.exe
2696	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2684	37cfb74369f5d8355e0e9e56c0904068.exe
Token: SeDebugPrivilege	2848	rmass.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2684 wrote to memory of 2848	2684	37cfb74369f5d8355e0e9e56c0904068.exe	27
PID 2684 wrote to memory of 2848	2684	37cfb74369f5d8355e0e9e56c0904068.exe	27
PID 2684 wrote to memory of 2848	2684	37cfb74369f5d8355e0e9e56c0904068.exe	27
PID 2684 wrote to memory of 2848	2684	37cfb74369f5d8355e0e9e56c0904068.exe	27
PID 2848 wrote to memory of 424	2848	rmass.exe	22
PID 2848 wrote to memory of 1224	2848	rmass.exe	8
PID 2848 wrote to memory of 2696	2848	rmass.exe	28
PID 2848 wrote to memory of 2696	2848	rmass.exe	28
PID 2848 wrote to memory of 2696	2848	rmass.exe	28
PID 2848 wrote to memory of 2696	2848	rmass.exe	28

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1224
- C:\Users\Admin\AppData\Local\Temp\37cfb74369f5d8355e0e9e56c0904068.exe
  "C:\Users\Admin\AppData\Local\Temp\37cfb74369f5d8355e0e9e56c0904068.exe"
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2684
- - 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:2848
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:2696

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:424

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
21KB

MD5
8be6d71b39f4ce193de752e886b568aa

SHA1
5aa01626c470d011541f490794311d32f0feafe6

SHA256
8e0f5b3f06a1822fc4dd6b386bba927179f944e4588464405de83af62f96033e

SHA512
6f0a2b7315866f362ad8ada7e3912235ed48f5bc29d0065f650e86b3356a958115003eea65e0691f5377f220f890bc78b8e3b9ba30e83efb10d20b9c4efda7dd

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

Filesize
22KB

MD5
df93b111c519f853a0e03181ec9eda97

SHA1
c4603333091e99483ae8c1b0ad9879e2ef7029aa

SHA256
e554db283ecc647144263573ac57c5f294e696792184bea066d6e437b0043dd8

SHA512
4d3182ef3ca1251e4dcc5356c7566b4beb4f207bc71e8c01b7ee5f104c4ba662eee2337164e7c849f254a36310e301c30083d3e85787c1d4084786eb96fbbd1b

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
19KB

MD5
37cfb74369f5d8355e0e9e56c0904068

SHA1
8a0a7f8de13f06411b1cdc7acce02b685439ff13

SHA256
01d4c3dcaf45b7457fc051a8333136a0a28cafe93f1fd06a3e0e65666c1d9b5b

SHA512
3d0d53005d73abb304d0417486c4b6aa79ec19754b5d48dc1c566e3cf46ad1a8f4db431768be70d270bd15ac68121771cbe877924e6c5bac288140fe4cf97b84

Download Submit
memory/2684-12-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2684-20-0x0000000000320000-0x0000000000331000-memory.dmp

Filesize
68KB

Download
memory/2684-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2684-5-0x0000000000320000-0x0000000000331000-memory.dmp

Filesize
68KB

Download
memory/2696-27-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2848-26-0x0000000000360000-0x0000000000371000-memory.dmp

Filesize
68KB

Download
memory/2848-25-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2848-101-0x0000000000360000-0x0000000000371000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads