ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4

General

Target

ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4.exe
Size

22KB
MD5

a421d4db22bf09c8a91c1d1faed3ab25
SHA1

72413e8f3a43820fb7b019ff1dc6c92ad34be1ae
SHA256

ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4
SHA512

752556e02f30593b9d6bc85d9d5511dd74bad0befb64a15b414373d9be3a149b7f79be6f0ad2a492278cd8bc75c93d23360573ec607f17323e8d5b9edec3e3c6
SSDEEP

384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvXVB7M:rRkiLw3HsDSARGG/rM

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

Processes:

rmass.exe

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

Processes:

rmass.exe

description ioc process

File opened for modification C:\Windows\system32\drivers\etc\hosts rmass.exe

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

Processes:

rmass.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{53434647-4252-4254-5343-464742524254}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{53434647-4252-4254-5343-464742524254}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{53434647-4252-4254-5343-464742524254}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{53434647-4252-4254-5343-464742524254}\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

Processes:

rmass.exe

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

Processes:

rmass.exermass.exe

pid process

2044 rmass.exe
2860 rmass.exe

pid	process
2044	rmass.exe
2860	rmass.exe

Loads dropped DLL 3 IoCs

Processes:

ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4.exermass.exe

pid	process
1848	ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4.exe
1848	ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4.exe
2044	rmass.exe

UPX packed file 5 IoCs

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

upx

Processes:

resource	yara_rule
\Windows\SysWOW64\rmass.exe	upx
behavioral1/memory/1848-3-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2860-26-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2044-24-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2044-60-0x0000000000400000-0x0000000000411000-memory.dmp	upx

Windows security modification 2 TTPs 4 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Processes:

rmass.exe

description	ioc	process
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
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\FirewallDisableNotify = "5120"	rmass.exe

Modifies WinLogon 2 TTPs 5 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

Processes:

rmass.exe

description	ioc	process
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
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

Drops file in System32 directory 12 IoCs

Processes:

rmass.exeee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4.exe

description	ioc	process
File opened for modification	C:\Windows\SysWOW64\rmass.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4.exe
File created	C:\Windows\SysWOW64\rmass.exe	ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4.exe
File opened for modification	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\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 created	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

Drops file in Program Files directory 3 IoCs

Processes:

rmass.exe

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

Processes:

rmass.exermass.exe

pid process

2044 rmass.exe
2044 rmass.exe
2044 rmass.exe
2860 rmass.exe

pid	process
2044	rmass.exe
2044	rmass.exe
2044	rmass.exe
2860	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4.exermass.exe

description	pid	process
Token: SeDebugPrivilege	1848	ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4.exe
Token: SeDebugPrivilege	2044	rmass.exe

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4.exermass.exe

description	pid	process	target process
PID 1848 wrote to memory of 2044	1848	ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4.exe	rmass.exe
PID 1848 wrote to memory of 2044	1848	ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4.exe	rmass.exe
PID 1848 wrote to memory of 2044	1848	ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4.exe	rmass.exe
PID 1848 wrote to memory of 2044	1848	ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4.exe	rmass.exe
PID 2044 wrote to memory of 432	2044	rmass.exe	winlogon.exe
PID 2044 wrote to memory of 1368	2044	rmass.exe	Explorer.EXE
PID 2044 wrote to memory of 2860	2044	rmass.exe	rmass.exe
PID 2044 wrote to memory of 2860	2044	rmass.exe	rmass.exe
PID 2044 wrote to memory of 2860	2044	rmass.exe	rmass.exe
PID 2044 wrote to memory of 2860	2044	rmass.exe	rmass.exe

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

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1368

C:\Users\Admin\AppData\Local\Temp\ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4.exe
"C:\Users\Admin\AppData\Local\Temp\ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4.exe"
2⤵
- Loads dropped DLL
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1848

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:2044

C:\Windows\SysWOW64\rmass.exe
--k33p
4⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:2860

Network

MITRE ATT&CK Matrix ATT&CK v13

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

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

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
24KB

MD5
32b3ec6e9aa2bc7ff2c2ba9f470dad67

SHA1
2d3318d6672124c267e68e69cfe2b236482e0b8e

SHA256
b70223bfb2297471158f6435eea00527b1e7502e1592fd3453dd7340e9ac5cef

SHA512
cd3a09ff8fcbef31b4d67eb2e494ba90b74335750fbb99763e8e0ddda28e4576bdf01a780a2a83ff572a81310ba7d0d63652fa91ed196a90f385bfdddd9e39af

Download Submit
C:\Windows\SysWOW64\ntdbg.exe
Filesize
25KB

MD5
5767349ee6a95fd3bcd115c43e960979

SHA1
0510e9b52c753fb97bcde39469ff774eb124c25a

SHA256
5133ae7a02674ecadcaf7978f5a4211db8e0b67e539f0c0d0920aae7a85033ad

SHA512
fa25527fa36f991fbebd1bbfd66a281806e7ff4d3fb8261672b423c12a806ac059be2065582e44428d7f33c85ac9838a4e20a053237079602ecb01f2b339f3a8

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
a421d4db22bf09c8a91c1d1faed3ab25

SHA1
72413e8f3a43820fb7b019ff1dc6c92ad34be1ae

SHA256
ee73fc6bfd4dc4be1e2df435ef91b8936048c64b6becafa087f67b1812aa64f4

SHA512
752556e02f30593b9d6bc85d9d5511dd74bad0befb64a15b414373d9be3a149b7f79be6f0ad2a492278cd8bc75c93d23360573ec607f17323e8d5b9edec3e3c6

Download Submit
memory/1848-3-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1848-21-0x00000000002B0000-0x00000000002C1000-memory.dmp

Filesize
68KB

Download
memory/1848-83-0x00000000002B0000-0x00000000002C1000-memory.dmp

Filesize
68KB

Download
memory/2044-25-0x0000000000360000-0x0000000000371000-memory.dmp

Filesize
68KB

Download
memory/2044-24-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2044-60-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2860-26-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

Replay Monitor

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Downloads