f19fdc27aee42be3376fb2e02ebc94dbca9bc1793538e228d2fb0840936ea7d3

General

Target

f19fdc27aee42be3376fb2e02ebc94dbca9bc1793538e228d2fb0840936ea7d3.exe
Size

20KB
MD5

3bfc73146a524804aba2694c9bb286cf
SHA1

c9b8956d41c64353aed907504f2639ab6a444125
SHA256

f19fdc27aee42be3376fb2e02ebc94dbca9bc1793538e228d2fb0840936ea7d3
SHA512

ac430935df3f342681b7f1599197d178d28a4eab01c01f363dd93dfb7779e3adddea808fd063564e56c5e57a39c09ace0dab39eb21772cba607aa1c866bed515
SSDEEP

384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvXzNHdP:rRkiLw3HsDSARGG/jddP

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
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4C514844-4150-5a4b-4C51-484441505a4b}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4C514844-4150-5a4b-4C51-484441505a4b}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4C514844-4150-5a4b-4C51-484441505a4b}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4C514844-4150-5a4b-4C51-484441505a4b}\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
2964	rmass.exe
1808	rmass.exe

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4856-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/files/0x000400000001e980-6.dat	upx
behavioral2/memory/2964-12-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/4856-7-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/1808-18-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/2964-79-0x0000000000400000-0x0000000000411000-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\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

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}\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

description	ioc	Process
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\ahuy.exe	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	f19fdc27aee42be3376fb2e02ebc94dbca9bc1793538e228d2fb0840936ea7d3.exe
File created	C:\Windows\SysWOW64\rmass.exe	f19fdc27aee42be3376fb2e02ebc94dbca9bc1793538e228d2fb0840936ea7d3.exe
File opened for modification	C:\Windows\SysWOW64\ntdbg.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\RECOVER32.DLL	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\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 8 IoCs

pid	Process
2964	rmass.exe
2964	rmass.exe
2964	rmass.exe
2964	rmass.exe
2964	rmass.exe
2964	rmass.exe
1808	rmass.exe
1808	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4856	f19fdc27aee42be3376fb2e02ebc94dbca9bc1793538e228d2fb0840936ea7d3.exe
Token: SeDebugPrivilege	2964	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4856 wrote to memory of 2964	4856	f19fdc27aee42be3376fb2e02ebc94dbca9bc1793538e228d2fb0840936ea7d3.exe	89
PID 4856 wrote to memory of 2964	4856	f19fdc27aee42be3376fb2e02ebc94dbca9bc1793538e228d2fb0840936ea7d3.exe	89
PID 4856 wrote to memory of 2964	4856	f19fdc27aee42be3376fb2e02ebc94dbca9bc1793538e228d2fb0840936ea7d3.exe	89
PID 2964 wrote to memory of 612	2964	rmass.exe	5
PID 2964 wrote to memory of 3444	2964	rmass.exe	56
PID 2964 wrote to memory of 1808	2964	rmass.exe	90
PID 2964 wrote to memory of 1808	2964	rmass.exe	90
PID 2964 wrote to memory of 1808	2964	rmass.exe	90

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:612

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3444
- C:\Users\Admin\AppData\Local\Temp\f19fdc27aee42be3376fb2e02ebc94dbca9bc1793538e228d2fb0840936ea7d3.exe
  "C:\Users\Admin\AppData\Local\Temp\f19fdc27aee42be3376fb2e02ebc94dbca9bc1793538e228d2fb0840936ea7d3.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4856
- - 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:2964
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:1808

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
22KB

MD5
57a09b251ee64e3196f6a7556cae8e48

SHA1
00991cf49c6969980ba4d5d1bd357ce4c2fbd992

SHA256
1fcff5772b73314cbdf28688769cc4c82eddea3a69beb6e830069da9307b58ec

SHA512
6d2bd05a723182e8b36c808247f75ff9592dd4c23337c770ea07022a0ee4db3e5b64fe7548cf454f0d72c7c6f334339fc14de47143f687f848d2a899c5991ca7

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

Filesize
23KB

MD5
33be50ce63557eae0fd35f4fbe827a35

SHA1
fe1a5b77fc7ca639f144cb6973a0180a454622bc

SHA256
e3c0f3d15b0358e656306ab19fbac4300b38bacfbd1cf24e02ac5eb04494a31f

SHA512
deafff84c1f34db2c7fc61ea8a5f828674311c75ffe618f09b04c0bbd6653b7b8f77671cc562417c6abb02a2ac1fe7b9bc7020c62475052f7b06c03c584d5299

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

Filesize
20KB

MD5
3bfc73146a524804aba2694c9bb286cf

SHA1
c9b8956d41c64353aed907504f2639ab6a444125

SHA256
f19fdc27aee42be3376fb2e02ebc94dbca9bc1793538e228d2fb0840936ea7d3

SHA512
ac430935df3f342681b7f1599197d178d28a4eab01c01f363dd93dfb7779e3adddea808fd063564e56c5e57a39c09ace0dab39eb21772cba607aa1c866bed515

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

Filesize
1KB

MD5
6f47b62de25d1745e296a06b3f98ed19

SHA1
a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f

SHA256
15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4

SHA512
dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7

Download Submit
memory/1808-18-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2964-12-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2964-79-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4856-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4856-7-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads