450f0d45400d78f4754a1221f1601b83bc64ad04e26374d84f2aa7cd259dfcb4

General

Target

f95d58c0de3e890264669c4acf4bd8f5_JC.exe
Size

18KB
MD5

f95d58c0de3e890264669c4acf4bd8f5
SHA1

6fc609d2af3c7e3b42e47b7305145c4580567311
SHA256

450f0d45400d78f4754a1221f1601b83bc64ad04e26374d84f2aa7cd259dfcb4
SHA512

29092ed09bc3136171abe5004691be5d28bf2748eadeafb0d067ad501ca9db3a8006466a86300f25512cabd456e9eb61d217743a6a01f0d01cc3ae0743cc09b9
SSDEEP

384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvXf43:rRkiLw3HsDSARGG/w3

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\{4F585751-444b-5356-4F58-5751444B5356}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	rmass.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4F585751-444b-5356-4F58-5751444B5356}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4F585751-444b-5356-4F58-5751444B5356}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4F585751-444b-5356-4F58-5751444B5356}\IsInstalled = "1"	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
1228	rmass.exe
1600	rmass.exe

UPX packed file 8 IoCs

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

upx

resource	yara_rule
behavioral2/memory/5004-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/5004-4-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/5004-5-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/files/0x00040000000227c1-8.dat	upx
behavioral2/files/0x00040000000227c1-9.dat	upx
behavioral2/files/0x00040000000227c1-11.dat	upx
behavioral2/memory/1228-43-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/1600-47-0x0000000000400000-0x0000000000411000-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
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\ahuy.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\aset32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	f95d58c0de3e890264669c4acf4bd8f5_JC.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\rmass.exe	rmass.exe
File created	C:\Windows\SysWOW64\rmass.exe	f95d58c0de3e890264669c4acf4bd8f5_JC.exe
File created	C:\Windows\SysWOW64\ahuy.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\idbg32.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
1600	rmass.exe
1600	rmass.exe
1228	rmass.exe
1228	rmass.exe
1228	rmass.exe
1228	rmass.exe
1228	rmass.exe
1228	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5004	f95d58c0de3e890264669c4acf4bd8f5_JC.exe
Token: SeDebugPrivilege	1228	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 5004 wrote to memory of 1228	5004	f95d58c0de3e890264669c4acf4bd8f5_JC.exe	86
PID 5004 wrote to memory of 1228	5004	f95d58c0de3e890264669c4acf4bd8f5_JC.exe	86
PID 5004 wrote to memory of 1228	5004	f95d58c0de3e890264669c4acf4bd8f5_JC.exe	86
PID 1228 wrote to memory of 1600	1228	rmass.exe	88
PID 1228 wrote to memory of 1600	1228	rmass.exe	88
PID 1228 wrote to memory of 1600	1228	rmass.exe	88
PID 1228 wrote to memory of 624	1228	rmass.exe	79
PID 1228 wrote to memory of 3192	1228	rmass.exe	37

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3192
- C:\Users\Admin\AppData\Local\Temp\f95d58c0de3e890264669c4acf4bd8f5_JC.exe
  "C:\Users\Admin\AppData\Local\Temp\f95d58c0de3e890264669c4acf4bd8f5_JC.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:5004
- - 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:1228
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:1600

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:624

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

Loading Replay Monitor...

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
0c3f6e73b97b3e927b97036aff5cdf38

SHA1
1cdadbe70019eae382609ffa3a24039f7d4116ed

SHA256
df968fdb69ff192b11bf37a0995adf1eaf46f13cbbf767160d5a5b1806dbd5ae

SHA512
d22c5805bdc4207d99211ed5b5ac586abf0fa61ac21323a008daf0f269e32dbe15fbc7713e8f0a5d2cec4dea135343a0ceca6767ec10df939020851eaff3b30e

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

Filesize
22KB

MD5
06c240179bd64266b52e899682578157

SHA1
d85c639a19f56549a3a5f18b748418cd2e046b5d

SHA256
9575e89c25c76cff45f1f810ba988a613768c884e66aa218eb88f15dfaa44ddb

SHA512
90ef1101977502d4a4e8c0a7cc410edb8b6ea30eed2b3c34e37f53431ae6e994e8e76065efee9bb81f9a132e0687a1e758ab0b63cd6a173f7f0e689ec6c13d12

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

Filesize
18KB

MD5
f95d58c0de3e890264669c4acf4bd8f5

SHA1
6fc609d2af3c7e3b42e47b7305145c4580567311

SHA256
450f0d45400d78f4754a1221f1601b83bc64ad04e26374d84f2aa7cd259dfcb4

SHA512
29092ed09bc3136171abe5004691be5d28bf2748eadeafb0d067ad501ca9db3a8006466a86300f25512cabd456e9eb61d217743a6a01f0d01cc3ae0743cc09b9

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

Filesize
18KB

MD5
f95d58c0de3e890264669c4acf4bd8f5

SHA1
6fc609d2af3c7e3b42e47b7305145c4580567311

SHA256
450f0d45400d78f4754a1221f1601b83bc64ad04e26374d84f2aa7cd259dfcb4

SHA512
29092ed09bc3136171abe5004691be5d28bf2748eadeafb0d067ad501ca9db3a8006466a86300f25512cabd456e9eb61d217743a6a01f0d01cc3ae0743cc09b9

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

Filesize
18KB

MD5
f95d58c0de3e890264669c4acf4bd8f5

SHA1
6fc609d2af3c7e3b42e47b7305145c4580567311

SHA256
450f0d45400d78f4754a1221f1601b83bc64ad04e26374d84f2aa7cd259dfcb4

SHA512
29092ed09bc3136171abe5004691be5d28bf2748eadeafb0d067ad501ca9db3a8006466a86300f25512cabd456e9eb61d217743a6a01f0d01cc3ae0743cc09b9

Download Submit
memory/1228-43-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1600-47-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/5004-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/5004-4-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/5004-5-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads