4283875f2f738f20af8fd3ee37347983afcbc6bc00e55f745cde0cdee6de436a

General

Target

4283875f2f738f20af8fd3ee37347983afcbc6bc00e55f745cde0cdee6de436a.exe
Size

23KB
MD5

1d13edabe87af0f7a96bde87cb612020
SHA1

7cfa8b270fd8626cd49c2ae63cf2805a2efb9c1d
SHA256

4283875f2f738f20af8fd3ee37347983afcbc6bc00e55f745cde0cdee6de436a
SHA512

4e839e53d140821fa75c6179ab0bfdd324700ee989b6a98a4405b4377f491c5f9451d4b3169981e44e43caf5ff830b481c37dcb16baa35f109891447d7f1e5ae
SSDEEP

384:jIz4t0Ht9JYtEmL3WQa7FkoE5lwVlRxJistz+3waWjElIDxUVDwNU8w5sDmYH:jIU6J3m5VaRxUstzcwv0DD0UnuDmYH

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\{495A4B43-4b4f-5450-495A-4B434B4F5450}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{495A4B43-4b4f-5450-495A-4B434B4F5450}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{495A4B43-4b4f-5450-495A-4B434B4F5450}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{495A4B43-4b4f-5450-495A-4B434B4F5450}\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
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe\Debugger = "C:\\Windows\\system32\\ntdbg.exe"	rmass.exe
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

Executes dropped EXE 2 IoCs

pid	Process
1856	rmass.exe
2480	rmass.exe

Loads dropped DLL 3 IoCs

pid	Process
1612	4283875f2f738f20af8fd3ee37347983afcbc6bc00e55f745cde0cdee6de436a.exe
1612	4283875f2f738f20af8fd3ee37347983afcbc6bc00e55f745cde0cdee6de436a.exe
1856	rmass.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral1/files/0x000c00000001340b-1.dat	upx
behavioral1/memory/1612-2-0x0000000000020000-0x0000000000031000-memory.dmp	upx
behavioral1/memory/1856-10-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2480-22-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/1856-56-0x0000000000400000-0x0000000000411000-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\ahuy.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\winrnt.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\aset32.exe	rmass.exe
File created	C:\Windows\SysWOW64\rmass.exe	4283875f2f738f20af8fd3ee37347983afcbc6bc00e55f745cde0cdee6de436a.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\RECOVER32.DLL	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\rmass.exe	4283875f2f738f20af8fd3ee37347983afcbc6bc00e55f745cde0cdee6de436a.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
1856	rmass.exe
1856	rmass.exe
1856	rmass.exe
2480	rmass.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1856	rmass.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1612 wrote to memory of 1856	1612	4283875f2f738f20af8fd3ee37347983afcbc6bc00e55f745cde0cdee6de436a.exe	28
PID 1612 wrote to memory of 1856	1612	4283875f2f738f20af8fd3ee37347983afcbc6bc00e55f745cde0cdee6de436a.exe	28
PID 1612 wrote to memory of 1856	1612	4283875f2f738f20af8fd3ee37347983afcbc6bc00e55f745cde0cdee6de436a.exe	28
PID 1612 wrote to memory of 1856	1612	4283875f2f738f20af8fd3ee37347983afcbc6bc00e55f745cde0cdee6de436a.exe	28
PID 1856 wrote to memory of 436	1856	rmass.exe	5
PID 1856 wrote to memory of 1192	1856	rmass.exe	21
PID 1856 wrote to memory of 2480	1856	rmass.exe	29
PID 1856 wrote to memory of 2480	1856	rmass.exe	29
PID 1856 wrote to memory of 2480	1856	rmass.exe	29
PID 1856 wrote to memory of 2480	1856	rmass.exe	29

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:436

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1192
- C:\Users\Admin\AppData\Local\Temp\4283875f2f738f20af8fd3ee37347983afcbc6bc00e55f745cde0cdee6de436a.exe
  "C:\Users\Admin\AppData\Local\Temp\4283875f2f738f20af8fd3ee37347983afcbc6bc00e55f745cde0cdee6de436a.exe"
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - Suspicious use of WriteProcessMemory
  PID:1612
- - C:\Windows\SysWOW64\rmass.exe
    "C:\Windows\SysWOW64\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:1856
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:2480

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
23KB

MD5
e6815091179451b40979bc0ad21be396

SHA1
14ae5367046a04119a8f40b5ab198265a3754eda

SHA256
bc9ea0cf4c6292bfcdc6e17e683a9a43980a4f66d440ab8349a550a76bdcdae4

SHA512
8dc1c317ea89a2a71483a474ff0e110b466be0422e40465fc6f77fb0d4b0014ac926cc084e573b7b0ef1f30f3954f5e0edb3181e11a28ddc23d0d172d61f83c6

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

Filesize
24KB

MD5
59b55c2939ae84e132b3ded1801453e7

SHA1
d9cb4264a919c74207d03428b78571a5d090d41d

SHA256
9cb513671939e006e5b93695386f3b0ddbcbd83ae8a0a584d155ba3b8af073bb

SHA512
2e8bab74a4ff14548e7614ed52ab27e902345ae65d6a22b0746ac5cdcbfc768e98ab812c63b0fdfcc86d238188709000095748944432879ac37a8045b21ae169

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
21KB

MD5
90cb929f2ad5e348b0cb5be50af42e91

SHA1
2dc448742e87780c78430981e4f907f5d41230c7

SHA256
33288e0e5999074d3225f9592bb2b39912d89aa9badd83c11a4c828d61677451

SHA512
2a03e77645d188d3a7776fcdbd8b304dd5f10a4dec9bab560dd5a1e74b0b2d7bf9373e941b9606f8a2f221c3b44733a0e0f18c63fbbcc750d1e6753621ca8417

Download Submit
memory/1612-2-0x0000000000020000-0x0000000000031000-memory.dmp

Filesize
68KB

Download
memory/1612-8-0x0000000000400000-0x0000000000403000-memory.dmp

Filesize
12KB

Download
memory/1856-10-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1856-56-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1856-96-0x0000000000360000-0x0000000000371000-memory.dmp

Filesize
68KB

Download
memory/2480-22-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads