4cf0238cdd275a66de9ee1ea32e02ce3fc4bb6d33cf9bdc1ba39c6c58789830e

General

Target

4cf0238cdd275a66de9ee1ea32e02ce3fc4bb6d33cf9bdc1ba39c6c58789830e.exe
Size

20KB
MD5

02fc12942ca3aade3adb4b3c30524d4e
SHA1

486cc3e5f7f48cd55f8e19e554802cfc571e2c1c
SHA256

4cf0238cdd275a66de9ee1ea32e02ce3fc4bb6d33cf9bdc1ba39c6c58789830e
SHA512

f720ef88792e967a57e1db265d109033aea71968d394ffa0fab5fad0029d2bd9074282c7036f34401c27d4b40748364e825652745f3ea443035bc67b46ffc753
SSDEEP

384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvX89skaG:rRkiLw3HsDSARGG/s9skx

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\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

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 (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{50554D41-5254-4e52-5055-4D4152544e52}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{50554D41-5254-4e52-5055-4D4152544e52}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	rmass.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{50554D41-5254-4e52-5055-4D4152544e52}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{50554D41-5254-4e52-5055-4D4152544e52}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	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
1948	rmass.exe
2216	rmass.exe

Loads dropped DLL 3 IoCs

pid	Process
2244	4cf0238cdd275a66de9ee1ea32e02ce3fc4bb6d33cf9bdc1ba39c6c58789830e.exe
2244	4cf0238cdd275a66de9ee1ea32e02ce3fc4bb6d33cf9bdc1ba39c6c58789830e.exe
1948	rmass.exe

UPX packed file 7 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2244-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x000a000000012286-14.dat	upx
behavioral1/memory/2216-26-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/1948-20-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2244-12-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2244-5-0x0000000000320000-0x0000000000331000-memory.dmp	upx
behavioral1/memory/1948-60-0x0000000000400000-0x0000000000411000-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}\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
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

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\aset32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\idbg32.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	4cf0238cdd275a66de9ee1ea32e02ce3fc4bb6d33cf9bdc1ba39c6c58789830e.exe
File created	C:\Windows\SysWOW64\rmass.exe	4cf0238cdd275a66de9ee1ea32e02ce3fc4bb6d33cf9bdc1ba39c6c58789830e.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 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
1948	rmass.exe
1948	rmass.exe
1948	rmass.exe
2216	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2244	4cf0238cdd275a66de9ee1ea32e02ce3fc4bb6d33cf9bdc1ba39c6c58789830e.exe
Token: SeDebugPrivilege	1948	rmass.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2244 wrote to memory of 1948	2244	4cf0238cdd275a66de9ee1ea32e02ce3fc4bb6d33cf9bdc1ba39c6c58789830e.exe	28
PID 2244 wrote to memory of 1948	2244	4cf0238cdd275a66de9ee1ea32e02ce3fc4bb6d33cf9bdc1ba39c6c58789830e.exe	28
PID 2244 wrote to memory of 1948	2244	4cf0238cdd275a66de9ee1ea32e02ce3fc4bb6d33cf9bdc1ba39c6c58789830e.exe	28
PID 2244 wrote to memory of 1948	2244	4cf0238cdd275a66de9ee1ea32e02ce3fc4bb6d33cf9bdc1ba39c6c58789830e.exe	28
PID 1948 wrote to memory of 432	1948	rmass.exe	5
PID 1948 wrote to memory of 1200	1948	rmass.exe	21
PID 1948 wrote to memory of 2216	1948	rmass.exe	29
PID 1948 wrote to memory of 2216	1948	rmass.exe	29
PID 1948 wrote to memory of 2216	1948	rmass.exe	29
PID 1948 wrote to memory of 2216	1948	rmass.exe	29

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

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1200
- C:\Users\Admin\AppData\Local\Temp\4cf0238cdd275a66de9ee1ea32e02ce3fc4bb6d33cf9bdc1ba39c6c58789830e.exe
  "C:\Users\Admin\AppData\Local\Temp\4cf0238cdd275a66de9ee1ea32e02ce3fc4bb6d33cf9bdc1ba39c6c58789830e.exe"
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2244
- - 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:1948
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:2216

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
22KB

MD5
a4aa954ab97af883747bff14033ace74

SHA1
bb4e2676183314f949fba72181ebb36a0f8e08b1

SHA256
66bf1dd20a3d7f73a3edeb9d76a1c1d6be8d0fb1d645e6346f3d7a0d78d6ce4a

SHA512
5fa196b75c36c799348ad72bf33af5152f271d5547c69ec830c796239a1daaea60ebd62e855f6ad40388a12c2c7c3d8ea706398fc76f2c2e64ffdd5292d2144b

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

Filesize
23KB

MD5
0abee37e841ec38d9b0b67e39f34d4a8

SHA1
094aa1df2a364d51164008b42d1b4e0d11039027

SHA256
596da86c1024603ccada05af7f1a12f24a63af7fe68d82c1d9f633bb926f1ab8

SHA512
ebd0a0d9686c2c361eec1fa683da7eead3c5dcda8e450997b82cfe48b2f86db6e98f690351fe9938634ce11150817bff4b66046c523acc0b323adc7ee7b319f5

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

Filesize
20KB

MD5
02fc12942ca3aade3adb4b3c30524d4e

SHA1
486cc3e5f7f48cd55f8e19e554802cfc571e2c1c

SHA256
4cf0238cdd275a66de9ee1ea32e02ce3fc4bb6d33cf9bdc1ba39c6c58789830e

SHA512
f720ef88792e967a57e1db265d109033aea71968d394ffa0fab5fad0029d2bd9074282c7036f34401c27d4b40748364e825652745f3ea443035bc67b46ffc753

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

Filesize
1KB

MD5
b10b13206b0f2cf3968050072f6979bf

SHA1
699db21ba9cecf3f13ac3d76e22cfa41aa94da80

SHA256
0eef3217095cb97b695c434e74d6314bf9e869a013d6e9c88e58c34576a276b4

SHA512
d33bfd931be6676539507a69101d99fa4c5ef36b12422bd11f063b9b6a47b7444f6c4ad5f35e044714fdb872e96cd9fddf049e8329af1219483887f6ac5f4a5d

Download Submit
memory/1948-20-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1948-60-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2216-26-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2244-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2244-12-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2244-5-0x0000000000320000-0x0000000000331000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads