8def991589279e0d4169042e93b79ddce953443012fbd1c572d03efb2da56d75

General

Target

2ef8d4c32bf741fe4e44576b2e9a5020N.exe
Size

23KB
MD5

2ef8d4c32bf741fe4e44576b2e9a5020
SHA1

6dc03a40a9251ccc48b9c55f5a7af9097eb5d18a
SHA256

8def991589279e0d4169042e93b79ddce953443012fbd1c572d03efb2da56d75
SHA512

d04530a1e30b0f1b40a4717d7770749f0237bee2ea7e423b2a9c327f0880570b3040038a05934c493ea0818f4cf7cbe077fa79c3a8a3728cbf0a477c9f51f796
SSDEEP

384:jIz4ClC0Y2i/WqBfroAmbpXhA7qNHh9Ro7Eh6SjUbmc0FGc+RPV8A/L51qsLVn4:jIUGC0YPBfro7AuNHlogs5bmjMd8g5wp

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\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

Boot or Logon Autostart Execution: Active Setup 2 TTPs 4 IoCs

Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

persistence

Active Setup

T1547.014

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{51495642-4849-5154-5149-564248495154}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{51495642-4849-5154-5149-564248495154}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{51495642-4849-5154-5149-564248495154}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{51495642-4849-5154-5149-564248495154}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	rmass.exe

Drops file in Drivers directory 1 IoCs

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

Event Triggered Execution: Image File Execution Options Injection 1 TTPs 3 IoCs

persistence

Image File Execution Options Injection

T1546.012

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
4508	rmass.exe
628	rmass.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x0009000000023443-2.dat	upx
behavioral2/memory/4508-4-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/4508-48-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/628-49-0x0000000000400000-0x0000000000411000-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
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
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\{BC84DF00-BC38-9902-8082-6FCBF2D87A0B}\012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345 = "a"	rmass.exe

Drops file in System32 directory 12 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\rmass.exe	2ef8d4c32bf741fe4e44576b2e9a5020N.exe
File created	C:\Windows\SysWOW64\rmass.exe	2ef8d4c32bf741fe4e44576b2e9a5020N.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\winrnt.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\aset32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	rmass.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 created	C:\Windows\SysWOW64\RECOVER32.DLL	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\aset32.exe	rmass.exe
File opened for modification	C:\Program Files (x86)\Common Files\System\idbg32.exe	rmass.exe
File opened for modification	C:\Program Files (x86)\Common Files\System\winrnt.exe	rmass.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
4508	rmass.exe
4508	rmass.exe
4508	rmass.exe
4508	rmass.exe
4508	rmass.exe
4508	rmass.exe
628	rmass.exe
628	rmass.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4508	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1708 wrote to memory of 4508	1708	2ef8d4c32bf741fe4e44576b2e9a5020N.exe	84
PID 1708 wrote to memory of 4508	1708	2ef8d4c32bf741fe4e44576b2e9a5020N.exe	84
PID 1708 wrote to memory of 4508	1708	2ef8d4c32bf741fe4e44576b2e9a5020N.exe	84
PID 4508 wrote to memory of 628	4508	rmass.exe	85
PID 4508 wrote to memory of 628	4508	rmass.exe	85
PID 4508 wrote to memory of 628	4508	rmass.exe	85
PID 4508 wrote to memory of 616	4508	rmass.exe	5
PID 4508 wrote to memory of 3416	4508	rmass.exe	56

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:616

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3416
- C:\Users\Admin\AppData\Local\Temp\2ef8d4c32bf741fe4e44576b2e9a5020N.exe
  "C:\Users\Admin\AppData\Local\Temp\2ef8d4c32bf741fe4e44576b2e9a5020N.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of WriteProcessMemory
  PID:1708
- - C:\Windows\SysWOW64\rmass.exe
    "C:\Windows\SysWOW64\rmass.exe"
    3⤵
    - Windows security bypass
    - Boot or Logon Autostart Execution: Active Setup
    - Drops file in Drivers directory
    - Event Triggered Execution: Image File Execution Options Injection
    - 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:4508
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:628

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

2

T1547

Active Setup

1

T1547.014

Winlogon Helper DLL

1

T1547.004

Event Triggered Execution

1

T1546

Image File Execution Options Injection

1

T1546.012

Privilege Escalation

Boot or Logon Autostart Execution

2

T1547

Active Setup

1

T1547.014

Winlogon Helper DLL

1

T1547.004

Event Triggered Execution

1

T1546

Image File Execution Options Injection

1

T1546.012

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
23KB

MD5
107cfae1b46cd93af816691a59cf4b98

SHA1
e58eecd539f9e1df0bd827e67c1a2dfbb737eb11

SHA256
67bb0a2fa9ea69494e8957ade7ef73ce763b2ddb2a84c10e41ae17e322a7f39d

SHA512
74152448a86dab2a2b9b2d29f2611580fdc23f1c3cf38ad798e553c5d9346bdfb530c1d0675175439d546eac03fe4643d0bb1a89b7e5725fc8ee386b04e39b57

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

Filesize
24KB

MD5
328f13adbb4ef07a40d2bdc011bda629

SHA1
876a5c470bd56ffa28d5b56edf6139c977f86561

SHA256
117c550a032b5a0dce6bd5b87e32c571a34e94d4e34849fa7bc83753a5956948

SHA512
85badb9af0b56ecdd024e4b33e47e906cd19a4d6ffd0041d41086f9805ae61e9f73492df5b6cc95be208348f5664e8495e6a75e7c09784a7fdccad844f1a1be1

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

Filesize
21KB

MD5
99eb92427751484be0ae1f8bcd5b6f5a

SHA1
592f096d672f121d2669419b0893a6b758189f31

SHA256
1d2585db65cd8d9eaca0e604f8c1db92793d624335e13bbe437411b710a1cfae

SHA512
0fd0d4f850d81231747c381ac30bd02be07d0ce11f6beb675953e120aea86949a99796eac2f10427ff7526fd4f1d90dd4a8acc943295259482cc6ec415011527

Download Submit
memory/628-49-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1708-3-0x0000000000400000-0x0000000000403000-memory.dmp

Filesize
12KB

Download
memory/4508-4-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4508-48-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads