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\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

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\{4E4E594A-5a41-4850-4E4E-594A5A414850}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4E4E594A-5a41-4850-4E4E-594A5A414850}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4E4E594A-5a41-4850-4E4E-594A5A414850}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4E4E594A-5a41-4850-4E4E-594A5A414850}\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
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
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe	rmass.exe

Executes dropped EXE 2 IoCs

pid	Process
2172	rmass.exe
2716	rmass.exe

Loads dropped DLL 3 IoCs

pid	Process
1780	2ef8d4c32bf741fe4e44576b2e9a5020N.exe
1780	2ef8d4c32bf741fe4e44576b2e9a5020N.exe
2172	rmass.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral1/files/0x000b00000001225f-1.dat	upx
behavioral1/memory/2172-9-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2716-22-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2172-56-0x0000000000400000-0x0000000000411000-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
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 opened for modification	C:\Windows\SysWOW64\idbg32.exe	rmass.exe
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\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\aset32.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\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\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 4 IoCs

pid	Process
2172	rmass.exe
2172	rmass.exe
2172	rmass.exe
2716	rmass.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2172	rmass.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1780 wrote to memory of 2172	1780	2ef8d4c32bf741fe4e44576b2e9a5020N.exe	31
PID 1780 wrote to memory of 2172	1780	2ef8d4c32bf741fe4e44576b2e9a5020N.exe	31
PID 1780 wrote to memory of 2172	1780	2ef8d4c32bf741fe4e44576b2e9a5020N.exe	31
PID 1780 wrote to memory of 2172	1780	2ef8d4c32bf741fe4e44576b2e9a5020N.exe	31
PID 2172 wrote to memory of 432	2172	rmass.exe	5
PID 2172 wrote to memory of 1124	2172	rmass.exe	20
PID 2172 wrote to memory of 2716	2172	rmass.exe	32
PID 2172 wrote to memory of 2716	2172	rmass.exe	32
PID 2172 wrote to memory of 2716	2172	rmass.exe	32
PID 2172 wrote to memory of 2716	2172	rmass.exe	32

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

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1124
- C:\Users\Admin\AppData\Local\Temp\2ef8d4c32bf741fe4e44576b2e9a5020N.exe
  "C:\Users\Admin\AppData\Local\Temp\2ef8d4c32bf741fe4e44576b2e9a5020N.exe"
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - Suspicious use of WriteProcessMemory
  PID:1780
- - 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
    - 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:2172
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:2716

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

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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
1bc343a74626c14a6aa79d0afba47d33

SHA1
068857862b2f8108a4795012cff6243388fdd646

SHA256
0fb122210ce25a4d8d0c0e48418ec2dac6e11f62dfa5f186e2a197bb742782b5

SHA512
18362c326669a7c135d499bae99011e75335615d6be9f55fe1ed0c4e76c402794e03ba030663da83f637512de47e15ca2f3d7bfa247ad1f24a724299c56c6f9e

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

Filesize
24KB

MD5
b9e96bd1b4e34967ac70285946e09e1f

SHA1
f946960bbbd7ddb8f25b81d733601a8a195f8774

SHA256
fe50a5ba18ae45e61e009533ee47011bb66bdcf556c0612f4e3b6ab1065966e2

SHA512
9c9fd000b15d3f043b0d09c62e368a4aef50c91e1de9f100dbe2095cf015fb55674ea5ed1511f8b6654ecfe2a933420068102c465ec7c67539cc30c7863559ff

Download Submit
\Windows\SysWOW64\rmass.exe

Filesize
21KB

MD5
99eb92427751484be0ae1f8bcd5b6f5a

SHA1
592f096d672f121d2669419b0893a6b758189f31

SHA256
1d2585db65cd8d9eaca0e604f8c1db92793d624335e13bbe437411b710a1cfae

SHA512
0fd0d4f850d81231747c381ac30bd02be07d0ce11f6beb675953e120aea86949a99796eac2f10427ff7526fd4f1d90dd4a8acc943295259482cc6ec415011527

Download Submit
memory/1780-7-0x0000000000400000-0x0000000000403000-memory.dmp

Filesize
12KB

Download
memory/2172-9-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2172-21-0x0000000000360000-0x0000000000371000-memory.dmp

Filesize
68KB

Download
memory/2172-56-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2172-96-0x0000000000360000-0x0000000000371000-memory.dmp

Filesize
68KB

Download
memory/2716-22-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads