4bae843a0762b39027fe464a19c0fd05277bb1595cce5e5849ab6abfb3216144

General

Target

3c9fd13c8e6028d8d15ab4c21ff275b0N.exe
Size

21KB
MD5

3c9fd13c8e6028d8d15ab4c21ff275b0
SHA1

aa851ee9fec5a15bb9066a0577414209865d04d6
SHA256

4bae843a0762b39027fe464a19c0fd05277bb1595cce5e5849ab6abfb3216144
SHA512

c6a64a75df0d67965bc7f31b9674fd60fc2ed16374c2f43f65891e5dabf756888f8e3221cb8ea494461d918f12ba315b0a3dcebf865cb4512a893edae018f347
SSDEEP

384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvXFLvl0vBbM:rRkiLw3HsDSARGG/nobM

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
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{53584143-4750-494e-5358-41434750494e}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	rmass.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{53584143-4750-494e-5358-41434750494e}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{53584143-4750-494e-5358-41434750494e}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{53584143-4750-494e-5358-41434750494e}\IsInstalled = "1"	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
4164	rmass.exe
2324	rmass.exe

UPX packed file 7 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1248-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/files/0x000a0000000234c0-5.dat	upx
behavioral2/memory/1248-7-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/4164-9-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/4164-55-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/2324-56-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/4164-116-0x0000000000400000-0x0000000000411000-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\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
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusOverride = "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 created	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\rmass.exe	rmass.exe
File created	C:\Windows\SysWOW64\rmass.exe	3c9fd13c8e6028d8d15ab4c21ff275b0N.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\RECOVER32.DLL	rmass.exe
File opened for modification	C:\Windows\SysWOW64\winrnt.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\idbg32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	3c9fd13c8e6028d8d15ab4c21ff275b0N.exe
File opened for modification	C:\Windows\SysWOW64\ahuy.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\RECOVER32.DLL	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
4164	rmass.exe
4164	rmass.exe
4164	rmass.exe
4164	rmass.exe
4164	rmass.exe
4164	rmass.exe
2324	rmass.exe
2324	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1248	3c9fd13c8e6028d8d15ab4c21ff275b0N.exe
Token: SeDebugPrivilege	4164	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1248 wrote to memory of 4164	1248	3c9fd13c8e6028d8d15ab4c21ff275b0N.exe	84
PID 1248 wrote to memory of 4164	1248	3c9fd13c8e6028d8d15ab4c21ff275b0N.exe	84
PID 1248 wrote to memory of 4164	1248	3c9fd13c8e6028d8d15ab4c21ff275b0N.exe	84
PID 4164 wrote to memory of 596	4164	rmass.exe	5
PID 4164 wrote to memory of 3500	4164	rmass.exe	56
PID 4164 wrote to memory of 2324	4164	rmass.exe	85
PID 4164 wrote to memory of 2324	4164	rmass.exe	85
PID 4164 wrote to memory of 2324	4164	rmass.exe	85

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:596

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3500
- C:\Users\Admin\AppData\Local\Temp\3c9fd13c8e6028d8d15ab4c21ff275b0N.exe
  "C:\Users\Admin\AppData\Local\Temp\3c9fd13c8e6028d8d15ab4c21ff275b0N.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1248
- - C:\Windows\SysWOW64\rmass.exe
    "C:\Windows\system32\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:4164
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:2324

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
ff7711596d0f9b281646aa93fd1f4675

SHA1
b1e6f3a6033d9cfaa156a3189406e29840179c21

SHA256
eff1d1c4c0af750963632174bd27b8cc02cbaf8161067549071f7889abc5a188

SHA512
f153b6e85a6fbb89ca666917113039aca993a390a459009cd2f87db65090d8c7812bcba53efc0d117eed9961df441578ec6bc243b631ece92037ac74f444aaa6

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

Filesize
24KB

MD5
1fd7d18bf858fd7cc3b1883a4c6038a4

SHA1
5a02347adcc0d3c4090677d35ec1920439aadc2d

SHA256
f4a4b0860c9090e88b5785bb1527da7f1b515a103611aae650293c7b783ae943

SHA512
910d195aa843164581647aebd0303f4eea7cf7b151d68bba722f195d94b9e66c3c22c26f81aab76bd2d5d98f5310655502d72180e7df42835fe920facf527659

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

Filesize
21KB

MD5
3c9fd13c8e6028d8d15ab4c21ff275b0

SHA1
aa851ee9fec5a15bb9066a0577414209865d04d6

SHA256
4bae843a0762b39027fe464a19c0fd05277bb1595cce5e5849ab6abfb3216144

SHA512
c6a64a75df0d67965bc7f31b9674fd60fc2ed16374c2f43f65891e5dabf756888f8e3221cb8ea494461d918f12ba315b0a3dcebf865cb4512a893edae018f347

Download Submit
memory/1248-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1248-7-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2324-56-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4164-9-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4164-55-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4164-116-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads