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
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{464D4544-4658-4645-464D-454446584645}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{464D4544-4658-4645-464D-454446584645}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{464D4544-4658-4645-464D-454446584645}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{464D4544-4658-4645-464D-454446584645}\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
2384	rmass.exe
2176	rmass.exe

Loads dropped DLL 3 IoCs

pid	Process
2028	3c9fd13c8e6028d8d15ab4c21ff275b0N.exe
2028	3c9fd13c8e6028d8d15ab4c21ff275b0N.exe
2384	rmass.exe

UPX packed file 7 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2028-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x0007000000012117-4.dat	upx
behavioral1/memory/2028-11-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2384-13-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2384-59-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2176-60-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2384-120-0x0000000000400000-0x0000000000411000-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 opened for modification	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	3c9fd13c8e6028d8d15ab4c21ff275b0N.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 opened for modification	C:\Windows\SysWOW64\rmass.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\aset32.exe	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 4 IoCs

pid	Process
2384	rmass.exe
2384	rmass.exe
2384	rmass.exe
2176	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2028	3c9fd13c8e6028d8d15ab4c21ff275b0N.exe
Token: SeDebugPrivilege	2384	rmass.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2028 wrote to memory of 2384	2028	3c9fd13c8e6028d8d15ab4c21ff275b0N.exe	30
PID 2028 wrote to memory of 2384	2028	3c9fd13c8e6028d8d15ab4c21ff275b0N.exe	30
PID 2028 wrote to memory of 2384	2028	3c9fd13c8e6028d8d15ab4c21ff275b0N.exe	30
PID 2028 wrote to memory of 2384	2028	3c9fd13c8e6028d8d15ab4c21ff275b0N.exe	30
PID 2384 wrote to memory of 432	2384	rmass.exe	5
PID 2384 wrote to memory of 1244	2384	rmass.exe	21
PID 2384 wrote to memory of 2176	2384	rmass.exe	31
PID 2384 wrote to memory of 2176	2384	rmass.exe	31
PID 2384 wrote to memory of 2176	2384	rmass.exe	31
PID 2384 wrote to memory of 2176	2384	rmass.exe	31

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

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1244
- C:\Users\Admin\AppData\Local\Temp\3c9fd13c8e6028d8d15ab4c21ff275b0N.exe
  "C:\Users\Admin\AppData\Local\Temp\3c9fd13c8e6028d8d15ab4c21ff275b0N.exe"
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2028
- - 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
    - 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:2384
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:2176

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

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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
6d9dc4d7ea6a79027ecdb289c78fee32

SHA1
6563650dac0eccd71a17ced89fd04f2f0aec4938

SHA256
b7b1952cb15602e237f2a35906717a10c1656bc40a9a8b18498198498d7330d7

SHA512
e6bf1d1a70e6c81c3ab4d252b84bf5e7c6c1eed8277be8d9cfb0ae70a006e6e80d7fda84c6e8c53d3ed8264264b1476369046d9535d2f2ca44cd66d03e08c327

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

Filesize
24KB

MD5
ddbbdc03d9381768e90e3c76bd4e44d5

SHA1
d668b2d8c713a8712a228b08b8ee18570cc79444

SHA256
7182686c1ea71463709167921c2c4850b4e9216c113a804c70be9a979d04dbb3

SHA512
090e35136ca4db3db67bc8ff9eb8d83f9347ed6c5a4bb15ac689d285df1ea4e437bd015afd0591d2fc2179c0b9f6cc5f0c12b0b285a4a8730ee2fc6bb6c72a5f

Download Submit
\Windows\SysWOW64\rmass.exe

Filesize
21KB

MD5
3c9fd13c8e6028d8d15ab4c21ff275b0

SHA1
aa851ee9fec5a15bb9066a0577414209865d04d6

SHA256
4bae843a0762b39027fe464a19c0fd05277bb1595cce5e5849ab6abfb3216144

SHA512
c6a64a75df0d67965bc7f31b9674fd60fc2ed16374c2f43f65891e5dabf756888f8e3221cb8ea494461d918f12ba315b0a3dcebf865cb4512a893edae018f347

Download Submit
memory/2028-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2028-11-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2176-60-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2384-13-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2384-25-0x00000000003E0000-0x00000000003F1000-memory.dmp

Filesize
68KB

Download
memory/2384-59-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2384-120-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads