a4ca4ee77ab1f9535276471ed2ac831421648201771920a4c700c7d307eb459e

Analysis

max time kernel
149s
max time network
125s
platform
windows7_x64
resource
win7-20231020-en
resource tags

arch:x64arch:x86image:win7-20231020-enlocale:en-usos:windows7-x64system
submitted
04/11/2023, 15:58

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General

Target

NEAS.1d216b068ab71ecca2551e8bb57e02d7.exe
Size

19KB
MD5

1d216b068ab71ecca2551e8bb57e02d7
SHA1

f923383e8c0f472822d92513b8e990140555146b
SHA256

a4ca4ee77ab1f9535276471ed2ac831421648201771920a4c700c7d307eb459e
SHA512

d8c05ac93cd0823acede9deed8e67b13b7fb6a1739c70fe1447c024619a48cc40495fc822e829f34873a4e3bce3a28df80d9ba8e1f5a8ce6b931b7d555bce092
SSDEEP

384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvXKN:rRkiLw3HsDSARGG/6N

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 (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{544C4944-5551-4351-544C-494455514351}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	rmass.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{544C4944-5551-4351-544C-494455514351}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{544C4944-5551-4351-544C-494455514351}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{544C4944-5551-4351-544C-494455514351}\IsInstalled = "1"	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
2528	rmass.exe
2792	rmass.exe

Loads dropped DLL 3 IoCs

pid	Process
2544	NEAS.1d216b068ab71ecca2551e8bb57e02d7.exe
2544	NEAS.1d216b068ab71ecca2551e8bb57e02d7.exe
2528	rmass.exe

UPX packed file 12 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2544-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x000d00000001201f-4.dat	upx
behavioral1/files/0x000d00000001201f-7.dat	upx
behavioral1/files/0x000d00000001201f-24.dat	upx
behavioral1/memory/2528-22-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x000d00000001201f-13.dat	upx
behavioral1/files/0x000d00000001201f-12.dat	upx
behavioral1/memory/2544-10-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x000d00000001201f-23.dat	upx
behavioral1/files/0x000d00000001201f-6.dat	upx
behavioral1/memory/2792-26-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2528-52-0x0000000000400000-0x0000000000411000-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
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\rmass.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	NEAS.1d216b068ab71ecca2551e8bb57e02d7.exe
File opened for modification	C:\Windows\SysWOW64\ntdbg.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 created	C:\Windows\SysWOW64\rmass.exe	NEAS.1d216b068ab71ecca2551e8bb57e02d7.exe
File created	C:\Windows\SysWOW64\ntdbg.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\ahuy.exe	rmass.exe
File created	C:\Windows\SysWOW64\ahuy.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
2528	rmass.exe
2528	rmass.exe
2528	rmass.exe
2792	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2544	NEAS.1d216b068ab71ecca2551e8bb57e02d7.exe
Token: SeDebugPrivilege	2528	rmass.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2544 wrote to memory of 2528	2544	NEAS.1d216b068ab71ecca2551e8bb57e02d7.exe	28
PID 2544 wrote to memory of 2528	2544	NEAS.1d216b068ab71ecca2551e8bb57e02d7.exe	28
PID 2544 wrote to memory of 2528	2544	NEAS.1d216b068ab71ecca2551e8bb57e02d7.exe	28
PID 2544 wrote to memory of 2528	2544	NEAS.1d216b068ab71ecca2551e8bb57e02d7.exe	28
PID 2528 wrote to memory of 424	2528	rmass.exe	23
PID 2528 wrote to memory of 1280	2528	rmass.exe	10
PID 2528 wrote to memory of 2792	2528	rmass.exe	29
PID 2528 wrote to memory of 2792	2528	rmass.exe	29
PID 2528 wrote to memory of 2792	2528	rmass.exe	29
PID 2528 wrote to memory of 2792	2528	rmass.exe	29

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1280
- C:\Users\Admin\AppData\Local\Temp\NEAS.1d216b068ab71ecca2551e8bb57e02d7.exe
  "C:\Users\Admin\AppData\Local\Temp\NEAS.1d216b068ab71ecca2551e8bb57e02d7.exe"
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2544
- - 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:2528
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:2792

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:424

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Defense Evasion

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Modify Registry

T1112

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
21KB

MD5
e81d2d61ce596713398dff8188b24c13

SHA1
d27030e78f5dc70ad2be802268d8bc3e0e2d2e5c

SHA256
300861862cf9eedc8ab587921fcd2d651b3245df91ceb79d63057ffd1dc4d020

SHA512
0bd10b1253d0225fff49a162c95315d9ee5d6451e3d0fc79ee253d36b27da033985ba6b9141987967db9e9c14885f1984e62a33807776b3a3183e222ae445fca

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

Filesize
22KB

MD5
db2a8bdea2f1116517743f55786d8275

SHA1
b80407f99af886287688831dc6ce14616b77360f

SHA256
74db6c47e465a47f4596084c1b2b10eb1d2749d2d78698d692a250a01170fd58

SHA512
7acc69be8226b807e80d7822389ba0a6b631804808355546a1402fc6f4d462c67996b3490f7e1f7f9d142d0f59b7e526b4e569ec1cd37249c437d85b1463051c

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

Filesize
19KB

MD5
1d216b068ab71ecca2551e8bb57e02d7

SHA1
f923383e8c0f472822d92513b8e990140555146b

SHA256
a4ca4ee77ab1f9535276471ed2ac831421648201771920a4c700c7d307eb459e

SHA512
d8c05ac93cd0823acede9deed8e67b13b7fb6a1739c70fe1447c024619a48cc40495fc822e829f34873a4e3bce3a28df80d9ba8e1f5a8ce6b931b7d555bce092

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

Filesize
19KB

MD5
1d216b068ab71ecca2551e8bb57e02d7

SHA1
f923383e8c0f472822d92513b8e990140555146b

SHA256
a4ca4ee77ab1f9535276471ed2ac831421648201771920a4c700c7d307eb459e

SHA512
d8c05ac93cd0823acede9deed8e67b13b7fb6a1739c70fe1447c024619a48cc40495fc822e829f34873a4e3bce3a28df80d9ba8e1f5a8ce6b931b7d555bce092

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

Filesize
19KB

MD5
1d216b068ab71ecca2551e8bb57e02d7

SHA1
f923383e8c0f472822d92513b8e990140555146b

SHA256
a4ca4ee77ab1f9535276471ed2ac831421648201771920a4c700c7d307eb459e

SHA512
d8c05ac93cd0823acede9deed8e67b13b7fb6a1739c70fe1447c024619a48cc40495fc822e829f34873a4e3bce3a28df80d9ba8e1f5a8ce6b931b7d555bce092

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

Filesize
19KB

MD5
1d216b068ab71ecca2551e8bb57e02d7

SHA1
f923383e8c0f472822d92513b8e990140555146b

SHA256
a4ca4ee77ab1f9535276471ed2ac831421648201771920a4c700c7d307eb459e

SHA512
d8c05ac93cd0823acede9deed8e67b13b7fb6a1739c70fe1447c024619a48cc40495fc822e829f34873a4e3bce3a28df80d9ba8e1f5a8ce6b931b7d555bce092

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

Filesize
1KB

MD5
b10b13206b0f2cf3968050072f6979bf

SHA1
699db21ba9cecf3f13ac3d76e22cfa41aa94da80

SHA256
0eef3217095cb97b695c434e74d6314bf9e869a013d6e9c88e58c34576a276b4

SHA512
d33bfd931be6676539507a69101d99fa4c5ef36b12422bd11f063b9b6a47b7444f6c4ad5f35e044714fdb872e96cd9fddf049e8329af1219483887f6ac5f4a5d

Download Submit
\Windows\SysWOW64\rmass.exe

Filesize
19KB

MD5
1d216b068ab71ecca2551e8bb57e02d7

SHA1
f923383e8c0f472822d92513b8e990140555146b

SHA256
a4ca4ee77ab1f9535276471ed2ac831421648201771920a4c700c7d307eb459e

SHA512
d8c05ac93cd0823acede9deed8e67b13b7fb6a1739c70fe1447c024619a48cc40495fc822e829f34873a4e3bce3a28df80d9ba8e1f5a8ce6b931b7d555bce092

Download Submit
\Windows\SysWOW64\rmass.exe

Filesize
19KB

MD5
1d216b068ab71ecca2551e8bb57e02d7

SHA1
f923383e8c0f472822d92513b8e990140555146b

SHA256
a4ca4ee77ab1f9535276471ed2ac831421648201771920a4c700c7d307eb459e

SHA512
d8c05ac93cd0823acede9deed8e67b13b7fb6a1739c70fe1447c024619a48cc40495fc822e829f34873a4e3bce3a28df80d9ba8e1f5a8ce6b931b7d555bce092

Download Submit
\Windows\SysWOW64\rmass.exe

Filesize
19KB

MD5
1d216b068ab71ecca2551e8bb57e02d7

SHA1
f923383e8c0f472822d92513b8e990140555146b

SHA256
a4ca4ee77ab1f9535276471ed2ac831421648201771920a4c700c7d307eb459e

SHA512
d8c05ac93cd0823acede9deed8e67b13b7fb6a1739c70fe1447c024619a48cc40495fc822e829f34873a4e3bce3a28df80d9ba8e1f5a8ce6b931b7d555bce092

Download Submit
memory/2528-22-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2528-52-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2528-25-0x00000000003A0000-0x00000000003B1000-memory.dmp

Filesize
68KB

Download
memory/2544-11-0x0000000000320000-0x0000000000331000-memory.dmp

Filesize
68KB

Download
memory/2544-51-0x0000000000320000-0x0000000000331000-memory.dmp

Filesize
68KB

Download
memory/2544-10-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2544-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2792-26-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download