f3dfc3a226bc2bf693e09731e65f560b5d58d3eb38e7b4b938a5458fa38fd0a2

Analysis

max time kernel
150s
max time network
144s
platform
windows7_x64
resource
win7-20231020-en
resource tags

arch:x64arch:x86image:win7-20231020-enlocale:en-usos:windows7-x64system
submitted
15/11/2023, 00:37

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General

Target

NEAS.8d513ab2c8a5598c7cecb1c8a21bbbd0.exe
Size

19KB
MD5

8d513ab2c8a5598c7cecb1c8a21bbbd0
SHA1

8ebd6ad60f2fdc544252010f6fd8ada1368a36aa
SHA256

f3dfc3a226bc2bf693e09731e65f560b5d58d3eb38e7b4b938a5458fa38fd0a2
SHA512

62eb6a9aa238196b2456cf294f26001e65589c731549ce0d1a99bd6ea5a341517f762242d8601f851563d1a26519be48ef50cdc2cbeb4e4d9b0d16772665e20f
SSDEEP

384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvXOrHV:rRkiLw3HsDSARGG/+r1

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
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{5552554F-5a57-4746-5552-554F5A574746}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{5552554F-5a57-4746-5552-554F5A574746}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{5552554F-5a57-4746-5552-554F5A574746}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{5552554F-5a57-4746-5552-554F5A574746}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	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
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
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe\0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890 = "a"	rmass.exe

Executes dropped EXE 2 IoCs

pid	Process
2856	rmass.exe
2836	rmass.exe

Loads dropped DLL 3 IoCs

pid	Process
1736	NEAS.8d513ab2c8a5598c7cecb1c8a21bbbd0.exe
1736	NEAS.8d513ab2c8a5598c7cecb1c8a21bbbd0.exe
2856	rmass.exe

UPX packed file 12 IoCs

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

upx

resource	yara_rule
behavioral1/memory/1736-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x00070000000120bd-4.dat	upx
behavioral1/files/0x00070000000120bd-23.dat	upx
behavioral1/files/0x00070000000120bd-12.dat	upx
behavioral1/memory/2836-25-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2856-21-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x00070000000120bd-11.dat	upx
behavioral1/files/0x00070000000120bd-22.dat	upx
behavioral1/memory/1736-10-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x00070000000120bd-7.dat	upx
behavioral1/files/0x00070000000120bd-6.dat	upx
behavioral1/memory/2856-59-0x0000000000400000-0x0000000000411000-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\winrnt.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\aset32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	NEAS.8d513ab2c8a5598c7cecb1c8a21bbbd0.exe
File created	C:\Windows\SysWOW64\rmass.exe	NEAS.8d513ab2c8a5598c7cecb1c8a21bbbd0.exe
File opened for modification	C:\Windows\SysWOW64\ntdbg.exe	rmass.exe
File created	C:\Windows\SysWOW64\ahuy.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
File opened for modification	C:\Windows\SysWOW64\rmass.exe	rmass.exe
File created	C:\Windows\SysWOW64\ntdbg.exe	rmass.exe
File opened for modification	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
2856	rmass.exe
2856	rmass.exe
2856	rmass.exe
2836	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1736	NEAS.8d513ab2c8a5598c7cecb1c8a21bbbd0.exe
Token: SeDebugPrivilege	2856	rmass.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1736 wrote to memory of 2856	1736	NEAS.8d513ab2c8a5598c7cecb1c8a21bbbd0.exe	17
PID 1736 wrote to memory of 2856	1736	NEAS.8d513ab2c8a5598c7cecb1c8a21bbbd0.exe	17
PID 1736 wrote to memory of 2856	1736	NEAS.8d513ab2c8a5598c7cecb1c8a21bbbd0.exe	17
PID 1736 wrote to memory of 2856	1736	NEAS.8d513ab2c8a5598c7cecb1c8a21bbbd0.exe	17
PID 2856 wrote to memory of 420	2856	rmass.exe	3
PID 2856 wrote to memory of 1240	2856	rmass.exe	16
PID 2856 wrote to memory of 2836	2856	rmass.exe	18
PID 2856 wrote to memory of 2836	2856	rmass.exe	18
PID 2856 wrote to memory of 2836	2856	rmass.exe	18
PID 2856 wrote to memory of 2836	2856	rmass.exe	18

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:420

C:\Users\Admin\AppData\Local\Temp\NEAS.8d513ab2c8a5598c7cecb1c8a21bbbd0.exe
"C:\Users\Admin\AppData\Local\Temp\NEAS.8d513ab2c8a5598c7cecb1c8a21bbbd0.exe"
1⤵
- Loads dropped DLL
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1736
- C:\Windows\SysWOW64\rmass.exe
  "C:\Windows\system32\rmass.exe"
  2⤵
  - 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:2856
- - C:\Windows\SysWOW64\rmass.exe
    --k33p
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    PID:2836

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1240

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
ac464feb8900302e7601794540de6d3e

SHA1
57712fbf5b0d3262de4c13585b3d8a093be9efe8

SHA256
7ebeebb787224fe026935352c25c1275dbd7d8088ed96217bad8f1e3675f59c1

SHA512
6d941864ec386e93e4383735d79dbdb193880c9ea7aef0203e5007e8f3ab2bdcbdbebb5cd47abba3189f63b42f22e3140b00503f595d72b841ad6187ef131dc4

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

Filesize
22KB

MD5
b80c58006daceb1985216b66bc537d86

SHA1
8e9e1de39a777eecff1477345c4cc3da6d9016f1

SHA256
a2bb1b1d2a8cea37e2350850f6e15c32e2e32867f722bc5ad880d0eea551fa73

SHA512
4ef6c032d22e37aa8f3da950f2a9f2d27e32c82b59e3f2606b1ca1171e0ca8cb363e5582d4a0614314c295aa23a18a24bf0257abb95f378a2056c1f4ff25e6d1

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

Filesize
19KB

MD5
8d513ab2c8a5598c7cecb1c8a21bbbd0

SHA1
8ebd6ad60f2fdc544252010f6fd8ada1368a36aa

SHA256
f3dfc3a226bc2bf693e09731e65f560b5d58d3eb38e7b4b938a5458fa38fd0a2

SHA512
62eb6a9aa238196b2456cf294f26001e65589c731549ce0d1a99bd6ea5a341517f762242d8601f851563d1a26519be48ef50cdc2cbeb4e4d9b0d16772665e20f

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

Filesize
19KB

MD5
8d513ab2c8a5598c7cecb1c8a21bbbd0

SHA1
8ebd6ad60f2fdc544252010f6fd8ada1368a36aa

SHA256
f3dfc3a226bc2bf693e09731e65f560b5d58d3eb38e7b4b938a5458fa38fd0a2

SHA512
62eb6a9aa238196b2456cf294f26001e65589c731549ce0d1a99bd6ea5a341517f762242d8601f851563d1a26519be48ef50cdc2cbeb4e4d9b0d16772665e20f

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

Filesize
19KB

MD5
8d513ab2c8a5598c7cecb1c8a21bbbd0

SHA1
8ebd6ad60f2fdc544252010f6fd8ada1368a36aa

SHA256
f3dfc3a226bc2bf693e09731e65f560b5d58d3eb38e7b4b938a5458fa38fd0a2

SHA512
62eb6a9aa238196b2456cf294f26001e65589c731549ce0d1a99bd6ea5a341517f762242d8601f851563d1a26519be48ef50cdc2cbeb4e4d9b0d16772665e20f

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

Filesize
19KB

MD5
8d513ab2c8a5598c7cecb1c8a21bbbd0

SHA1
8ebd6ad60f2fdc544252010f6fd8ada1368a36aa

SHA256
f3dfc3a226bc2bf693e09731e65f560b5d58d3eb38e7b4b938a5458fa38fd0a2

SHA512
62eb6a9aa238196b2456cf294f26001e65589c731549ce0d1a99bd6ea5a341517f762242d8601f851563d1a26519be48ef50cdc2cbeb4e4d9b0d16772665e20f

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
8d513ab2c8a5598c7cecb1c8a21bbbd0

SHA1
8ebd6ad60f2fdc544252010f6fd8ada1368a36aa

SHA256
f3dfc3a226bc2bf693e09731e65f560b5d58d3eb38e7b4b938a5458fa38fd0a2

SHA512
62eb6a9aa238196b2456cf294f26001e65589c731549ce0d1a99bd6ea5a341517f762242d8601f851563d1a26519be48ef50cdc2cbeb4e4d9b0d16772665e20f

Download Submit
\Windows\SysWOW64\rmass.exe

Filesize
19KB

MD5
8d513ab2c8a5598c7cecb1c8a21bbbd0

SHA1
8ebd6ad60f2fdc544252010f6fd8ada1368a36aa

SHA256
f3dfc3a226bc2bf693e09731e65f560b5d58d3eb38e7b4b938a5458fa38fd0a2

SHA512
62eb6a9aa238196b2456cf294f26001e65589c731549ce0d1a99bd6ea5a341517f762242d8601f851563d1a26519be48ef50cdc2cbeb4e4d9b0d16772665e20f

Download Submit
\Windows\SysWOW64\rmass.exe

Filesize
19KB

MD5
8d513ab2c8a5598c7cecb1c8a21bbbd0

SHA1
8ebd6ad60f2fdc544252010f6fd8ada1368a36aa

SHA256
f3dfc3a226bc2bf693e09731e65f560b5d58d3eb38e7b4b938a5458fa38fd0a2

SHA512
62eb6a9aa238196b2456cf294f26001e65589c731549ce0d1a99bd6ea5a341517f762242d8601f851563d1a26519be48ef50cdc2cbeb4e4d9b0d16772665e20f

Download Submit
memory/1736-10-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1736-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2836-25-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2856-21-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2856-24-0x0000000000320000-0x0000000000331000-memory.dmp

Filesize
68KB

Download
memory/2856-59-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2856-96-0x0000000000320000-0x0000000000331000-memory.dmp

Filesize
68KB

Download