55e7a44ac6dc26b97434d40e191f05df70a502979fe6ef5ab6d98cdcaa222e70

Analysis

max time kernel
150s
max time network
123s
platform
windows7_x64
resource
win7-20231023-en
resource tags

arch:x64arch:x86image:win7-20231023-enlocale:en-usos:windows7-x64system
submitted
01/11/2023, 14:11

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General

Target

NEAS.6cca7485f82cbe1e96e8e1e59585ac60.exe
Size

19KB
MD5

6cca7485f82cbe1e96e8e1e59585ac60
SHA1

39c28383269a33b97066960b8462d4348bee4a76
SHA256

55e7a44ac6dc26b97434d40e191f05df70a502979fe6ef5ab6d98cdcaa222e70
SHA512

01660c050ea828c32de37edc7119227a199a5ad95e492a9e67009b980a71c78e36582d1d4fcb091edfb6fde7869e112bbe831c0776affba54a2f41f3969385f5
SSDEEP

384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvXMBv:rRkiLw3HsDSARGG/8Bv

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\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

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\{41484C42-5259-4a4f-4148-4C4252594a4f}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	rmass.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{41484C42-5259-4a4f-4148-4C4252594a4f}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{41484C42-5259-4a4f-4148-4C4252594a4f}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{41484C42-5259-4a4f-4148-4C4252594a4f}\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
2460	rmass.exe
2584	rmass.exe

Loads dropped DLL 3 IoCs

pid	Process
2228	NEAS.6cca7485f82cbe1e96e8e1e59585ac60.exe
2228	NEAS.6cca7485f82cbe1e96e8e1e59585ac60.exe
2460	rmass.exe

UPX packed file 12 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2228-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x000a000000012025-4.dat	upx
behavioral1/memory/2228-10-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x000a000000012025-13.dat	upx
behavioral1/files/0x000a000000012025-12.dat	upx
behavioral1/memory/2460-23-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x000a000000012025-7.dat	upx
behavioral1/files/0x000a000000012025-22.dat	upx
behavioral1/files/0x000a000000012025-6.dat	upx
behavioral1/files/0x000a000000012025-24.dat	upx
behavioral1/memory/2460-52-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2584-57-0x0000000000400000-0x0000000000411000-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\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
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\FirewallDisableNotify = "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\rmass.exe	NEAS.6cca7485f82cbe1e96e8e1e59585ac60.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\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 opened for modification	C:\Windows\SysWOW64\idbg32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	NEAS.6cca7485f82cbe1e96e8e1e59585ac60.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\aset32.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
2460	rmass.exe
2460	rmass.exe
2460	rmass.exe
2584	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2228	NEAS.6cca7485f82cbe1e96e8e1e59585ac60.exe
Token: SeDebugPrivilege	2460	rmass.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2228 wrote to memory of 2460	2228	NEAS.6cca7485f82cbe1e96e8e1e59585ac60.exe	28
PID 2228 wrote to memory of 2460	2228	NEAS.6cca7485f82cbe1e96e8e1e59585ac60.exe	28
PID 2228 wrote to memory of 2460	2228	NEAS.6cca7485f82cbe1e96e8e1e59585ac60.exe	28
PID 2228 wrote to memory of 2460	2228	NEAS.6cca7485f82cbe1e96e8e1e59585ac60.exe	28
PID 2460 wrote to memory of 424	2460	rmass.exe	3
PID 2460 wrote to memory of 1292	2460	rmass.exe	11
PID 2460 wrote to memory of 2584	2460	rmass.exe	29
PID 2460 wrote to memory of 2584	2460	rmass.exe	29
PID 2460 wrote to memory of 2584	2460	rmass.exe	29
PID 2460 wrote to memory of 2584	2460	rmass.exe	29

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

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1292
- C:\Users\Admin\AppData\Local\Temp\NEAS.6cca7485f82cbe1e96e8e1e59585ac60.exe
  "C:\Users\Admin\AppData\Local\Temp\NEAS.6cca7485f82cbe1e96e8e1e59585ac60.exe"
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2228
- - 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:2460
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:2584

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
d2948c1ee2257224062147cf522a6252

SHA1
701a9a3725dbfdf096b9ed0d66d6da0d68cef32f

SHA256
c6effc006a74d6274f29bb0ba55f0fa12a99a6060aef65f2f0f41c64b86211f8

SHA512
00ac6fc5ddbf30419aff9dba65581eb3ec4dcdc2c3994e9114d65713eafd383911e1ef2d84a8d645fa976e634135773383896cf1bf6abac4f52ba2a68cff7138

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

Filesize
22KB

MD5
fc0596e36732cfcd9ccd6100a324abff

SHA1
a4b2bd9707d794ce720993b4e669a9f43fd76c59

SHA256
0f370d6bb5231979844b284c96a3c7e230c3c3a55feb39d0bdd2e57e76ff6302

SHA512
4ede97d4c103e6e324feb853e13224e40629deaa6d08da9ab298086825bcceb4411e10d6d7572a753c82d92de86ebf54214332355cbc2a38fd11cecbae2f0564

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

Filesize
19KB

MD5
6cca7485f82cbe1e96e8e1e59585ac60

SHA1
39c28383269a33b97066960b8462d4348bee4a76

SHA256
55e7a44ac6dc26b97434d40e191f05df70a502979fe6ef5ab6d98cdcaa222e70

SHA512
01660c050ea828c32de37edc7119227a199a5ad95e492a9e67009b980a71c78e36582d1d4fcb091edfb6fde7869e112bbe831c0776affba54a2f41f3969385f5

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

Filesize
19KB

MD5
6cca7485f82cbe1e96e8e1e59585ac60

SHA1
39c28383269a33b97066960b8462d4348bee4a76

SHA256
55e7a44ac6dc26b97434d40e191f05df70a502979fe6ef5ab6d98cdcaa222e70

SHA512
01660c050ea828c32de37edc7119227a199a5ad95e492a9e67009b980a71c78e36582d1d4fcb091edfb6fde7869e112bbe831c0776affba54a2f41f3969385f5

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

Filesize
19KB

MD5
6cca7485f82cbe1e96e8e1e59585ac60

SHA1
39c28383269a33b97066960b8462d4348bee4a76

SHA256
55e7a44ac6dc26b97434d40e191f05df70a502979fe6ef5ab6d98cdcaa222e70

SHA512
01660c050ea828c32de37edc7119227a199a5ad95e492a9e67009b980a71c78e36582d1d4fcb091edfb6fde7869e112bbe831c0776affba54a2f41f3969385f5

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

Filesize
19KB

MD5
6cca7485f82cbe1e96e8e1e59585ac60

SHA1
39c28383269a33b97066960b8462d4348bee4a76

SHA256
55e7a44ac6dc26b97434d40e191f05df70a502979fe6ef5ab6d98cdcaa222e70

SHA512
01660c050ea828c32de37edc7119227a199a5ad95e492a9e67009b980a71c78e36582d1d4fcb091edfb6fde7869e112bbe831c0776affba54a2f41f3969385f5

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
6cca7485f82cbe1e96e8e1e59585ac60

SHA1
39c28383269a33b97066960b8462d4348bee4a76

SHA256
55e7a44ac6dc26b97434d40e191f05df70a502979fe6ef5ab6d98cdcaa222e70

SHA512
01660c050ea828c32de37edc7119227a199a5ad95e492a9e67009b980a71c78e36582d1d4fcb091edfb6fde7869e112bbe831c0776affba54a2f41f3969385f5

Download Submit
\Windows\SysWOW64\rmass.exe

Filesize
19KB

MD5
6cca7485f82cbe1e96e8e1e59585ac60

SHA1
39c28383269a33b97066960b8462d4348bee4a76

SHA256
55e7a44ac6dc26b97434d40e191f05df70a502979fe6ef5ab6d98cdcaa222e70

SHA512
01660c050ea828c32de37edc7119227a199a5ad95e492a9e67009b980a71c78e36582d1d4fcb091edfb6fde7869e112bbe831c0776affba54a2f41f3969385f5

Download Submit
\Windows\SysWOW64\rmass.exe

Filesize
19KB

MD5
6cca7485f82cbe1e96e8e1e59585ac60

SHA1
39c28383269a33b97066960b8462d4348bee4a76

SHA256
55e7a44ac6dc26b97434d40e191f05df70a502979fe6ef5ab6d98cdcaa222e70

SHA512
01660c050ea828c32de37edc7119227a199a5ad95e492a9e67009b980a71c78e36582d1d4fcb091edfb6fde7869e112bbe831c0776affba54a2f41f3969385f5

Download Submit
memory/2228-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2228-11-0x0000000000320000-0x0000000000331000-memory.dmp

Filesize
68KB

Download
memory/2228-10-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2460-23-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2460-52-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2584-57-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download