5831f24f6219e9db0161b6094662a08fae136b10d48e2329590e09f88170c6d4

Analysis

max time kernel
219s
max time network
152s
platform
windows7_x64
resource
win7-20230831-en
resource tags

arch:x64arch:x86image:win7-20230831-enlocale:en-usos:windows7-x64system
submitted
15-10-2023 19:37

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General

Target

4cbbbf59ae56255044c9235ad2bb35c0_exe32.exe
Size

20KB
MD5

4cbbbf59ae56255044c9235ad2bb35c0
SHA1

d3e12dd330bcf1118d1ac14be11bdad1f5ccfcce
SHA256

5831f24f6219e9db0161b6094662a08fae136b10d48e2329590e09f88170c6d4
SHA512

34e9324e0b8181f82e6a97abf38a4ff8112aeb6b392264c138dfac16ec2f298b16539948899d9f3fea2a8a060aeaf48d76600c7c8aa75ec97ccc243e50cbc0dd
SSDEEP

384:jIz4iNmMN4RbFnddsLzXmGF+y/aS4MT814Cw8j8bKIVMIyFeHI6G5/flLGEdlBF9:jIUimMeTddsf9F7Rj8tXQ8vGIDflLLdr

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

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\{584F4359-484b-5253-584F-4359484B5253}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{584F4359-484b-5253-584F-4359484B5253}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{584F4359-484b-5253-584F-4359484B5253}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{584F4359-484b-5253-584F-4359484B5253}\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
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
3020	rmass.exe
2516	rmass.exe

Loads dropped DLL 2 IoCs

pid	Process
2656	4cbbbf59ae56255044c9235ad2bb35c0_exe32.exe
2656	4cbbbf59ae56255044c9235ad2bb35c0_exe32.exe

UPX packed file 10 IoCs

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

upx

resource	yara_rule
behavioral1/files/0x000400000000fefe-1.dat	upx
behavioral1/memory/2656-2-0x0000000000020000-0x0000000000031000-memory.dmp	upx
behavioral1/files/0x000400000000fefe-7.dat	upx
behavioral1/files/0x000400000000fefe-4.dat	upx
behavioral1/memory/3020-10-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x000400000000fefe-9.dat	upx
behavioral1/files/0x000400000000fefe-11.dat	upx
behavioral1/files/0x000400000000fefe-12.dat	upx
behavioral1/memory/3020-17-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2516-43-0x0000000000400000-0x0000000000411000-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 opened for modification	C:\Windows\SysWOW64\rmass.exe	4cbbbf59ae56255044c9235ad2bb35c0_exe32.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\ahuy.exe	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\rmass.exe	4cbbbf59ae56255044c9235ad2bb35c0_exe32.exe
File created	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\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\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
2516	rmass.exe
3020	rmass.exe
3020	rmass.exe
3020	rmass.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3020	rmass.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2656 wrote to memory of 3020	2656	4cbbbf59ae56255044c9235ad2bb35c0_exe32.exe	27
PID 2656 wrote to memory of 3020	2656	4cbbbf59ae56255044c9235ad2bb35c0_exe32.exe	27
PID 2656 wrote to memory of 3020	2656	4cbbbf59ae56255044c9235ad2bb35c0_exe32.exe	27
PID 2656 wrote to memory of 3020	2656	4cbbbf59ae56255044c9235ad2bb35c0_exe32.exe	27
PID 3020 wrote to memory of 2516	3020	rmass.exe	28
PID 3020 wrote to memory of 2516	3020	rmass.exe	28
PID 3020 wrote to memory of 2516	3020	rmass.exe	28
PID 3020 wrote to memory of 2516	3020	rmass.exe	28
PID 3020 wrote to memory of 420	3020	rmass.exe	14
PID 3020 wrote to memory of 1204	3020	rmass.exe	20

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

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1204
- C:\Users\Admin\AppData\Local\Temp\4cbbbf59ae56255044c9235ad2bb35c0_exe32.exe
  "C:\Users\Admin\AppData\Local\Temp\4cbbbf59ae56255044c9235ad2bb35c0_exe32.exe"
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - Suspicious use of WriteProcessMemory
  PID:2656
- - C:\Windows\SysWOW64\rmass.exe
    "C:\Windows\SysWOW64\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
    - 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:3020
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:2516

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
20KB

MD5
da29c6cf57c12ee577b8ef8ee8b1d5ce

SHA1
de0ada543bcabba5a47b6615ef5138802d6e3b7a

SHA256
724fd379beef69cd33a71c235f60541230316b2e957c77459debf450e243241c

SHA512
abe228f12f6409fd9bb49ecd4be5b26ab546530293fe27ee173b10f3e0b24901ad42f79554be3ca1cde420a07aecbfe2d64916067a864dbdf7bbe5ac3f3f4c3b

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

Filesize
21KB

MD5
8b3e08359faa50ab05376469bc9ba3a2

SHA1
94b970f99613be3dfa1c9ee7dfccffd9ab9cd680

SHA256
970cd81b2b7b17e83ad07bedbf69c45b36cb38c37b6e0b484a11aebaf14b9092

SHA512
4a7bbfa21b07e5b294acc70b283f12f9ca308131f18cda0371398e2f973625cbc34667e3c8568e2fc64e8fe8d07ed36e7e29a154578df02bd590028a60631db6

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

Filesize
18KB

MD5
d50ffd558037d8da69b7e4cab9ef7b95

SHA1
8b449f0cc20f089c6fc0c16c3bb25ccfd029f16b

SHA256
32f909aa02b327b89a63708d6c2ec34ebe2d87dca2ed09ad13dbcf3ae2a6253f

SHA512
9b7ce580bd399b667efe106fc4032ac56cb7b03baaefc887914a2fa35f5ff091c7a7cafe1ab491773de0cd7eaf477b81bff172a8551796bd49be7d2294511802

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

Filesize
18KB

MD5
d50ffd558037d8da69b7e4cab9ef7b95

SHA1
8b449f0cc20f089c6fc0c16c3bb25ccfd029f16b

SHA256
32f909aa02b327b89a63708d6c2ec34ebe2d87dca2ed09ad13dbcf3ae2a6253f

SHA512
9b7ce580bd399b667efe106fc4032ac56cb7b03baaefc887914a2fa35f5ff091c7a7cafe1ab491773de0cd7eaf477b81bff172a8551796bd49be7d2294511802

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

Filesize
18KB

MD5
d50ffd558037d8da69b7e4cab9ef7b95

SHA1
8b449f0cc20f089c6fc0c16c3bb25ccfd029f16b

SHA256
32f909aa02b327b89a63708d6c2ec34ebe2d87dca2ed09ad13dbcf3ae2a6253f

SHA512
9b7ce580bd399b667efe106fc4032ac56cb7b03baaefc887914a2fa35f5ff091c7a7cafe1ab491773de0cd7eaf477b81bff172a8551796bd49be7d2294511802

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

Filesize
18KB

MD5
d50ffd558037d8da69b7e4cab9ef7b95

SHA1
8b449f0cc20f089c6fc0c16c3bb25ccfd029f16b

SHA256
32f909aa02b327b89a63708d6c2ec34ebe2d87dca2ed09ad13dbcf3ae2a6253f

SHA512
9b7ce580bd399b667efe106fc4032ac56cb7b03baaefc887914a2fa35f5ff091c7a7cafe1ab491773de0cd7eaf477b81bff172a8551796bd49be7d2294511802

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
18KB

MD5
d50ffd558037d8da69b7e4cab9ef7b95

SHA1
8b449f0cc20f089c6fc0c16c3bb25ccfd029f16b

SHA256
32f909aa02b327b89a63708d6c2ec34ebe2d87dca2ed09ad13dbcf3ae2a6253f

SHA512
9b7ce580bd399b667efe106fc4032ac56cb7b03baaefc887914a2fa35f5ff091c7a7cafe1ab491773de0cd7eaf477b81bff172a8551796bd49be7d2294511802

Download Submit
\Windows\SysWOW64\rmass.exe

Filesize
18KB

MD5
d50ffd558037d8da69b7e4cab9ef7b95

SHA1
8b449f0cc20f089c6fc0c16c3bb25ccfd029f16b

SHA256
32f909aa02b327b89a63708d6c2ec34ebe2d87dca2ed09ad13dbcf3ae2a6253f

SHA512
9b7ce580bd399b667efe106fc4032ac56cb7b03baaefc887914a2fa35f5ff091c7a7cafe1ab491773de0cd7eaf477b81bff172a8551796bd49be7d2294511802

Download Submit
memory/2516-43-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2656-8-0x0000000000400000-0x0000000000403000-memory.dmp

Filesize
12KB

Download
memory/2656-2-0x0000000000020000-0x0000000000031000-memory.dmp

Filesize
68KB

Download
memory/3020-10-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/3020-17-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download