89695d51a13cc80db8e4c6bda06ca1f1bdd88b66efa71cfb205e56fde060ea30

Analysis

max time kernel
150s
max time network
124s
platform
windows7_x64
resource
win7-20230831-en
resource tags

arch:x64arch:x86image:win7-20230831-enlocale:en-usos:windows7-x64system
submitted
08-10-2023 14:34

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General

Target

NEAS.82711947ab8024a670455e7aeb961791_JC.exe
Size

19KB
MD5

82711947ab8024a670455e7aeb961791
SHA1

c1a16d279326a8192d40b50a6348df67d27b82d5
SHA256

89695d51a13cc80db8e4c6bda06ca1f1bdd88b66efa71cfb205e56fde060ea30
SHA512

e4700ef1037679e6edab801f6633833a35a740643a35cb659ed0bab2c8dbbd65d6e15a65886995dbb5a9c0ee5c208d5ef1b23db2a54e514f9e348fad030e8872
SSDEEP

384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvXwW:rRkiLw3HsDSARGG/d

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\{5555564F-484b-4e4c-5555-564F484B4e4c}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{5555564F-484b-4e4c-5555-564F484B4e4c}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{5555564F-484b-4e4c-5555-564F484B4e4c}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{5555564F-484b-4e4c-5555-564F484B4e4c}\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
1280	rmass.exe
3052	rmass.exe

Loads dropped DLL 3 IoCs

pid	Process
1292	NEAS.82711947ab8024a670455e7aeb961791_JC.exe
1292	NEAS.82711947ab8024a670455e7aeb961791_JC.exe
1280	rmass.exe

UPX packed file 11 IoCs

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

upx

resource	yara_rule
behavioral1/memory/1292-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x00060000000120e4-4.dat	upx
behavioral1/files/0x00060000000120e4-7.dat	upx
behavioral1/files/0x00060000000120e4-6.dat	upx
behavioral1/memory/1292-10-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x00060000000120e4-13.dat	upx
behavioral1/files/0x00060000000120e4-12.dat	upx
behavioral1/files/0x00060000000120e4-23.dat	upx
behavioral1/files/0x00060000000120e4-22.dat	upx
behavioral1/memory/3052-25-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/1280-26-0x0000000000400000-0x0000000000411000-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\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

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.82711947ab8024a670455e7aeb961791_JC.exe
File opened for modification	C:\Windows\SysWOW64\ntdbg.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\aset32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\idbg32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	NEAS.82711947ab8024a670455e7aeb961791_JC.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\ahuy.exe	rmass.exe
File created	C:\Windows\SysWOW64\ahuy.exe	rmass.exe
File created	C:\Windows\SysWOW64\ntdbg.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
1280	rmass.exe
1280	rmass.exe
1280	rmass.exe
3052	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1292	NEAS.82711947ab8024a670455e7aeb961791_JC.exe
Token: SeDebugPrivilege	1280	rmass.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1292 wrote to memory of 1280	1292	NEAS.82711947ab8024a670455e7aeb961791_JC.exe	28
PID 1292 wrote to memory of 1280	1292	NEAS.82711947ab8024a670455e7aeb961791_JC.exe	28
PID 1292 wrote to memory of 1280	1292	NEAS.82711947ab8024a670455e7aeb961791_JC.exe	28
PID 1292 wrote to memory of 1280	1292	NEAS.82711947ab8024a670455e7aeb961791_JC.exe	28
PID 1280 wrote to memory of 424	1280	rmass.exe	3
PID 1280 wrote to memory of 1208	1280	rmass.exe	15
PID 1280 wrote to memory of 3052	1280	rmass.exe	29
PID 1280 wrote to memory of 3052	1280	rmass.exe	29
PID 1280 wrote to memory of 3052	1280	rmass.exe	29
PID 1280 wrote to memory of 3052	1280	rmass.exe	29

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

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1208
- C:\Users\Admin\AppData\Local\Temp\NEAS.82711947ab8024a670455e7aeb961791_JC.exe
  "C:\Users\Admin\AppData\Local\Temp\NEAS.82711947ab8024a670455e7aeb961791_JC.exe"
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1292
- - 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:1280
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:3052

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
266e657441a1e2d820f1346518299adb

SHA1
c65807dd6f2c0f9f7c5dbcab11bc65e214de937d

SHA256
5a62c8be76d940f77c60e4babb800d17c78d319dd58161453656e20b20a90424

SHA512
444b0ff0eedd65502dceab6f52dfc30257476ef0055d46c4c920f293980149cb75b1148aa298540c794712fa4eb6226c1d54ff3c53f7fef773061c6634d4b121

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

Filesize
22KB

MD5
8471cbe21a7ee09d72828ed0c2ac50c0

SHA1
fe51b4351ee439661cb534a3ae86d9c74f8f29e0

SHA256
22561125071e9985af7d8b2df5161c7d1dbb8529eed652731fadf718ece65df2

SHA512
dabd83bd760c8a1f55fc53aa3dde6524f9fed6d48265df59c8a1b88997d24a5979e9fa6a3914574057f961b7b886cdba6e84c96596e39a0c924969d0cfc2bb42

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

Filesize
19KB

MD5
82711947ab8024a670455e7aeb961791

SHA1
c1a16d279326a8192d40b50a6348df67d27b82d5

SHA256
89695d51a13cc80db8e4c6bda06ca1f1bdd88b66efa71cfb205e56fde060ea30

SHA512
e4700ef1037679e6edab801f6633833a35a740643a35cb659ed0bab2c8dbbd65d6e15a65886995dbb5a9c0ee5c208d5ef1b23db2a54e514f9e348fad030e8872

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

Filesize
19KB

MD5
82711947ab8024a670455e7aeb961791

SHA1
c1a16d279326a8192d40b50a6348df67d27b82d5

SHA256
89695d51a13cc80db8e4c6bda06ca1f1bdd88b66efa71cfb205e56fde060ea30

SHA512
e4700ef1037679e6edab801f6633833a35a740643a35cb659ed0bab2c8dbbd65d6e15a65886995dbb5a9c0ee5c208d5ef1b23db2a54e514f9e348fad030e8872

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

Filesize
19KB

MD5
82711947ab8024a670455e7aeb961791

SHA1
c1a16d279326a8192d40b50a6348df67d27b82d5

SHA256
89695d51a13cc80db8e4c6bda06ca1f1bdd88b66efa71cfb205e56fde060ea30

SHA512
e4700ef1037679e6edab801f6633833a35a740643a35cb659ed0bab2c8dbbd65d6e15a65886995dbb5a9c0ee5c208d5ef1b23db2a54e514f9e348fad030e8872

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

Filesize
19KB

MD5
82711947ab8024a670455e7aeb961791

SHA1
c1a16d279326a8192d40b50a6348df67d27b82d5

SHA256
89695d51a13cc80db8e4c6bda06ca1f1bdd88b66efa71cfb205e56fde060ea30

SHA512
e4700ef1037679e6edab801f6633833a35a740643a35cb659ed0bab2c8dbbd65d6e15a65886995dbb5a9c0ee5c208d5ef1b23db2a54e514f9e348fad030e8872

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
82711947ab8024a670455e7aeb961791

SHA1
c1a16d279326a8192d40b50a6348df67d27b82d5

SHA256
89695d51a13cc80db8e4c6bda06ca1f1bdd88b66efa71cfb205e56fde060ea30

SHA512
e4700ef1037679e6edab801f6633833a35a740643a35cb659ed0bab2c8dbbd65d6e15a65886995dbb5a9c0ee5c208d5ef1b23db2a54e514f9e348fad030e8872

Download Submit
\Windows\SysWOW64\rmass.exe

Filesize
19KB

MD5
82711947ab8024a670455e7aeb961791

SHA1
c1a16d279326a8192d40b50a6348df67d27b82d5

SHA256
89695d51a13cc80db8e4c6bda06ca1f1bdd88b66efa71cfb205e56fde060ea30

SHA512
e4700ef1037679e6edab801f6633833a35a740643a35cb659ed0bab2c8dbbd65d6e15a65886995dbb5a9c0ee5c208d5ef1b23db2a54e514f9e348fad030e8872

Download Submit
\Windows\SysWOW64\rmass.exe

Filesize
19KB

MD5
82711947ab8024a670455e7aeb961791

SHA1
c1a16d279326a8192d40b50a6348df67d27b82d5

SHA256
89695d51a13cc80db8e4c6bda06ca1f1bdd88b66efa71cfb205e56fde060ea30

SHA512
e4700ef1037679e6edab801f6633833a35a740643a35cb659ed0bab2c8dbbd65d6e15a65886995dbb5a9c0ee5c208d5ef1b23db2a54e514f9e348fad030e8872

Download Submit
memory/1280-26-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1280-24-0x00000000003A0000-0x00000000003B1000-memory.dmp

Filesize
68KB

Download
memory/1280-60-0x00000000003A0000-0x00000000003B1000-memory.dmp

Filesize
68KB

Download
memory/1292-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1292-11-0x00000000002C0000-0x00000000002D1000-memory.dmp

Filesize
68KB

Download
memory/1292-51-0x00000000002C0000-0x00000000002D1000-memory.dmp

Filesize
68KB

Download
memory/1292-10-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/3052-25-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download