aee83b2c9c5d725e0e617d3e3e6b357bebccacada5bbb9e6b7e4a779f48d93d1

Analysis

max time kernel
149s
max time network
143s
platform
windows7_x64
resource
win7-20231020-en
resource tags

arch:x64arch:x86image:win7-20231020-enlocale:en-usos:windows7-x64system
submitted
17-11-2023 15:48

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

NEAS.b7f6571e7840d038ee822063b3334b2d.exe
Size

19KB
MD5

b7f6571e7840d038ee822063b3334b2d
SHA1

17e18ca71ae6dbd765d71c6dd99a62cc19b556a1
SHA256

aee83b2c9c5d725e0e617d3e3e6b357bebccacada5bbb9e6b7e4a779f48d93d1
SHA512

1376c97c616b8d8b2fadb5f62a0acf421ce9f5fc30be25da2cc5f760d75fadb9a87af20697e03d7aef39c13b0bf51c2805ac3046f9e357bf2f4291f7bce4ba85
SSDEEP

384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvX+fad3S:rRkiLw3HsDSARGG/uR

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\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

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\{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
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

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
2144	rmass.exe
2272	rmass.exe

Loads dropped DLL 3 IoCs

pid	Process
1740	NEAS.b7f6571e7840d038ee822063b3334b2d.exe
1740	NEAS.b7f6571e7840d038ee822063b3334b2d.exe
2144	rmass.exe

UPX packed file 13 IoCs

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

upx

resource	yara_rule
behavioral1/files/0x0009000000012024-4.dat	upx
behavioral1/files/0x0009000000012024-24.dat	upx
behavioral1/memory/2272-26-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x0009000000012024-13.dat	upx
behavioral1/memory/2144-25-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/1740-12-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x0009000000012024-10.dat	upx
behavioral1/files/0x0009000000012024-19.dat	upx
behavioral1/files/0x0009000000012024-8.dat	upx
behavioral1/files/0x0009000000012024-7.dat	upx
behavioral1/memory/1740-5-0x0000000000320000-0x0000000000331000-memory.dmp	upx
behavioral1/memory/1740-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2144-60-0x0000000000400000-0x0000000000411000-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\ahuy.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\winrnt.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	NEAS.b7f6571e7840d038ee822063b3334b2d.exe
File created	C:\Windows\SysWOW64\rmass.exe	NEAS.b7f6571e7840d038ee822063b3334b2d.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\idbg32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.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\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
2144	rmass.exe
2144	rmass.exe
2144	rmass.exe
2272	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1740	NEAS.b7f6571e7840d038ee822063b3334b2d.exe
Token: SeDebugPrivilege	2144	rmass.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1740 wrote to memory of 2144	1740	NEAS.b7f6571e7840d038ee822063b3334b2d.exe	16
PID 1740 wrote to memory of 2144	1740	NEAS.b7f6571e7840d038ee822063b3334b2d.exe	16
PID 1740 wrote to memory of 2144	1740	NEAS.b7f6571e7840d038ee822063b3334b2d.exe	16
PID 1740 wrote to memory of 2144	1740	NEAS.b7f6571e7840d038ee822063b3334b2d.exe	16
PID 2144 wrote to memory of 420	2144	rmass.exe	3
PID 2144 wrote to memory of 1264	2144	rmass.exe	9
PID 2144 wrote to memory of 2272	2144	rmass.exe	15
PID 2144 wrote to memory of 2272	2144	rmass.exe	15
PID 2144 wrote to memory of 2272	2144	rmass.exe	15
PID 2144 wrote to memory of 2272	2144	rmass.exe	15

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

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1264
- C:\Users\Admin\AppData\Local\Temp\NEAS.b7f6571e7840d038ee822063b3334b2d.exe
  "C:\Users\Admin\AppData\Local\Temp\NEAS.b7f6571e7840d038ee822063b3334b2d.exe"
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1740
- - 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:2144

C:\Windows\SysWOW64\rmass.exe
--k33p
1⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:2272

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

Loading Replay Monitor...

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
b5fb40d90424e55657ce7fb26d951446

SHA1
9e56b304a67512e08c22e372a81ca1746af1c175

SHA256
d49db1d9f67ddd647a0ea225f2d4a0b1499996d97ca85d09bc7a56f831927bf7

SHA512
f46add09af6320bc6f63172157b57c396f4462394034c49a25aa9ee4d4ea8dc020469babd952a40f23656bb5d4895f4304c3ab97670c829d1e5b9a90bb16d0a0

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

Filesize
22KB

MD5
c37676cdb93ba9141ef648974df6ae70

SHA1
48261f2ec42894be53424319101a386b7cf569df

SHA256
d556d53f283fc41a82c7ab21b370812b31c69005de71b9d9dfa70c02a69e2249

SHA512
4bd80b176d0e0b5d328e6170a5edf5da205da7aa16077558d769bb586cc574750d82bf2dee8bf720bb1b760375cdfd54920d247345360003f675d1b3471d0c99

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

Filesize
19KB

MD5
b7f6571e7840d038ee822063b3334b2d

SHA1
17e18ca71ae6dbd765d71c6dd99a62cc19b556a1

SHA256
aee83b2c9c5d725e0e617d3e3e6b357bebccacada5bbb9e6b7e4a779f48d93d1

SHA512
1376c97c616b8d8b2fadb5f62a0acf421ce9f5fc30be25da2cc5f760d75fadb9a87af20697e03d7aef39c13b0bf51c2805ac3046f9e357bf2f4291f7bce4ba85

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

Filesize
19KB

MD5
b7f6571e7840d038ee822063b3334b2d

SHA1
17e18ca71ae6dbd765d71c6dd99a62cc19b556a1

SHA256
aee83b2c9c5d725e0e617d3e3e6b357bebccacada5bbb9e6b7e4a779f48d93d1

SHA512
1376c97c616b8d8b2fadb5f62a0acf421ce9f5fc30be25da2cc5f760d75fadb9a87af20697e03d7aef39c13b0bf51c2805ac3046f9e357bf2f4291f7bce4ba85

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

Filesize
19KB

MD5
b7f6571e7840d038ee822063b3334b2d

SHA1
17e18ca71ae6dbd765d71c6dd99a62cc19b556a1

SHA256
aee83b2c9c5d725e0e617d3e3e6b357bebccacada5bbb9e6b7e4a779f48d93d1

SHA512
1376c97c616b8d8b2fadb5f62a0acf421ce9f5fc30be25da2cc5f760d75fadb9a87af20697e03d7aef39c13b0bf51c2805ac3046f9e357bf2f4291f7bce4ba85

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

Filesize
19KB

MD5
b7f6571e7840d038ee822063b3334b2d

SHA1
17e18ca71ae6dbd765d71c6dd99a62cc19b556a1

SHA256
aee83b2c9c5d725e0e617d3e3e6b357bebccacada5bbb9e6b7e4a779f48d93d1

SHA512
1376c97c616b8d8b2fadb5f62a0acf421ce9f5fc30be25da2cc5f760d75fadb9a87af20697e03d7aef39c13b0bf51c2805ac3046f9e357bf2f4291f7bce4ba85

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
b7f6571e7840d038ee822063b3334b2d

SHA1
17e18ca71ae6dbd765d71c6dd99a62cc19b556a1

SHA256
aee83b2c9c5d725e0e617d3e3e6b357bebccacada5bbb9e6b7e4a779f48d93d1

SHA512
1376c97c616b8d8b2fadb5f62a0acf421ce9f5fc30be25da2cc5f760d75fadb9a87af20697e03d7aef39c13b0bf51c2805ac3046f9e357bf2f4291f7bce4ba85

Download Submit
\Windows\SysWOW64\rmass.exe

Filesize
19KB

MD5
b7f6571e7840d038ee822063b3334b2d

SHA1
17e18ca71ae6dbd765d71c6dd99a62cc19b556a1

SHA256
aee83b2c9c5d725e0e617d3e3e6b357bebccacada5bbb9e6b7e4a779f48d93d1

SHA512
1376c97c616b8d8b2fadb5f62a0acf421ce9f5fc30be25da2cc5f760d75fadb9a87af20697e03d7aef39c13b0bf51c2805ac3046f9e357bf2f4291f7bce4ba85

Download Submit
\Windows\SysWOW64\rmass.exe

Filesize
19KB

MD5
b7f6571e7840d038ee822063b3334b2d

SHA1
17e18ca71ae6dbd765d71c6dd99a62cc19b556a1

SHA256
aee83b2c9c5d725e0e617d3e3e6b357bebccacada5bbb9e6b7e4a779f48d93d1

SHA512
1376c97c616b8d8b2fadb5f62a0acf421ce9f5fc30be25da2cc5f760d75fadb9a87af20697e03d7aef39c13b0bf51c2805ac3046f9e357bf2f4291f7bce4ba85

Download Submit
memory/1740-5-0x0000000000320000-0x0000000000331000-memory.dmp

Filesize
68KB

Download
memory/1740-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1740-12-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1740-18-0x0000000000320000-0x0000000000331000-memory.dmp

Filesize
68KB

Download
memory/1740-91-0x0000000000320000-0x0000000000331000-memory.dmp

Filesize
68KB

Download
memory/2144-25-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2144-60-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2272-26-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download