aee83b2c9c5d725e0e617d3e3e6b357bebccacada5bbb9e6b7e4a779f48d93d1

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\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
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{51494146-4147-584b-5149-41464147584b}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{51494146-4147-584b-5149-41464147584b}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	rmass.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{51494146-4147-584b-5149-41464147584b}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{51494146-4147-584b-5149-41464147584b}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	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
2952	rmass.exe
3552	rmass.exe

UPX packed file 7 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4036-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/files/0x000500000001e9bf-5.dat	upx
behavioral2/files/0x000500000001e9bf-7.dat	upx
behavioral2/memory/4036-6-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/files/0x000500000001e9bf-10.dat	upx
behavioral2/memory/2952-77-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/3552-87-0x0000000000400000-0x0000000000411000-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
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
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

Drops file in System32 directory 12 IoCs

description	ioc	Process
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 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\idbg32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	NEAS.b7f6571e7840d038ee822063b3334b2d.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\aset32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.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 8 IoCs

pid	Process
2952	rmass.exe
2952	rmass.exe
2952	rmass.exe
2952	rmass.exe
3552	rmass.exe
3552	rmass.exe
2952	rmass.exe
2952	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4036	NEAS.b7f6571e7840d038ee822063b3334b2d.exe
Token: SeDebugPrivilege	2952	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4036 wrote to memory of 2952	4036	NEAS.b7f6571e7840d038ee822063b3334b2d.exe	86
PID 4036 wrote to memory of 2952	4036	NEAS.b7f6571e7840d038ee822063b3334b2d.exe	86
PID 4036 wrote to memory of 2952	4036	NEAS.b7f6571e7840d038ee822063b3334b2d.exe	86
PID 2952 wrote to memory of 3552	2952	rmass.exe	87
PID 2952 wrote to memory of 3552	2952	rmass.exe	87
PID 2952 wrote to memory of 3552	2952	rmass.exe	87
PID 2952 wrote to memory of 588	2952	rmass.exe	4
PID 2952 wrote to memory of 3096	2952	rmass.exe	47

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:588

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3096
- C:\Users\Admin\AppData\Local\Temp\NEAS.b7f6571e7840d038ee822063b3334b2d.exe
  "C:\Users\Admin\AppData\Local\Temp\NEAS.b7f6571e7840d038ee822063b3334b2d.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4036
- - 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
    - 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:2952
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:3552

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

3

T1547

Registry Run Keys / Startup Folder

2

T1547.001

Winlogon Helper DLL

1

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

3

T1547

Registry Run Keys / Startup Folder

2

T1547.001

Winlogon Helper DLL

1

T1547.004

Defense Evasion

Impair Defenses

2

T1562

Disable or Modify Tools

Modify Registry

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
017833bc663b227bfacf5abf1bd143b2

SHA1
68b8bf6a8e3ff668264800dcc30d752ebe89104b

SHA256
0e8eee87e169fdea0a632d41c074e7d731fcb8b79f6d61f5c45c5d05c9790a9c

SHA512
a52c6fe176216e503482af10af57eadc52d3e060875b781a9c817e83fe0675b147f693eb1be6941e30b152a820c568e02b7de8b66842e398744b9ca319330643

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

Filesize
22KB

MD5
8e7bde643a9ee642ff2873329ad83162

SHA1
7d791e98a4d1013d013cf547447f6f9f01d8e2c3

SHA256
f0f2bafd1810696eeee3d328eceb1e0d9c81af283094593dcc433e66b3febee5

SHA512
9663a604655b115fca1194de5c673453e9774ea7d57b75c79f6f6b04a5d2bea035bbc3b4842669f577424d64d8f43d1b8c232fb5601c0d1e4177159cf484d5ef

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
6f47b62de25d1745e296a06b3f98ed19

SHA1
a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f

SHA256
15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4

SHA512
dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7

Download Submit
memory/2952-77-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/3552-87-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4036-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4036-6-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads