61e0d38870771d0eb0a5429986380ce638281b12c73f0f93a49152a17444c00e

General

Target

61e0d38870771d0eb0a5429986380ce638281b12c73f0f93a49152a17444c00e.exe
Size

22KB
MD5

7f2f13f2926b81ecb05b3a95c08fb9f0
SHA1

1730660ac39fbbc2719518154d672fa33cfd51c7
SHA256

61e0d38870771d0eb0a5429986380ce638281b12c73f0f93a49152a17444c00e
SHA512

93e2d9c459598b7b4c40dcfb85dbb24ca359c19e482d505d2522c40366ed2d9892be920de08235aa1a07eb97af45df1e7487d4c53e99b7ebcfa64faf8c9b1480
SSDEEP

384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvX8Mb7a65:rRkiLw3HsDSARGG/MMb7r5

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\{4F424A49-5955-4945-4F42-4A4959554945}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4F424A49-5955-4945-4F42-4A4959554945}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4F424A49-5955-4945-4F42-4A4959554945}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{4F424A49-5955-4945-4F42-4A4959554945}\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\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
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe	rmass.exe

Executes dropped EXE 2 IoCs

pid	Process
4904	rmass.exe
4776	rmass.exe

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral2/memory/660-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/660-6-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/files/0x000700000002328e-5.dat	upx
behavioral2/memory/4904-8-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/4904-51-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/4776-52-0x0000000000400000-0x0000000000411000-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 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\rmass.exe	61e0d38870771d0eb0a5429986380ce638281b12c73f0f93a49152a17444c00e.exe
File opened for modification	C:\Windows\SysWOW64\ntdbg.exe	rmass.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\idbg32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	rmass.exe
File created	C:\Windows\SysWOW64\rmass.exe	61e0d38870771d0eb0a5429986380ce638281b12c73f0f93a49152a17444c00e.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\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
4904	rmass.exe
4904	rmass.exe
4904	rmass.exe
4904	rmass.exe
4904	rmass.exe
4904	rmass.exe
4776	rmass.exe
4776	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	660	61e0d38870771d0eb0a5429986380ce638281b12c73f0f93a49152a17444c00e.exe
Token: SeDebugPrivilege	4904	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 660 wrote to memory of 4904	660	61e0d38870771d0eb0a5429986380ce638281b12c73f0f93a49152a17444c00e.exe	83
PID 660 wrote to memory of 4904	660	61e0d38870771d0eb0a5429986380ce638281b12c73f0f93a49152a17444c00e.exe	83
PID 660 wrote to memory of 4904	660	61e0d38870771d0eb0a5429986380ce638281b12c73f0f93a49152a17444c00e.exe	83
PID 4904 wrote to memory of 628	4904	rmass.exe	5
PID 4904 wrote to memory of 3520	4904	rmass.exe	56
PID 4904 wrote to memory of 4776	4904	rmass.exe	84
PID 4904 wrote to memory of 4776	4904	rmass.exe	84
PID 4904 wrote to memory of 4776	4904	rmass.exe	84

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:628

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3520
- C:\Users\Admin\AppData\Local\Temp\61e0d38870771d0eb0a5429986380ce638281b12c73f0f93a49152a17444c00e.exe
  "C:\Users\Admin\AppData\Local\Temp\61e0d38870771d0eb0a5429986380ce638281b12c73f0f93a49152a17444c00e.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:660
- - 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:4904
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:4776

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

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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
24KB

MD5
40aed98e28841a5b2c36f3e781f5de2c

SHA1
f7f1096b31c26d3be86d426e123a2c95aa54401f

SHA256
cf440899f1d1a04c0076c85a37cdf7af10e2ffeb3abcd9d567c4f9639f90618d

SHA512
7eea131cce2d9ebf52055ce8896dfbdc631aa000a03f5ec948555a0d5255a8861620ca6678b7c5bf154240acd0e55f13f85bf93f8e85e49c9964bd674e1a756a

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

Filesize
25KB

MD5
af7a7f8c5b70fa73a2bc8119fe83d48f

SHA1
027e3960e5034dc91922780a50b181e1a585a12a

SHA256
23891a1b3faea534520e2393c2b5a0502167c39b923d42b6b6b852d85b2953ee

SHA512
7960a13a699038af517dcf4aa9abd1c44edc3450482c4bb04b3090ed0f2e28e679f0a8a1cb6eba481943eb4106c494bf84773524e7aca4a5f58aa5b0bbde6441

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

Filesize
22KB

MD5
7f2f13f2926b81ecb05b3a95c08fb9f0

SHA1
1730660ac39fbbc2719518154d672fa33cfd51c7

SHA256
61e0d38870771d0eb0a5429986380ce638281b12c73f0f93a49152a17444c00e

SHA512
93e2d9c459598b7b4c40dcfb85dbb24ca359c19e482d505d2522c40366ed2d9892be920de08235aa1a07eb97af45df1e7487d4c53e99b7ebcfa64faf8c9b1480

Download Submit
C:\Windows\System32\drivers\etc\hosts

Filesize
1KB

MD5
6f47b62de25d1745e296a06b3f98ed19

SHA1
a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f

SHA256
15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4

SHA512
dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7

Download Submit
memory/660-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/660-6-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4776-52-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4904-8-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4904-51-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads