f0650f2ea4b668eeadff0a96fb3405db7f8dc86d789e3d0b03b712d57210499b

General

Target

1df07d8debfe11b41ac10a1b634658f3_JC.exe
Size

18KB
MD5

1df07d8debfe11b41ac10a1b634658f3
SHA1

035adbbd92c68db4ba704f6b97b32f38e500b6a2
SHA256

f0650f2ea4b668eeadff0a96fb3405db7f8dc86d789e3d0b03b712d57210499b
SHA512

d7538e4e574c564c053e7a954d49ee55dfbe9ef482e73f0afde142c40fa482a5a8979127c03a7f6bc9c00bd3f8d3cf1c9cb6274de7a16877ef112c0c0ea0efcb
SSDEEP

384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvXk2t:rRkiLw3HsDSARGG/r

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\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
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusOverride = "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\{48465041-4a44-5056-4846-50414A445056}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{48465041-4a44-5056-4846-50414A445056}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{48465041-4a44-5056-4846-50414A445056}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{48465041-4a44-5056-4846-50414A445056}\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
1576	rmass.exe
4824	rmass.exe

UPX packed file 7 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4056-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/files/0x000800000002320a-5.dat	upx
behavioral2/files/0x000800000002320a-6.dat	upx
behavioral2/memory/4056-7-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/files/0x000800000002320a-9.dat	upx
behavioral2/memory/1576-41-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/4824-45-0x0000000000400000-0x0000000000411000-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
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\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	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	1df07d8debfe11b41ac10a1b634658f3_JC.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 created	C:\Windows\SysWOW64\rmass.exe	1df07d8debfe11b41ac10a1b634658f3_JC.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

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
1576	rmass.exe
1576	rmass.exe
1576	rmass.exe
1576	rmass.exe
1576	rmass.exe
1576	rmass.exe
4824	rmass.exe
4824	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4056	1df07d8debfe11b41ac10a1b634658f3_JC.exe
Token: SeDebugPrivilege	1576	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4056 wrote to memory of 1576	4056	1df07d8debfe11b41ac10a1b634658f3_JC.exe	83
PID 4056 wrote to memory of 1576	4056	1df07d8debfe11b41ac10a1b634658f3_JC.exe	83
PID 4056 wrote to memory of 1576	4056	1df07d8debfe11b41ac10a1b634658f3_JC.exe	83
PID 1576 wrote to memory of 4824	1576	rmass.exe	84
PID 1576 wrote to memory of 4824	1576	rmass.exe	84
PID 1576 wrote to memory of 4824	1576	rmass.exe	84
PID 1576 wrote to memory of 624	1576	rmass.exe	4
PID 1576 wrote to memory of 3188	1576	rmass.exe	55

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:624

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3188
- C:\Users\Admin\AppData\Local\Temp\1df07d8debfe11b41ac10a1b634658f3_JC.exe
  "C:\Users\Admin\AppData\Local\Temp\1df07d8debfe11b41ac10a1b634658f3_JC.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4056
- - 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:1576
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:4824

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
20KB

MD5
a11878196799843aaa8892274ed6215f

SHA1
7cc9b4750a133cc005c43415bfb99d6bab5bd62e

SHA256
49a315fee152565a569fa2e6f41357baf3b629ee8278e82894c6999e1bf406e8

SHA512
754774389205a23e15ca43da46e93bc115e84c2d3f64c089f59b48510aaaefb790924daed67427693758d6db9cbd18b11d8a9ad254df2f9a6e2650fe228d47e8

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

Filesize
21KB

MD5
4d202264c7cf494ca725b781b0dc1212

SHA1
8c1415f4c68b0ae28e323693e2f1bf6dbed6142b

SHA256
4176275cabe71c4b4e03c3f5dea7b2e58fd009598e27756e14943c6547444004

SHA512
f01aad6bd404511e62c4c7083687029cb2d1bd05465cf537080fe43f767edfa8369fe632268c0f2b8c1f87f110e7977c5b56848a162eb0fbe2658a90d74f8b5f

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

Filesize
18KB

MD5
1df07d8debfe11b41ac10a1b634658f3

SHA1
035adbbd92c68db4ba704f6b97b32f38e500b6a2

SHA256
f0650f2ea4b668eeadff0a96fb3405db7f8dc86d789e3d0b03b712d57210499b

SHA512
d7538e4e574c564c053e7a954d49ee55dfbe9ef482e73f0afde142c40fa482a5a8979127c03a7f6bc9c00bd3f8d3cf1c9cb6274de7a16877ef112c0c0ea0efcb

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

Filesize
18KB

MD5
1df07d8debfe11b41ac10a1b634658f3

SHA1
035adbbd92c68db4ba704f6b97b32f38e500b6a2

SHA256
f0650f2ea4b668eeadff0a96fb3405db7f8dc86d789e3d0b03b712d57210499b

SHA512
d7538e4e574c564c053e7a954d49ee55dfbe9ef482e73f0afde142c40fa482a5a8979127c03a7f6bc9c00bd3f8d3cf1c9cb6274de7a16877ef112c0c0ea0efcb

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

Filesize
18KB

MD5
1df07d8debfe11b41ac10a1b634658f3

SHA1
035adbbd92c68db4ba704f6b97b32f38e500b6a2

SHA256
f0650f2ea4b668eeadff0a96fb3405db7f8dc86d789e3d0b03b712d57210499b

SHA512
d7538e4e574c564c053e7a954d49ee55dfbe9ef482e73f0afde142c40fa482a5a8979127c03a7f6bc9c00bd3f8d3cf1c9cb6274de7a16877ef112c0c0ea0efcb

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

Filesize
1KB

MD5
6f47b62de25d1745e296a06b3f98ed19

SHA1
a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f

SHA256
15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4

SHA512
dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7

Download Submit
memory/1576-41-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4056-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4056-7-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4824-45-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads