f827d29458ece0dafd14a22a3695ec26858448db44bd6c04fdd9095bbbd04b86

General

Target

f827d29458ece0dafd14a22a3695ec26858448db44bd6c04fdd9095bbbd04b86.exe
Size

63KB
MD5

dbaec362e515a3d028d19630fb5d5d85
SHA1

7c737c663990d86d626c6d278fbf57ba9eaa233d
SHA256

f827d29458ece0dafd14a22a3695ec26858448db44bd6c04fdd9095bbbd04b86
SHA512

40c2b4c4c897fc133545056de1cb13ff143822725a6592a8c28fdfd5471f1bc18806b4ad39fcc9523202b4ef8e2a17f05c7c975a35f4b8b3b4050bc8210cb818
SSDEEP

768:rAUJmQCcmLCXQq6fsKiJYsIkjJVzqsVG5kuGKQLddOW/O4Wv904s:sUNHFKQbIkHvGMdOh4004s

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
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4D47494C-4a55-4252-4D47-494C4A554252}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	rmass.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4D47494C-4a55-4252-4D47-494C4A554252}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4D47494C-4a55-4252-4D47-494C4A554252}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4D47494C-4a55-4252-4D47-494C4A554252}\IsInstalled = "1"	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
2164	rmass.exe
2528	rmass.exe

Loads dropped DLL 3 IoCs

pid	Process
2720	f827d29458ece0dafd14a22a3695ec26858448db44bd6c04fdd9095bbbd04b86.exe
2720	f827d29458ece0dafd14a22a3695ec26858448db44bd6c04fdd9095bbbd04b86.exe
2164	rmass.exe

UPX packed file 8 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2720-0-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral1/memory/2720-5-0x00000000003B0000-0x00000000003C2000-memory.dmp	upx
behavioral1/files/0x0009000000012246-4.dat	upx
behavioral1/memory/2164-23-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral1/memory/2720-11-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral1/memory/2164-25-0x00000000003A0000-0x00000000003B2000-memory.dmp	upx
behavioral1/memory/2528-26-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral1/memory/2164-87-0x0000000000400000-0x0000000000412000-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}\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
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\{BC84DF00-BC38-9902-8082-6FCBF2D87A0B}\012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345 = "a"	rmass.exe

Drops file in System32 directory 12 IoCs

description	ioc	Process
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 created	C:\Windows\SysWOW64\rmass.exe	f827d29458ece0dafd14a22a3695ec26858448db44bd6c04fdd9095bbbd04b86.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\RECOVER32.DLL	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	f827d29458ece0dafd14a22a3695ec26858448db44bd6c04fdd9095bbbd04b86.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\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\idbg32.exe	rmass.exe
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

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2164	rmass.exe
2164	rmass.exe
2164	rmass.exe
2528	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2720	f827d29458ece0dafd14a22a3695ec26858448db44bd6c04fdd9095bbbd04b86.exe
Token: SeDebugPrivilege	2164	rmass.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2720 wrote to memory of 2164	2720	f827d29458ece0dafd14a22a3695ec26858448db44bd6c04fdd9095bbbd04b86.exe	28
PID 2720 wrote to memory of 2164	2720	f827d29458ece0dafd14a22a3695ec26858448db44bd6c04fdd9095bbbd04b86.exe	28
PID 2720 wrote to memory of 2164	2720	f827d29458ece0dafd14a22a3695ec26858448db44bd6c04fdd9095bbbd04b86.exe	28
PID 2720 wrote to memory of 2164	2720	f827d29458ece0dafd14a22a3695ec26858448db44bd6c04fdd9095bbbd04b86.exe	28
PID 2164 wrote to memory of 420	2164	rmass.exe	5
PID 2164 wrote to memory of 1456	2164	rmass.exe	21
PID 2164 wrote to memory of 2528	2164	rmass.exe	29
PID 2164 wrote to memory of 2528	2164	rmass.exe	29
PID 2164 wrote to memory of 2528	2164	rmass.exe	29
PID 2164 wrote to memory of 2528	2164	rmass.exe	29

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

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1456
- C:\Users\Admin\AppData\Local\Temp\f827d29458ece0dafd14a22a3695ec26858448db44bd6c04fdd9095bbbd04b86.exe
  "C:\Users\Admin\AppData\Local\Temp\f827d29458ece0dafd14a22a3695ec26858448db44bd6c04fdd9095bbbd04b86.exe"
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2720
- - 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:2164
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:2528

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
65KB

MD5
6e012ba47a215621924ba57be6efd520

SHA1
25088a964024f5e33f47f6f24c867ca6f2158b65

SHA256
f388f25c576bb63d5413b4f8ca823f3a466ba49249dbf4395f18216e14d14344

SHA512
3e6c02c1893e61b533a34d5d24792691d726e7fc106252624df23cf19f31f9feb6fbcfdce899170e165e2888cd7c3e19cab9f302e0bba07b5f8b090b5aa42f47

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

Filesize
66KB

MD5
3406448900f372b3e7606b51e593aeb5

SHA1
00a34b147839808d7c7642e9cf0f52bf00442c80

SHA256
f6993b697f2a8db36cf40c8c62fc8526ee0996713b32ba05e3f9483c4cf9cace

SHA512
b33bd02eaccdc31880f1504a135a804e2a98488225415a31334ffe3f453d9fc24fb2a28840ac3cc1fbf3694a190c353b1010d0d343a5da5c651c71be9a4278b4

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
63KB

MD5
dbaec362e515a3d028d19630fb5d5d85

SHA1
7c737c663990d86d626c6d278fbf57ba9eaa233d

SHA256
f827d29458ece0dafd14a22a3695ec26858448db44bd6c04fdd9095bbbd04b86

SHA512
40c2b4c4c897fc133545056de1cb13ff143822725a6592a8c28fdfd5471f1bc18806b4ad39fcc9523202b4ef8e2a17f05c7c975a35f4b8b3b4050bc8210cb818

Download Submit
memory/2164-23-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2164-25-0x00000000003A0000-0x00000000003B2000-memory.dmp

Filesize
72KB

Download
memory/2164-87-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2164-88-0x00000000003A0000-0x00000000003B2000-memory.dmp

Filesize
72KB

Download
memory/2528-26-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2720-11-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2720-0-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/2720-5-0x00000000003B0000-0x00000000003C2000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads