fffb9dc8e71747e3a5a00b2e60280f4e3c794d5ef3b2e2e688427252c051acba

General

Target

fffb9dc8e71747e3a5a00b2e60280f4e3c794d5ef3b2e2e688427252c051acba.exe
Size

21KB
MD5

722848a2b4c30642aa3db387a4408738
SHA1

ba5044185edb021cf17a42446bb9558e55a230a9
SHA256

fffb9dc8e71747e3a5a00b2e60280f4e3c794d5ef3b2e2e688427252c051acba
SHA512

16cdc599fe99a12420b275743968c6d9f31b64a91fa81665381dd4b8e85270fdf6e0bf648625f49e800030866aae4d3b29212082aed5284d34d6ba56a073dc5f
SSDEEP

384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvX8Mb7a6cUJ:rRkiLw3HsDSARGG/MMb7rz

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\{44544B55-544a-524c-4454-4B55544A524c}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{44544B55-544a-524c-4454-4B55544A524c}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{44544B55-544a-524c-4454-4B55544A524c}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{44544B55-544a-524c-4454-4B55544A524c}\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
544	rmass.exe
2788	rmass.exe

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1568-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/files/0x000300000001e9b1-5.dat	upx
behavioral2/memory/1568-6-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/2788-17-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/544-78-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/2788-88-0x0000000000400000-0x0000000000411000-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}\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
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

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\rmass.exe	rmass.exe
File created	C:\Windows\SysWOW64\rmass.exe	fffb9dc8e71747e3a5a00b2e60280f4e3c794d5ef3b2e2e688427252c051acba.exe
File opened for modification	C:\Windows\SysWOW64\ntdbg.exe	rmass.exe
File opened for modification	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\rmass.exe	fffb9dc8e71747e3a5a00b2e60280f4e3c794d5ef3b2e2e688427252c051acba.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\idbg32.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
544	rmass.exe
544	rmass.exe
544	rmass.exe
544	rmass.exe
544	rmass.exe
544	rmass.exe
2788	rmass.exe
2788	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1568	fffb9dc8e71747e3a5a00b2e60280f4e3c794d5ef3b2e2e688427252c051acba.exe
Token: SeDebugPrivilege	544	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1568 wrote to memory of 544	1568	fffb9dc8e71747e3a5a00b2e60280f4e3c794d5ef3b2e2e688427252c051acba.exe	87
PID 1568 wrote to memory of 544	1568	fffb9dc8e71747e3a5a00b2e60280f4e3c794d5ef3b2e2e688427252c051acba.exe	87
PID 1568 wrote to memory of 544	1568	fffb9dc8e71747e3a5a00b2e60280f4e3c794d5ef3b2e2e688427252c051acba.exe	87
PID 544 wrote to memory of 624	544	rmass.exe	5
PID 544 wrote to memory of 3496	544	rmass.exe	56
PID 544 wrote to memory of 2788	544	rmass.exe	88
PID 544 wrote to memory of 2788	544	rmass.exe	88
PID 544 wrote to memory of 2788	544	rmass.exe	88

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

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3496
- C:\Users\Admin\AppData\Local\Temp\fffb9dc8e71747e3a5a00b2e60280f4e3c794d5ef3b2e2e688427252c051acba.exe
  "C:\Users\Admin\AppData\Local\Temp\fffb9dc8e71747e3a5a00b2e60280f4e3c794d5ef3b2e2e688427252c051acba.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1568
- - 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:544
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:2788

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

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
23KB

MD5
5a4c87cec27720a1f5b7520496a0ce33

SHA1
12786de30c787f672c39c54a0b33a5cb69475807

SHA256
0f8ad553502b62924a2e24130b9c87cde1ff44e76cae75f2c1101b9181895a9b

SHA512
3230344b24ae20529fb32ae0bb2a96b0527a02065273dee86ff7becc428e2387d5f35dd1191f208e5eb19e5ba69e380648608b3c05e213ce7a933caac1624b91

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

Filesize
24KB

MD5
9c438def84886a3c2ee3d8b7f051e068

SHA1
83146b609077ecc4bcd8057adf225198e3223aa5

SHA256
9ce1c446a39c612194a2486ce8ead06d5e54d5f3ce88f300e9274d25d7a8af7e

SHA512
e91017936c10c3388fe6c3c33738c8771d28acf40472556c9494a70306ecbc80fab13e53e5e2925888237394ac72717bf6411e0899d9fe979c4c962e82b6cd6b

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

Filesize
21KB

MD5
722848a2b4c30642aa3db387a4408738

SHA1
ba5044185edb021cf17a42446bb9558e55a230a9

SHA256
fffb9dc8e71747e3a5a00b2e60280f4e3c794d5ef3b2e2e688427252c051acba

SHA512
16cdc599fe99a12420b275743968c6d9f31b64a91fa81665381dd4b8e85270fdf6e0bf648625f49e800030866aae4d3b29212082aed5284d34d6ba56a073dc5f

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

Filesize
1KB

MD5
6f47b62de25d1745e296a06b3f98ed19

SHA1
a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f

SHA256
15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4

SHA512
dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7

Download Submit
memory/544-78-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1568-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1568-6-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2788-17-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2788-88-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads