a7b7d2b07ea36e5e7046e604114196f19b3b2f9890727bfe9f35fd52d0b6cc9c

General

Target

a7b7d2b07ea36e5e7046e604114196f19b3b2f9890727bfe9f35fd52d0b6cc9c.exe
Size

66KB
MD5

cd99b27236dc34aa2e7e351ce1985e6d
SHA1

1e598cc44540a92531f417cf71d2649832f3edb8
SHA256

a7b7d2b07ea36e5e7046e604114196f19b3b2f9890727bfe9f35fd52d0b6cc9c
SHA512

ff7fd7b891a40c54aba760c23263b54bac0c7a084020bf2f93171b5adb94473c76d2e44035006417693e12ba1e174c8afc32466e0cd1797e8c946d47f88347e8
SSDEEP

768:jIUihihFX+6TPPngdXnYSizpNyjdrJcGbYyQfbHEmn5fE9Z8Slv2a5YgVu6md0DU:jQ9YSiKBJcGVGh6Z8avpMH

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\{4748505A-5247-4643-4748-505A52474643}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4748505A-5247-4643-4748-505A52474643}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4748505A-5247-4643-4748-505A52474643}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4748505A-5247-4643-4748-505A52474643}\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
1840	rmass.exe
2984	rmass.exe

Loads dropped DLL 3 IoCs

pid	Process
1844	a7b7d2b07ea36e5e7046e604114196f19b3b2f9890727bfe9f35fd52d0b6cc9c.exe
1844	a7b7d2b07ea36e5e7046e604114196f19b3b2f9890727bfe9f35fd52d0b6cc9c.exe
1840	rmass.exe

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral1/files/0x000c00000001480e-1.dat	upx
behavioral1/memory/1844-2-0x0000000000020000-0x0000000000032000-memory.dmp	upx
behavioral1/memory/1840-10-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral1/memory/1840-21-0x00000000002F0000-0x0000000000302000-memory.dmp	upx
behavioral1/memory/2984-23-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral1/memory/1840-78-0x0000000000400000-0x0000000000412000-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
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\ntdbg.exe	rmass.exe
File created	C:\Windows\SysWOW64\rmass.exe	a7b7d2b07ea36e5e7046e604114196f19b3b2f9890727bfe9f35fd52d0b6cc9c.exe
File created	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\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	a7b7d2b07ea36e5e7046e604114196f19b3b2f9890727bfe9f35fd52d0b6cc9c.exe
File opened for modification	C:\Windows\SysWOW64\rmass.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 4 IoCs

pid	Process
1840	rmass.exe
1840	rmass.exe
1840	rmass.exe
2984	rmass.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1840	rmass.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1844 wrote to memory of 1840	1844	a7b7d2b07ea36e5e7046e604114196f19b3b2f9890727bfe9f35fd52d0b6cc9c.exe	28
PID 1844 wrote to memory of 1840	1844	a7b7d2b07ea36e5e7046e604114196f19b3b2f9890727bfe9f35fd52d0b6cc9c.exe	28
PID 1844 wrote to memory of 1840	1844	a7b7d2b07ea36e5e7046e604114196f19b3b2f9890727bfe9f35fd52d0b6cc9c.exe	28
PID 1844 wrote to memory of 1840	1844	a7b7d2b07ea36e5e7046e604114196f19b3b2f9890727bfe9f35fd52d0b6cc9c.exe	28
PID 1840 wrote to memory of 436	1840	rmass.exe	5
PID 1840 wrote to memory of 1104	1840	rmass.exe	20
PID 1840 wrote to memory of 2984	1840	rmass.exe	29
PID 1840 wrote to memory of 2984	1840	rmass.exe	29
PID 1840 wrote to memory of 2984	1840	rmass.exe	29
PID 1840 wrote to memory of 2984	1840	rmass.exe	29

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:436

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1104
- C:\Users\Admin\AppData\Local\Temp\a7b7d2b07ea36e5e7046e604114196f19b3b2f9890727bfe9f35fd52d0b6cc9c.exe
  "C:\Users\Admin\AppData\Local\Temp\a7b7d2b07ea36e5e7046e604114196f19b3b2f9890727bfe9f35fd52d0b6cc9c.exe"
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - Suspicious use of WriteProcessMemory
  PID:1844
- - C:\Windows\SysWOW64\rmass.exe
    "C:\Windows\SysWOW64\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:1840
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:2984

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
66KB

MD5
698a053f8f7610f5f0a88b5cdcfe7a86

SHA1
3516e2eb3d13a687d5d44ae6b7c3d098432781e1

SHA256
6f88baff279a3e0438dbd60958d32f7ed072f7e4b3e502de14cab2140001b1dd

SHA512
a3591dc8a16288be867ab0de70d8aba81df5a44ab247f3a11ef67aa453625470d65acf5ff85384b904a8832d7993efbf4af6cd0d8551d96f56e37715fc23c07a

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

Filesize
67KB

MD5
e2260b7347cb9cb10d3b982f2955f4ce

SHA1
a619addb3e3770f21f7702a661a998c24d4235ff

SHA256
d9e9967d9b0a57ba755a9d09bcfa269ee889d9e2e144c8ae60df9387f1cec93a

SHA512
b16c4fdeb516702648381609bd500a92a5936fdba51663b112ce87f95dd938467b1de50c164a38354eb51666a698e88774b4972e19313408d33d19c8d0186258

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
64KB

MD5
9766fbc7986b54d3edfcad39970d3087

SHA1
12757e9ff805fc4ed408ccafd4419276743b6cad

SHA256
448d6943c6c0979e4b94c5b5072a196dbd81ab5b6e96ffd509e4702f0c7ffe98

SHA512
a246ed61950f3527bba0de356dd2a4e1a7b815547d36600cde3ed972ea3f709b6afbd02c7b9ee2e9450730b5bd0ac42ed8afcb51797733da1c3c5bd414ae25a3

Download Submit
memory/1840-10-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1840-21-0x00000000002F0000-0x0000000000302000-memory.dmp

Filesize
72KB

Download
memory/1840-78-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1840-85-0x00000000002F0000-0x0000000000302000-memory.dmp

Filesize
72KB

Download
memory/1844-2-0x0000000000020000-0x0000000000032000-memory.dmp

Filesize
72KB

Download
memory/1844-8-0x0000000000400000-0x0000000000403000-memory.dmp

Filesize
12KB

Download
memory/2984-23-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads