e2e7ded53edeb4d9b01c6c8073f1820df39ae8ed1e29204a64f67f739c0f6f5f

Analysis

max time kernel
149s
max time network
121s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
26/05/2024, 04:03

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General

Target
e2e7ded53edeb4d9b01c6c8073f1820df39ae8ed1e29204a64f67f739c0f6f5f.exe
Size 22KB
Sample240526-emsdvafa47
SHA256 e2e7ded53edeb4d9b01c6c8073f1820df39ae8ed1e29204a64f67f739c0f6f5f
MD5 2be528b4d2ddb4d37d4e916a334d030a
SHA1 51510972d8d3a80b0c9f0fbed8b28cb9bbf17791
SHA512 f8a8c40aab9c87c5842806c6025a97718f6479d130cdb55936aed384b22acb0031b5e1c2485bdc90dc5368ab0861623bc5f23009ce99c7c4c3bcac87df440d91
SSDEEP 384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvX8Mb7a6c8j:rRkiLw3HsDSARGG/MMb7rcE
MD5 SHA1 SHA512 SSDEEP

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
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{484B554C-4249-4255-484B-554C42494255}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	rmass.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{484B554C-4249-4255-484B-554C42494255}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{484B554C-4249-4255-484B-554C42494255}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{484B554C-4249-4255-484B-554C42494255}\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
3060	rmass.exe
2616	rmass.exe

Loads dropped DLL 3 IoCs

pid	Process
1296	e2e7ded53edeb4d9b01c6c8073f1820df39ae8ed1e29204a64f67f739c0f6f5f.exe
1296	e2e7ded53edeb4d9b01c6c8073f1820df39ae8ed1e29204a64f67f739c0f6f5f.exe
3060	rmass.exe

UPX packed file 9 IoCs

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

upx

resource	yara_rule
behavioral1/memory/1296-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x000d00000001340c-4.dat	upx
behavioral1/memory/1296-5-0x0000000000330000-0x0000000000341000-memory.dmp	upx
behavioral1/memory/3060-14-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/1296-12-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2616-27-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/3060-26-0x0000000000320000-0x0000000000331000-memory.dmp	upx
behavioral1/memory/3060-61-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2616-62-0x0000000000400000-0x0000000000411000-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\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
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\FirewallDisableNotify = "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}\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
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

Drops file in System32 directory 12 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\rmass.exe	e2e7ded53edeb4d9b01c6c8073f1820df39ae8ed1e29204a64f67f739c0f6f5f.exe
File opened for modification	C:\Windows\SysWOW64\ntdbg.exe	rmass.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\RECOVER32.DLL	rmass.exe
File opened for modification	C:\Windows\SysWOW64\winrnt.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	e2e7ded53edeb4d9b01c6c8073f1820df39ae8ed1e29204a64f67f739c0f6f5f.exe
File opened for modification	C:\Windows\SysWOW64\ahuy.exe	rmass.exe
File created	C:\Windows\SysWOW64\RECOVER32.DLL	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

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
3060	rmass.exe
3060	rmass.exe
3060	rmass.exe
2616	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1296	e2e7ded53edeb4d9b01c6c8073f1820df39ae8ed1e29204a64f67f739c0f6f5f.exe
Token: SeDebugPrivilege	3060	rmass.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1296 wrote to memory of 3060	1296	e2e7ded53edeb4d9b01c6c8073f1820df39ae8ed1e29204a64f67f739c0f6f5f.exe	28
PID 1296 wrote to memory of 3060	1296	e2e7ded53edeb4d9b01c6c8073f1820df39ae8ed1e29204a64f67f739c0f6f5f.exe	28
PID 1296 wrote to memory of 3060	1296	e2e7ded53edeb4d9b01c6c8073f1820df39ae8ed1e29204a64f67f739c0f6f5f.exe	28
PID 1296 wrote to memory of 3060	1296	e2e7ded53edeb4d9b01c6c8073f1820df39ae8ed1e29204a64f67f739c0f6f5f.exe	28
PID 3060 wrote to memory of 436	3060	rmass.exe	5
PID 3060 wrote to memory of 1160	3060	rmass.exe	20
PID 3060 wrote to memory of 2616	3060	rmass.exe	29
PID 3060 wrote to memory of 2616	3060	rmass.exe	29
PID 3060 wrote to memory of 2616	3060	rmass.exe	29
PID 3060 wrote to memory of 2616	3060	rmass.exe	29

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

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1160
- C:\Users\Admin\AppData\Local\Temp\e2e7ded53edeb4d9b01c6c8073f1820df39ae8ed1e29204a64f67f739c0f6f5f.exe
  "C:\Users\Admin\AppData\Local\Temp\e2e7ded53edeb4d9b01c6c8073f1820df39ae8ed1e29204a64f67f739c0f6f5f.exe"
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1296
- - 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:3060
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:2616

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Defense Evasion

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

RECOVER32.DLL

Path C:\Windows\SysWOW64\RECOVER32.DLL
Size 5KB
SHA256 9e00af53b1d0c0f5270d94a666d95aa7b4dcb9fea49487c210c055c9dcfcc9eb
MD5 2b2c28a7a01f9584fe220ef84003427f
SHA1 5fc023df0b5064045eb8de7f2dbe26f07f6fec70
SHA512 39192a8a91dec1abff25af8dac0cf39da4dfd51b3fb4f1ef0b4e776185d4280fbe8387c2ea778da7bbf2ce288b0bce4d23cbe8d9e87bbd250159044f5adbac78
SSDEEP 48:6CsrGV5e2/WJbm73k2vZcsrkqSq2cxc2G5ZwJOFl:SqV5Roa73kQ/kqqAD
MD5 SHA1 SHA512 SSDEEP

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ahuy.exe

Path C:\Windows\SysWOW64\ahuy.exe
Size 24KB
SHA256 98273665d3ef49a109eca3869e8b0c80e202d49f45226a00eedda67df407f7be
MD5 489c3e6e45a62c325e70ed0167056fea
SHA1 289c5153027ee7ab61609f6648c26f93d73e6cbe
SHA512 38f3fed702fb6d0b7ff897d215f18fae83ce3f553f379b86c68b6f8ec2fcf1c8c3b16dc5ef853b77d3e20e566399300929ca28571f082066f93bc9b7d1b3c081
SSDEEP 768:jIUbOMmbjSe/JFzeqLoPcAyHHYkQxlAfuo:j1OMieqL0EAyDeafuo
MD5 SHA1 SHA512 SSDEEP

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ntdbg.exe

Path C:\Windows\SysWOW64\ntdbg.exe
Size 25KB
SHA256 56512de216f04b06047e55dbde6491cced7e9e3e610d374186421b597e7fa068
MD5 d3fde081fd27ad33c1f699d7d3f4b567
SHA1 55c51f2867a04e284d62d522a385cc286c0c2acf
SHA512 66738593ab5961257da4eb63fdcc745ba74d9a895eb9da8be0b713ca21a263553c133f5eaeae03fda2061acdc62fb37a66faaefff326929896fd004f2e3fbdf6
SSDEEP 768:ErzO3iru9KWiUAIzw028B2xqUc+3O6W2n5:EWFbAww02HqdYX5
MD5 SHA1 SHA512 SSDEEP

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hosts

Path C:\Windows\System32\drivers\etc\hosts
Size 1KB
SHA256 0eef3217095cb97b695c434e74d6314bf9e869a013d6e9c88e58c34576a276b4
MD5 b10b13206b0f2cf3968050072f6979bf
SHA1 699db21ba9cecf3f13ac3d76e22cfa41aa94da80
SHA512 d33bfd931be6676539507a69101d99fa4c5ef36b12422bd11f063b9b6a47b7444f6c4ad5f35e044714fdb872e96cd9fddf049e8329af1219483887f6ac5f4a5d
MD5 SHA1 SHA512

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rmass.exe

Path \Windows\SysWOW64\rmass.exe
Size 22KB
SHA256 e2e7ded53edeb4d9b01c6c8073f1820df39ae8ed1e29204a64f67f739c0f6f5f
MD5 2be528b4d2ddb4d37d4e916a334d030a
SHA1 51510972d8d3a80b0c9f0fbed8b28cb9bbf17791
SHA512 f8a8c40aab9c87c5842806c6025a97718f6479d130cdb55936aed384b22acb0031b5e1c2485bdc90dc5368ab0861623bc5f23009ce99c7c4c3bcac87df440d91
SSDEEP 384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvX8Mb7a6c8j:rRkiLw3HsDSARGG/MMb7rcE
MD5 SHA1 SHA512 SSDEEP

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memory/1296-5-0x0000000000330000-0x0000000000341000-memory.dmp

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memory/1296-0-0x0000000000400000-0x0000000000411000-memory.dmp

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memory/1296-12-0x0000000000400000-0x0000000000411000-memory.dmp

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memory/2616-62-0x0000000000400000-0x0000000000411000-memory.dmp

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memory/2616-27-0x0000000000400000-0x0000000000411000-memory.dmp

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memory/3060-14-0x0000000000400000-0x0000000000411000-memory.dmp

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memory/3060-61-0x0000000000400000-0x0000000000411000-memory.dmp

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memory/3060-101-0x0000000000320000-0x0000000000331000-memory.dmp

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memory/3060-26-0x0000000000320000-0x0000000000331000-memory.dmp

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