ae1a812c59ad845abceb14c638f0b56a2f6ea39992b60c9f3e1c3de4cbcd8637

General

Target

ae1a812c59ad845abceb14c638f0b56a2f6ea39992b60c9f3e1c3de4cbcd8637.exe
Size

23KB
MD5

5e0b191aa165e811cca3c66660cb8f28
SHA1

0abf81bfc052da32c0451e9961905711817a839a
SHA256

ae1a812c59ad845abceb14c638f0b56a2f6ea39992b60c9f3e1c3de4cbcd8637
SHA512

953d15567306fd3346446b0e20899e314a0f363222aaf22422efa7fb6aae6a53be91c21c7dd484c4437c037b0c111733573f8dc7474b356c90b9450ac17cb7a3
SSDEEP

384:jIz4fBFuZDSAOmKSaK0tALBW0+JHP/EFg6xOOIn34XTBTSQmM4oxsn5N/YJoDxBp:jIUDsDSAOmHaKtLQ/EFg6DI1Fx

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\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

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\{50584853-5450-5055-5058-485354505055}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{50584853-5450-5055-5058-485354505055}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{50584853-5450-5055-5058-485354505055}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{50584853-5450-5055-5058-485354505055}\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\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
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe\0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890 = "a"	rmass.exe

Executes dropped EXE 2 IoCs

pid	Process
4540	rmass.exe
3540	rmass.exe

UPX packed file 4 IoCs

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

upx

resource	yara_rule
behavioral2/memory/4540-5-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/files/0x0009000000023644-4.dat	upx
behavioral2/memory/4540-48-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral2/memory/3540-49-0x0000000000400000-0x0000000000411000-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\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
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "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	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
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\{BC84DF00-BC38-9902-8082-6FCBF2D87A0B}	rmass.exe

Drops file in System32 directory 12 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\rmass.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	ae1a812c59ad845abceb14c638f0b56a2f6ea39992b60c9f3e1c3de4cbcd8637.exe
File opened for modification	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\winrnt.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\idbg32.exe	rmass.exe
File created	C:\Windows\SysWOW64\rmass.exe	ae1a812c59ad845abceb14c638f0b56a2f6ea39992b60c9f3e1c3de4cbcd8637.exe
File created	C:\Windows\SysWOW64\ntdbg.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\aset32.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
4540	rmass.exe
4540	rmass.exe
4540	rmass.exe
4540	rmass.exe
4540	rmass.exe
4540	rmass.exe
3540	rmass.exe
3540	rmass.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4540	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 2516 wrote to memory of 4540	2516	ae1a812c59ad845abceb14c638f0b56a2f6ea39992b60c9f3e1c3de4cbcd8637.exe	89
PID 2516 wrote to memory of 4540	2516	ae1a812c59ad845abceb14c638f0b56a2f6ea39992b60c9f3e1c3de4cbcd8637.exe	89
PID 2516 wrote to memory of 4540	2516	ae1a812c59ad845abceb14c638f0b56a2f6ea39992b60c9f3e1c3de4cbcd8637.exe	89
PID 4540 wrote to memory of 3540	4540	rmass.exe	90
PID 4540 wrote to memory of 3540	4540	rmass.exe	90
PID 4540 wrote to memory of 3540	4540	rmass.exe	90
PID 4540 wrote to memory of 632	4540	rmass.exe	5
PID 4540 wrote to memory of 3484	4540	rmass.exe	56

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:632

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3484
- C:\Users\Admin\AppData\Local\Temp\ae1a812c59ad845abceb14c638f0b56a2f6ea39992b60c9f3e1c3de4cbcd8637.exe
  "C:\Users\Admin\AppData\Local\Temp\ae1a812c59ad845abceb14c638f0b56a2f6ea39992b60c9f3e1c3de4cbcd8637.exe"
  2⤵
  - Drops file in System32 directory
  - Suspicious use of WriteProcessMemory
  PID:2516
- - 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
    - 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:4540
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:3540

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=4308,i,6041070687820623968,3004230300437737550,262144 --variations-seed-version --mojo-platform-channel-handle=3476 /prefetch:8
1⤵
PID:3172

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
23KB

MD5
bccbe128aec52e3c2afdcd317c4e4fa7

SHA1
ff9311be266e5d3335987aeaf4d5b024e5a771f7

SHA256
e538ad15e493c848a17fd5daebcc5298d7fe425279c39782690bdda05d8d202f

SHA512
7a77f0995425483590e3083358690656e8e390ecd83ad5455704449e2b23e32bdf3d4ae1e9a4a71103654897c264d1dde1e03448626ddc8cc964c873e36d628e

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

Filesize
24KB

MD5
b266161ae0acb9294da7a0a080ce7f6c

SHA1
7158c551b81a3e10c4ec0f3891be20f203ebce2c

SHA256
6f3b2d5bdf766b02e96e2281a77489143646228641631a5108c9f261eefbaa49

SHA512
d80de4d709712e1210ce717064cf144add17f285eb4b61a88226743725bbe2932a8126d0e611d2a5a32578fd9059647718203642d58b9f2307813fb94d060ffc

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

Filesize
20KB

MD5
a1523b75198e9673836ef6a026686218

SHA1
081de73565d24941e6bf5dfe0c1a0769032518ff

SHA256
f5b7d022bd967601a330f57b9f1bc362de13c0f005353599bff09c38764f06bd

SHA512
383bcd37934e931529168e36ac8821d700b5db066a2b75cbbecccbb5d14c8f138ee71e9b6fcdc5dab808b6ca833ead70f362c190e797b7d10fb7c03cd930d663

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

Filesize
1KB

MD5
6f47b62de25d1745e296a06b3f98ed19

SHA1
a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f

SHA256
15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4

SHA512
dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7

Download Submit
memory/2516-3-0x0000000000400000-0x0000000000403000-memory.dmp

Filesize
12KB

Download
memory/3540-49-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4540-5-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/4540-48-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads