450f0d45400d78f4754a1221f1601b83bc64ad04e26374d84f2aa7cd259dfcb4

Analysis

max time kernel
170s
max time network
157s
platform
windows7_x64
resource
win7-20230831-en
resource tags

arch:x64arch:x86image:win7-20230831-enlocale:en-usos:windows7-x64system
submitted
12/10/2023, 01:18

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General

Target

f95d58c0de3e890264669c4acf4bd8f5_JC.exe
Size

18KB
MD5

f95d58c0de3e890264669c4acf4bd8f5
SHA1

6fc609d2af3c7e3b42e47b7305145c4580567311
SHA256

450f0d45400d78f4754a1221f1601b83bc64ad04e26374d84f2aa7cd259dfcb4
SHA512

29092ed09bc3136171abe5004691be5d28bf2748eadeafb0d067ad501ca9db3a8006466a86300f25512cabd456e9eb61d217743a6a01f0d01cc3ae0743cc09b9
SSDEEP

384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvXf43:rRkiLw3HsDSARGG/w3

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\{47504646-574c-5049-4750-4646574C5049}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{47504646-574c-5049-4750-4646574C5049}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{47504646-574c-5049-4750-4646574C5049}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{47504646-574c-5049-4750-4646574C5049}\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
2812	rmass.exe
2808	rmass.exe

Loads dropped DLL 3 IoCs

pid	Process
1672	f95d58c0de3e890264669c4acf4bd8f5_JC.exe
1672	f95d58c0de3e890264669c4acf4bd8f5_JC.exe
2812	rmass.exe

UPX packed file 12 IoCs

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

upx

resource	yara_rule
behavioral1/memory/1672-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x0015000000011fff-4.dat	upx
behavioral1/memory/1672-10-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x0015000000011fff-18.dat	upx
behavioral1/files/0x0015000000011fff-13.dat	upx
behavioral1/files/0x0015000000011fff-12.dat	upx
behavioral1/files/0x0015000000011fff-7.dat	upx
behavioral1/files/0x0015000000011fff-6.dat	upx
behavioral1/files/0x0015000000011fff-20.dat	upx
behavioral1/memory/2812-25-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2808-26-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2812-56-0x0000000000400000-0x0000000000411000-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}\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	f95d58c0de3e890264669c4acf4bd8f5_JC.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\idbg32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	f95d58c0de3e890264669c4acf4bd8f5_JC.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\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\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 4 IoCs

pid	Process
2812	rmass.exe
2812	rmass.exe
2812	rmass.exe
2808	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1672	f95d58c0de3e890264669c4acf4bd8f5_JC.exe
Token: SeDebugPrivilege	2812	rmass.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1672 wrote to memory of 2812	1672	f95d58c0de3e890264669c4acf4bd8f5_JC.exe	29
PID 1672 wrote to memory of 2812	1672	f95d58c0de3e890264669c4acf4bd8f5_JC.exe	29
PID 1672 wrote to memory of 2812	1672	f95d58c0de3e890264669c4acf4bd8f5_JC.exe	29
PID 1672 wrote to memory of 2812	1672	f95d58c0de3e890264669c4acf4bd8f5_JC.exe	29
PID 2812 wrote to memory of 432	2812	rmass.exe	3
PID 2812 wrote to memory of 1224	2812	rmass.exe	11
PID 2812 wrote to memory of 2808	2812	rmass.exe	31
PID 2812 wrote to memory of 2808	2812	rmass.exe	31
PID 2812 wrote to memory of 2808	2812	rmass.exe	31
PID 2812 wrote to memory of 2808	2812	rmass.exe	31

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:432

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1224
- C:\Users\Admin\AppData\Local\Temp\f95d58c0de3e890264669c4acf4bd8f5_JC.exe
  "C:\Users\Admin\AppData\Local\Temp\f95d58c0de3e890264669c4acf4bd8f5_JC.exe"
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1672
- - 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:2812
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:2808

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

C:\Windows\SysWOW64\RECOVER32.DLL

Filesize
5KB

MD5
2b2c28a7a01f9584fe220ef84003427f

SHA1
5fc023df0b5064045eb8de7f2dbe26f07f6fec70

SHA256
9e00af53b1d0c0f5270d94a666d95aa7b4dcb9fea49487c210c055c9dcfcc9eb

SHA512
39192a8a91dec1abff25af8dac0cf39da4dfd51b3fb4f1ef0b4e776185d4280fbe8387c2ea778da7bbf2ce288b0bce4d23cbe8d9e87bbd250159044f5adbac78

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

Filesize
21KB

MD5
093cd23ce14b21b6ef78790d25c5c953

SHA1
107e055e57958ffcaa0e96c9316484032164817f

SHA256
b78d429cc9e599ef9afcd454db8c16fa9d89f1858153e3b774c8c1d4b6344a3d

SHA512
77e04d5c237f3b3442ee0d797abfede903fe80d2916640d198199e9d9777c406e265f7a121b23cbdec0ba35cfef38249bdc56b9079faf0681ebb9f4920987bd8

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

Filesize
22KB

MD5
58fa6e2943744a82486a63f9ea9aa68e

SHA1
9722806436608d2dc5dc4420f4072413552f0f8f

SHA256
ab923b9099e9bfc17810d6aa4451b42bd120818f1589832560c90c1f9f606b19

SHA512
b1b428a127a503aaf11f1e9a9cefd8de3b75c6d5fde0919619afc3ccfcb71d19feeef9e033d0a78a82dfce310284329238ef7c08de096fe814a0ff1b5d5982f0

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

Filesize
18KB

MD5
f95d58c0de3e890264669c4acf4bd8f5

SHA1
6fc609d2af3c7e3b42e47b7305145c4580567311

SHA256
450f0d45400d78f4754a1221f1601b83bc64ad04e26374d84f2aa7cd259dfcb4

SHA512
29092ed09bc3136171abe5004691be5d28bf2748eadeafb0d067ad501ca9db3a8006466a86300f25512cabd456e9eb61d217743a6a01f0d01cc3ae0743cc09b9

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

Filesize
18KB

MD5
f95d58c0de3e890264669c4acf4bd8f5

SHA1
6fc609d2af3c7e3b42e47b7305145c4580567311

SHA256
450f0d45400d78f4754a1221f1601b83bc64ad04e26374d84f2aa7cd259dfcb4

SHA512
29092ed09bc3136171abe5004691be5d28bf2748eadeafb0d067ad501ca9db3a8006466a86300f25512cabd456e9eb61d217743a6a01f0d01cc3ae0743cc09b9

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

Filesize
18KB

MD5
f95d58c0de3e890264669c4acf4bd8f5

SHA1
6fc609d2af3c7e3b42e47b7305145c4580567311

SHA256
450f0d45400d78f4754a1221f1601b83bc64ad04e26374d84f2aa7cd259dfcb4

SHA512
29092ed09bc3136171abe5004691be5d28bf2748eadeafb0d067ad501ca9db3a8006466a86300f25512cabd456e9eb61d217743a6a01f0d01cc3ae0743cc09b9

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

Filesize
18KB

MD5
f95d58c0de3e890264669c4acf4bd8f5

SHA1
6fc609d2af3c7e3b42e47b7305145c4580567311

SHA256
450f0d45400d78f4754a1221f1601b83bc64ad04e26374d84f2aa7cd259dfcb4

SHA512
29092ed09bc3136171abe5004691be5d28bf2748eadeafb0d067ad501ca9db3a8006466a86300f25512cabd456e9eb61d217743a6a01f0d01cc3ae0743cc09b9

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
18KB

MD5
f95d58c0de3e890264669c4acf4bd8f5

SHA1
6fc609d2af3c7e3b42e47b7305145c4580567311

SHA256
450f0d45400d78f4754a1221f1601b83bc64ad04e26374d84f2aa7cd259dfcb4

SHA512
29092ed09bc3136171abe5004691be5d28bf2748eadeafb0d067ad501ca9db3a8006466a86300f25512cabd456e9eb61d217743a6a01f0d01cc3ae0743cc09b9

Download Submit
\Windows\SysWOW64\rmass.exe

Filesize
18KB

MD5
f95d58c0de3e890264669c4acf4bd8f5

SHA1
6fc609d2af3c7e3b42e47b7305145c4580567311

SHA256
450f0d45400d78f4754a1221f1601b83bc64ad04e26374d84f2aa7cd259dfcb4

SHA512
29092ed09bc3136171abe5004691be5d28bf2748eadeafb0d067ad501ca9db3a8006466a86300f25512cabd456e9eb61d217743a6a01f0d01cc3ae0743cc09b9

Download Submit
\Windows\SysWOW64\rmass.exe

Filesize
18KB

MD5
f95d58c0de3e890264669c4acf4bd8f5

SHA1
6fc609d2af3c7e3b42e47b7305145c4580567311

SHA256
450f0d45400d78f4754a1221f1601b83bc64ad04e26374d84f2aa7cd259dfcb4

SHA512
29092ed09bc3136171abe5004691be5d28bf2748eadeafb0d067ad501ca9db3a8006466a86300f25512cabd456e9eb61d217743a6a01f0d01cc3ae0743cc09b9

Download Submit
memory/1672-51-0x0000000000320000-0x0000000000331000-memory.dmp

Filesize
68KB

Download
memory/1672-10-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/1672-11-0x0000000000320000-0x0000000000331000-memory.dmp

Filesize
68KB

Download
memory/1672-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2808-26-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2812-19-0x0000000000420000-0x0000000000431000-memory.dmp

Filesize
68KB

Download
memory/2812-25-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2812-52-0x0000000000420000-0x0000000000431000-memory.dmp

Filesize
68KB

Download
memory/2812-56-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download