388f41980693087295c6ac1c7d8b68afc8619afdac814790696fdc089de01790

Analysis

max time kernel
150s
max time network
124s
platform
windows7_x64
resource
win7-20231023-en
resource tags

arch:x64arch:x86image:win7-20231023-enlocale:en-usos:windows7-x64system
submitted
04/11/2023, 12:17

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General

Target

NEAS.b1afeb5d13529fa4b6e4a1d6349da9f0.exe
Size

18KB
MD5

b1afeb5d13529fa4b6e4a1d6349da9f0
SHA1

1a2629398b9bc5e40e017b9e0510b394e67d198d
SHA256

388f41980693087295c6ac1c7d8b68afc8619afdac814790696fdc089de01790
SHA512

a4b23042ae081f8a42bff8cbae11ca0bc179088dd5b685ef2ecad9d813b3ef09161e00f8e74458ebab305d2e3680011086e17f2f338093867e574cf6e2c8b686
SSDEEP

384:UBWoC5GDr6wc/w3HgM6vDUTAXBGCVf4WVlFvXz6:rRkiLw3HsDSARGG/j6

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\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
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\AntiVirusOverride = "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\{41484C42-5259-4a4f-4148-4C4252594a4f}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{41484C42-5259-4a4f-4148-4C4252594a4f}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{41484C42-5259-4a4f-4148-4C4252594a4f}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{41484C42-5259-4a4f-4148-4C4252594a4f}\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
2576	rmass.exe
2724	rmass.exe

Loads dropped DLL 3 IoCs

pid	Process
2864	NEAS.b1afeb5d13529fa4b6e4a1d6349da9f0.exe
2864	NEAS.b1afeb5d13529fa4b6e4a1d6349da9f0.exe
2576	rmass.exe

UPX packed file 13 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2864-0-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x00080000000120ca-4.dat	upx
behavioral1/memory/2864-5-0x0000000000320000-0x0000000000331000-memory.dmp	upx
behavioral1/memory/2864-11-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x00080000000120ca-14.dat	upx
behavioral1/files/0x00080000000120ca-13.dat	upx
behavioral1/memory/2576-23-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/files/0x00080000000120ca-8.dat	upx
behavioral1/files/0x00080000000120ca-7.dat	upx
behavioral1/files/0x00080000000120ca-26.dat	upx
behavioral1/files/0x00080000000120ca-24.dat	upx
behavioral1/memory/2576-51-0x0000000000400000-0x0000000000411000-memory.dmp	upx
behavioral1/memory/2724-59-0x0000000000400000-0x0000000000411000-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
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\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\idbg32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	NEAS.b1afeb5d13529fa4b6e4a1d6349da9f0.exe
File created	C:\Windows\SysWOW64\rmass.exe	NEAS.b1afeb5d13529fa4b6e4a1d6349da9f0.exe
File created	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\aset32.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
2576	rmass.exe
2576	rmass.exe
2576	rmass.exe
2724	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2864	NEAS.b1afeb5d13529fa4b6e4a1d6349da9f0.exe
Token: SeDebugPrivilege	2576	rmass.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2864 wrote to memory of 2576	2864	NEAS.b1afeb5d13529fa4b6e4a1d6349da9f0.exe	28
PID 2864 wrote to memory of 2576	2864	NEAS.b1afeb5d13529fa4b6e4a1d6349da9f0.exe	28
PID 2864 wrote to memory of 2576	2864	NEAS.b1afeb5d13529fa4b6e4a1d6349da9f0.exe	28
PID 2864 wrote to memory of 2576	2864	NEAS.b1afeb5d13529fa4b6e4a1d6349da9f0.exe	28
PID 2576 wrote to memory of 424	2576	rmass.exe	2
PID 2576 wrote to memory of 1196	2576	rmass.exe	21
PID 2576 wrote to memory of 2724	2576	rmass.exe	29
PID 2576 wrote to memory of 2724	2576	rmass.exe	29
PID 2576 wrote to memory of 2724	2576	rmass.exe	29
PID 2576 wrote to memory of 2724	2576	rmass.exe	29

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:424

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1196
- C:\Users\Admin\AppData\Local\Temp\NEAS.b1afeb5d13529fa4b6e4a1d6349da9f0.exe
  "C:\Users\Admin\AppData\Local\Temp\NEAS.b1afeb5d13529fa4b6e4a1d6349da9f0.exe"
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2864
- - 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:2576
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:2724

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
20KB

MD5
948da3fc1a436d14689d5674456c5347

SHA1
da1c8bef2c1e9747e83c2ec6017c595f183622b9

SHA256
393cf2636354de1638da3df260ea43cb9cca775750abc04eb445ff6ec53a704c

SHA512
31450f9b7743860f9716404f8001abbdb189928a9fb90af442496d9086745020218cc2b5703fde7d09c4cd06646d22df6f5af0381c45d9defdbfb43e3ec9cdcf

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

Filesize
21KB

MD5
4983d1fc7ad66c7d46e9a17563e9332e

SHA1
04873d38bb7a012dc6d131d5610df0c1c41df49c

SHA256
6188afa2a93ba2616e23eea4608af5dd3bbea12b002648236cd440933b87aef3

SHA512
a73e9e231f5811aa767c4db70f296542c5349a4d30c10d901dc84dc3526bf7fd4e50c56ff7961728347e400368a6093d66919df6998cee7fbd98c797abea0ed0

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

Filesize
18KB

MD5
b1afeb5d13529fa4b6e4a1d6349da9f0

SHA1
1a2629398b9bc5e40e017b9e0510b394e67d198d

SHA256
388f41980693087295c6ac1c7d8b68afc8619afdac814790696fdc089de01790

SHA512
a4b23042ae081f8a42bff8cbae11ca0bc179088dd5b685ef2ecad9d813b3ef09161e00f8e74458ebab305d2e3680011086e17f2f338093867e574cf6e2c8b686

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

Filesize
18KB

MD5
b1afeb5d13529fa4b6e4a1d6349da9f0

SHA1
1a2629398b9bc5e40e017b9e0510b394e67d198d

SHA256
388f41980693087295c6ac1c7d8b68afc8619afdac814790696fdc089de01790

SHA512
a4b23042ae081f8a42bff8cbae11ca0bc179088dd5b685ef2ecad9d813b3ef09161e00f8e74458ebab305d2e3680011086e17f2f338093867e574cf6e2c8b686

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

Filesize
18KB

MD5
b1afeb5d13529fa4b6e4a1d6349da9f0

SHA1
1a2629398b9bc5e40e017b9e0510b394e67d198d

SHA256
388f41980693087295c6ac1c7d8b68afc8619afdac814790696fdc089de01790

SHA512
a4b23042ae081f8a42bff8cbae11ca0bc179088dd5b685ef2ecad9d813b3ef09161e00f8e74458ebab305d2e3680011086e17f2f338093867e574cf6e2c8b686

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

Filesize
18KB

MD5
b1afeb5d13529fa4b6e4a1d6349da9f0

SHA1
1a2629398b9bc5e40e017b9e0510b394e67d198d

SHA256
388f41980693087295c6ac1c7d8b68afc8619afdac814790696fdc089de01790

SHA512
a4b23042ae081f8a42bff8cbae11ca0bc179088dd5b685ef2ecad9d813b3ef09161e00f8e74458ebab305d2e3680011086e17f2f338093867e574cf6e2c8b686

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
b1afeb5d13529fa4b6e4a1d6349da9f0

SHA1
1a2629398b9bc5e40e017b9e0510b394e67d198d

SHA256
388f41980693087295c6ac1c7d8b68afc8619afdac814790696fdc089de01790

SHA512
a4b23042ae081f8a42bff8cbae11ca0bc179088dd5b685ef2ecad9d813b3ef09161e00f8e74458ebab305d2e3680011086e17f2f338093867e574cf6e2c8b686

Download Submit
\Windows\SysWOW64\rmass.exe

Filesize
18KB

MD5
b1afeb5d13529fa4b6e4a1d6349da9f0

SHA1
1a2629398b9bc5e40e017b9e0510b394e67d198d

SHA256
388f41980693087295c6ac1c7d8b68afc8619afdac814790696fdc089de01790

SHA512
a4b23042ae081f8a42bff8cbae11ca0bc179088dd5b685ef2ecad9d813b3ef09161e00f8e74458ebab305d2e3680011086e17f2f338093867e574cf6e2c8b686

Download Submit
\Windows\SysWOW64\rmass.exe

Filesize
18KB

MD5
b1afeb5d13529fa4b6e4a1d6349da9f0

SHA1
1a2629398b9bc5e40e017b9e0510b394e67d198d

SHA256
388f41980693087295c6ac1c7d8b68afc8619afdac814790696fdc089de01790

SHA512
a4b23042ae081f8a42bff8cbae11ca0bc179088dd5b685ef2ecad9d813b3ef09161e00f8e74458ebab305d2e3680011086e17f2f338093867e574cf6e2c8b686

Download Submit
memory/2576-23-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2576-25-0x00000000003A0000-0x00000000003B1000-memory.dmp

Filesize
68KB

Download
memory/2576-51-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2724-59-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2864-12-0x0000000000320000-0x0000000000331000-memory.dmp

Filesize
68KB

Download
memory/2864-0-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2864-11-0x0000000000400000-0x0000000000411000-memory.dmp

Filesize
68KB

Download
memory/2864-5-0x0000000000320000-0x0000000000331000-memory.dmp

Filesize
68KB

Download