0895a73b33ad7c25c24ad0bf7149d7335322c591aa304e38fef45b7308a5f994

Analysis

max time kernel
149s
max time network
138s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
12/11/2024, 19:24

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General

Target
0895a73b33ad7c25c24ad0bf7149d7335322c591aa304e38fef45b7308a5f994.exe
Size 63KB
Sample241112-x4eheszarm
SHA256 0895a73b33ad7c25c24ad0bf7149d7335322c591aa304e38fef45b7308a5f994
MD5 1176f9231721bacef22294e5159a9901
SHA1 3b0e559d2e0cb64b6fc51fef546c5054ddb5e287
SHA512 949f4d39a4e15e7b70f8bb87d9276e6257ad9ef8e796f61ee835733dc9df22567216f56f8006d6120032ee1db574e8af7206f30f4bb3e8e2f8b58bb892deaff2
SSDEEP 768:LAUJmQCcmLCXQq6fsKiJYsIkjJVzqsVH5kuGyLddOW/XtNKvhdnu:MUNHFKQbIkHvHtdOsKJE
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

defense_evasion discovery 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\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

Boot or Logon Autostart Execution: Active Setup 2 TTPs 4 IoCs

Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

persistence

Active Setup

T1547.014

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47594841-534f-4c53-4759-4841534F4c53}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47594841-534f-4c53-4759-4841534F4c53}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47594841-534f-4c53-4759-4841534F4c53}\IsInstalled = "1"	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{47594841-534f-4c53-4759-4841534F4c53}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	rmass.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\drivers\etc\hosts	rmass.exe

Event Triggered Execution: Image File Execution Options Injection 1 TTPs 3 IoCs

persistence

Image File Execution Options Injection

T1546.012

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
3468	rmass.exe
1432	rmass.exe

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

Indicator Removal: Clear Persistence 1 TTPs 1 IoCs

remove IFEO.

defense_evasion

Clear Persistence

T1070.009

description	ioc	Process
Delete value	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe\Debugger	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\ahuy.exe	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	0895a73b33ad7c25c24ad0bf7149d7335322c591aa304e38fef45b7308a5f994.exe
File created	C:\Windows\SysWOW64\rmass.exe	0895a73b33ad7c25c24ad0bf7149d7335322c591aa304e38fef45b7308a5f994.exe
File opened for modification	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\idbg32.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\rmass.exe	rmass.exe
File opened for modification	C:\Windows\SysWOW64\ntdbg.exe	rmass.exe
File created	C:\Windows\SysWOW64\ntdbg.exe	rmass.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/2900-0-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral2/files/0x000d000000023b68-5.dat	upx
behavioral2/memory/2900-7-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral2/memory/3468-41-0x0000000000400000-0x0000000000412000-memory.dmp	upx
behavioral2/memory/1432-46-0x0000000000400000-0x0000000000412000-memory.dmp	upx

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

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	0895a73b33ad7c25c24ad0bf7149d7335322c591aa304e38fef45b7308a5f994.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rmass.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rmass.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
3468	rmass.exe
3468	rmass.exe
3468	rmass.exe
3468	rmass.exe
3468	rmass.exe
3468	rmass.exe
1432	rmass.exe
1432	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2900	0895a73b33ad7c25c24ad0bf7149d7335322c591aa304e38fef45b7308a5f994.exe
Token: SeDebugPrivilege	3468	rmass.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 2900 wrote to memory of 3468	2900	0895a73b33ad7c25c24ad0bf7149d7335322c591aa304e38fef45b7308a5f994.exe	83
PID 2900 wrote to memory of 3468	2900	0895a73b33ad7c25c24ad0bf7149d7335322c591aa304e38fef45b7308a5f994.exe	83
PID 2900 wrote to memory of 3468	2900	0895a73b33ad7c25c24ad0bf7149d7335322c591aa304e38fef45b7308a5f994.exe	83
PID 3468 wrote to memory of 612	3468	rmass.exe	5
PID 3468 wrote to memory of 1432	3468	rmass.exe	84
PID 3468 wrote to memory of 1432	3468	rmass.exe	84
PID 3468 wrote to memory of 1432	3468	rmass.exe	84
PID 3468 wrote to memory of 3416	3468	rmass.exe	56

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:612

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3416
- C:\Users\Admin\AppData\Local\Temp\0895a73b33ad7c25c24ad0bf7149d7335322c591aa304e38fef45b7308a5f994.exe
  "C:\Users\Admin\AppData\Local\Temp\0895a73b33ad7c25c24ad0bf7149d7335322c591aa304e38fef45b7308a5f994.exe"
  2⤵
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2900
- - C:\Windows\SysWOW64\rmass.exe
    "C:\Windows\system32\rmass.exe"
    3⤵
    - Windows security bypass
    - Boot or Logon Autostart Execution: Active Setup
    - Drops file in Drivers directory
    - Event Triggered Execution: Image File Execution Options Injection
    - Executes dropped EXE
    - Windows security modification
    - Indicator Removal: Clear Persistence
    - Modifies WinLogon
    - Drops file in System32 directory
    - Drops file in Program Files directory
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:3468
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      PID:1432

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Active Setup

T1547.014

Winlogon Helper DLL

T1547.004

Event Triggered Execution

T1546

Image File Execution Options Injection

T1546.012

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Active Setup

T1547.014

Winlogon Helper DLL

T1547.004

Event Triggered Execution

T1546

Image File Execution Options Injection

T1546.012

Defense Evasion

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Indicator Removal

T1070

Clear Persistence

T1070.009

Modify Registry

T1112

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

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 cbcbc60fba71d01355fdbf9c17462085c5157ac7b63d0947e2307286f5368124
MD5 26d81b6407c77187d3e0d3d164d41d8b
SHA1 6194ccc0882d2c3b341e1fdedb7b6cfc596828d2
SHA512 2fe6b7a4bba449ab80dd85b2157e69b1091c74fee66efe71e3efc0d2eb5934349d8a5c1863864ae1bf17aef0b406dd08836d7a902a03c37f61ca679e6c75b772
SSDEEP 48:6CsDe2/WJbm73k2vZcsrkqSq2cxc2G5ZwJOFl:SDRoa73kQ/kqqAD
MD5 SHA1 SHA512 SSDEEP

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ahuy.exe

Path C:\Windows\SysWOW64\ahuy.exe
Size 65KB
SHA256 67de72253e763c6f2fd7d9050a888052aebcc2901d9d90f75edcbaa5f7837b77
MD5 0883ab1289cd6b29d93b11a4885ae8dc
SHA1 ac75b23bed81934003388c4f67ba769b83ffc8ea
SHA512 2605f93f5871c605c841107f3a349c9165ae359e3b2ae7599c54aecff3b1d188e8904d2a7b3552872fa0ad0be4194c8688cac0a91ee0b26dc86f4393d8f50278
SSDEEP 768:jIU2A4uNim/iMKvi09RCvQCO9D08MhDj3u2z9vZfOAFJxPVJQel81etxZ8L/Koww:j4A4uMmKMF6nv74WrVN
MD5 SHA1 SHA512 SSDEEP

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ntdbg.exe

Path C:\Windows\SysWOW64\ntdbg.exe
Size 66KB
SHA256 5b76bd34969141fe078aa609bdc8583a4f693e4acb2d70be6dd03b418c9cebcf
MD5 1c3b9e1e15598c1e98284765f01ceae9
SHA1 b77167967867b6f27ff905851f55bf4adb6a93ef
SHA512 daf784be4dde14b5e3c6e87dbbc6402a03b663807f2425c8f0f327cc870fd646984f0c01b6dbdd597d6ae1ac156e1602ec5f96a3dcd6086f857d2879683ce6a5
SSDEEP 1536:EFH0yILg8qn4RmsGSClDIDmhEcNgNQFgNyX45qh:y5wg8q4eSClDIixSNy6qh
MD5 SHA1 SHA512 SSDEEP

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rmass.exe

Path C:\Windows\SysWOW64\rmass.exe
Size 63KB
SHA256 0895a73b33ad7c25c24ad0bf7149d7335322c591aa304e38fef45b7308a5f994
MD5 1176f9231721bacef22294e5159a9901
SHA1 3b0e559d2e0cb64b6fc51fef546c5054ddb5e287
SHA512 949f4d39a4e15e7b70f8bb87d9276e6257ad9ef8e796f61ee835733dc9df22567216f56f8006d6120032ee1db574e8af7206f30f4bb3e8e2f8b58bb892deaff2
SSDEEP 768:LAUJmQCcmLCXQq6fsKiJYsIkjJVzqsVH5kuGyLddOW/XtNKvhdnu:MUNHFKQbIkHvHtdOsKJE
MD5 SHA1 SHA512 SSDEEP

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hosts

Path C:\Windows\System32\drivers\etc\hosts
Size 1KB
SHA256 15c7218eb9cef5fa0573db657b15ce3a5f0e0609f1166df8098ca7152df505b4
MD5 6f47b62de25d1745e296a06b3f98ed19
SHA1 a688bb35a4c8a5cc198985d624a1b5a6ac5b9f6f
SHA512 dea26fff8060f44bf20fe4fff2ecbacf428727f10c0f5886fb4813e28fce9cbc3d088337c84edd9857b18514c83f1bb1cf0f51518aaecef09f30e921f4d758d7
MD5 SHA1 SHA512

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memory/1432-46-0x0000000000400000-0x0000000000412000-memory.dmp

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memory/2900-0-0x0000000000400000-0x0000000000412000-memory.dmp

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memory/2900-7-0x0000000000400000-0x0000000000412000-memory.dmp

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memory/3468-41-0x0000000000400000-0x0000000000412000-memory.dmp

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