618db48934b3e4f6fcc4b9c1d00df6a57ac3f1fa2bc4f36d8a4334b06b6753bf

General

Target

618db48934b3e4f6fcc4b9c1d00df6a57ac3f1fa2bc4f36d8a4334b06b6753bf.exe
Size

45KB
MD5

58243bbc5a523896b3874c1978f16720
SHA1

89d3672cc0e4292f3a0c582059bdacc0faa7f0a7
SHA256

618db48934b3e4f6fcc4b9c1d00df6a57ac3f1fa2bc4f36d8a4334b06b6753bf
SHA512

2f6b5e5661d1d8973518b4642e87f92482a4cc2c25dc22bd678ef41542876ef025c1094b5a79fd9fcfa9d410381bb99007265cc1a2d9beea3702b7d0a0adfba9
SSDEEP

768:WAUJmQCcmLCXQq6fsKiJYsIkjJVzqsVG5kuGVAQvr90g:RUNHFKQbIkHvGkAy

Score

10^/10

evasion persistence trojan

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

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\{4748505A-5247-4643-4748-505A52474643}\StubPath = "C:\\Windows\\system32\\ahuy.exe"	rmass.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4748505A-5247-4643-4748-505A52474643}	rmass.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4748505A-5247-4643-4748-505A52474643}\01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 = "a"	rmass.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{4748505A-5247-4643-4748-505A52474643}\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
2228	rmass.exe
2916	rmass.exe

Loads dropped DLL 3 IoCs

pid	Process
1724	618db48934b3e4f6fcc4b9c1d00df6a57ac3f1fa2bc4f36d8a4334b06b6753bf.exe
1724	618db48934b3e4f6fcc4b9c1d00df6a57ac3f1fa2bc4f36d8a4334b06b6753bf.exe
2228	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

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 opened for modification	C:\Windows\SysWOW64\rmass.exe	618db48934b3e4f6fcc4b9c1d00df6a57ac3f1fa2bc4f36d8a4334b06b6753bf.exe
File created	C:\Windows\SysWOW64\rmass.exe	618db48934b3e4f6fcc4b9c1d00df6a57ac3f1fa2bc4f36d8a4334b06b6753bf.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\rmass.exe	rmass.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 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\idbg32.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
2228	rmass.exe
2228	rmass.exe
2228	rmass.exe
2916	rmass.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1724	618db48934b3e4f6fcc4b9c1d00df6a57ac3f1fa2bc4f36d8a4334b06b6753bf.exe
Token: SeDebugPrivilege	2228	rmass.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1724 wrote to memory of 2228	1724	618db48934b3e4f6fcc4b9c1d00df6a57ac3f1fa2bc4f36d8a4334b06b6753bf.exe	28
PID 1724 wrote to memory of 2228	1724	618db48934b3e4f6fcc4b9c1d00df6a57ac3f1fa2bc4f36d8a4334b06b6753bf.exe	28
PID 1724 wrote to memory of 2228	1724	618db48934b3e4f6fcc4b9c1d00df6a57ac3f1fa2bc4f36d8a4334b06b6753bf.exe	28
PID 1724 wrote to memory of 2228	1724	618db48934b3e4f6fcc4b9c1d00df6a57ac3f1fa2bc4f36d8a4334b06b6753bf.exe	28
PID 2228 wrote to memory of 436	2228	rmass.exe	5
PID 2228 wrote to memory of 1196	2228	rmass.exe	21
PID 2228 wrote to memory of 2916	2228	rmass.exe	29
PID 2228 wrote to memory of 2916	2228	rmass.exe	29
PID 2228 wrote to memory of 2916	2228	rmass.exe	29
PID 2228 wrote to memory of 2916	2228	rmass.exe	29

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

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:1196
- C:\Users\Admin\AppData\Local\Temp\618db48934b3e4f6fcc4b9c1d00df6a57ac3f1fa2bc4f36d8a4334b06b6753bf.exe
  "C:\Users\Admin\AppData\Local\Temp\618db48934b3e4f6fcc4b9c1d00df6a57ac3f1fa2bc4f36d8a4334b06b6753bf.exe"
  2⤵
  - Loads dropped DLL
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1724
- - 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:2228
  - - C:\Windows\SysWOW64\rmass.exe
      --k33p
      4⤵
      Executes dropped EXE
      Suspicious behavior: EnumeratesProcesses
      PID:2916

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
47KB

MD5
e14137120bbcfa285f9e822831d14fd9

SHA1
a80d62f3d773585fc6911adffc9d944b79620bdc

SHA256
0fad45b3cb9b0efbb5d8cdb1c2413fc293c5ff5dcabe48f85a8a3dc80a525b8e

SHA512
41e6a398b897b917bee01bebf472776a9ba026d993937d4cd9b327f8a0a7315d480f2c4227cf52197ba68fab2ffb4bc9a53ba5874aee62d53407ddbaf8537c80

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

Filesize
48KB

MD5
89c8fabd9a6ca293343e4de3b1995819

SHA1
7eeccfc07aa2f5ab6b3baa3d77d6f0a1701e84a8

SHA256
2439eea823789267e0153e9adfe8ad2f3a2e08e7b8a57b264b20267ca116151f

SHA512
5a7cba6336515d0abfca82a6cbe856a3275e6d4a7ef2328babd3037df2a968e2047c6fb8ce72674106ba2f2dfba308b9afcee53699411c02fe3390a042d09df5

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

Filesize
45KB

MD5
58243bbc5a523896b3874c1978f16720

SHA1
89d3672cc0e4292f3a0c582059bdacc0faa7f0a7

SHA256
618db48934b3e4f6fcc4b9c1d00df6a57ac3f1fa2bc4f36d8a4334b06b6753bf

SHA512
2f6b5e5661d1d8973518b4642e87f92482a4cc2c25dc22bd678ef41542876ef025c1094b5a79fd9fcfa9d410381bb99007265cc1a2d9beea3702b7d0a0adfba9

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

Filesize
1KB

MD5
b10b13206b0f2cf3968050072f6979bf

SHA1
699db21ba9cecf3f13ac3d76e22cfa41aa94da80

SHA256
0eef3217095cb97b695c434e74d6314bf9e869a013d6e9c88e58c34576a276b4

SHA512
d33bfd931be6676539507a69101d99fa4c5ef36b12422bd11f063b9b6a47b7444f6c4ad5f35e044714fdb872e96cd9fddf049e8329af1219483887f6ac5f4a5d

Download Submit
memory/1724-9-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download
memory/2228-55-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download
memory/2916-56-0x0000000000400000-0x000000000040E000-memory.dmp

Filesize
56KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads