67f5353bdabe4d52ecb054b0ef0bd7faa2bc647843b56d3fab36e749b98a1e09

General

Target
gyns.exe
Size 385KB
Sample201109-evhhclypta
SHA256 67f5353bdabe4d52ecb054b0ef0bd7faa2bc647843b56d3fab36e749b98a1e09
MD5 28ee784e4cbd74c8a15b7064c89e570a
SHA1 8c82cfb8ab85948131872c3abf504cbf4dbbc52d
SHA512 38564f12d9ad743aa8eb1bddbe3fec097eb6d3dbe16d95736037b1efb98e1970eea90f4dda0e420978fb7f262efe86edcf5aedc25cd6a994fbbe2fe93bba0e64
MD5 SHA1 SHA512

Score

10^/10

agilenet persistence

Malware Config

Signatures

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\WINDOWS\\system32\\userinit.exe, \"C:\\Windows\\SysWOW64\\InstallCalc\\InstallCalc.exe\""	mscorsvw.exe

Executes dropped EXE 1 IoCs

pid	Process
1132	InstallCalc.exe

Loads dropped DLL 1 IoCs

pid	Process
1104	cmd.exe

Obfuscated with Agile.Net obfuscator 1 IoCs

Detects use of the Agile.Net commercial obfuscator, which is capable of entity renaming and control flow obfuscation.

agilenet

resource	yara_rule
behavioral1/memory/1972-3-0x00000000002F0000-0x00000000002FF000-memory.dmp	agile_net

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Windows\CurrentVersion\Run\	mscorsvw.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Windows\CurrentVersion\Run\InstallCalc = "\"C:\\Windows\\SysWOW64\\InstallCalc\\InstallCalc.exe\""	mscorsvw.exe

Modifies WinLogon 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	mscorsvw.exe

Drops file in System32 directory 4 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\InstallCalc\InstallCalc.exe	mscorsvw.exe
File created	C:\Windows\SysWOW64\InstallCalc\ngenservicelock.dat	InstallCalc.exe
File created	C:\Windows\SysWOW64\InstallCalc\ngenrootstorelock.dat	InstallCalc.exe
File created	C:\Windows\SysWOW64\InstallCalc\InstallCalc.exe	mscorsvw.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1972 set thread context of 268	1972	gyns.exe	29

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
1972	gyns.exe
1972	gyns.exe
1972	gyns.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1972	gyns.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 1972 wrote to memory of 268	1972	gyns.exe	29
PID 1972 wrote to memory of 268	1972	gyns.exe	29
PID 1972 wrote to memory of 268	1972	gyns.exe	29
PID 1972 wrote to memory of 268	1972	gyns.exe	29
PID 1972 wrote to memory of 268	1972	gyns.exe	29
PID 1972 wrote to memory of 268	1972	gyns.exe	29
PID 1972 wrote to memory of 268	1972	gyns.exe	29
PID 1972 wrote to memory of 268	1972	gyns.exe	29
PID 1972 wrote to memory of 268	1972	gyns.exe	29
PID 1972 wrote to memory of 268	1972	gyns.exe	29
PID 1972 wrote to memory of 268	1972	gyns.exe	29
PID 268 wrote to memory of 396	268	mscorsvw.exe	30
PID 268 wrote to memory of 396	268	mscorsvw.exe	30
PID 268 wrote to memory of 396	268	mscorsvw.exe	30
PID 268 wrote to memory of 396	268	mscorsvw.exe	30
PID 396 wrote to memory of 1104	396	WScript.exe	31
PID 396 wrote to memory of 1104	396	WScript.exe	31
PID 396 wrote to memory of 1104	396	WScript.exe	31
PID 396 wrote to memory of 1104	396	WScript.exe	31
PID 1104 wrote to memory of 1132	1104	cmd.exe	33
PID 1104 wrote to memory of 1132	1104	cmd.exe	33
PID 1104 wrote to memory of 1132	1104	cmd.exe	33
PID 1104 wrote to memory of 1132	1104	cmd.exe	33
PID 1104 wrote to memory of 1132	1104	cmd.exe	33
PID 1104 wrote to memory of 1132	1104	cmd.exe	33
PID 1104 wrote to memory of 1132	1104	cmd.exe	33

C:\Users\Admin\AppData\Local\Temp\gyns.exe
"C:\Users\Admin\AppData\Local\Temp\gyns.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1972
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\mscorsvw.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\mscorsvw.exe"
  2⤵
  - Modifies WinLogon for persistence
  - Adds Run key to start application
  - Modifies WinLogon
  - Drops file in System32 directory
  - Suspicious use of WriteProcessMemory
  PID:268
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:396
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c "C:\Windows\SysWOW64\InstallCalc\InstallCalc.exe"
      4⤵
      Loads dropped DLL
      Suspicious use of WriteProcessMemory
      PID:1104
    - - C:\Windows\SysWOW64\InstallCalc\InstallCalc.exe
        
        C:\Windows\SysWOW64\InstallCalc\InstallCalc.exe
        5⤵
        Executes dropped EXE
        Drops file in System32 directory
        
        PID:1132

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

Winlogon Helper DLL

Privilege Escalation

Defense Evasion

Modify Registry

3

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/396-14-0x0000000002860000-0x0000000002864000-memory.dmp

Download

memory/1972-6-0x00000000003A0000-0x00000000003A5000-memory.dmp

Download

memory/1972-0-0x0000000074200000-0x00000000748EE000-memory.dmp

Download

memory/1972-5-0x0000000000390000-0x0000000000392000-memory.dmp

Download

memory/1972-4-0x0000000000370000-0x0000000000372000-memory.dmp

Download

memory/1972-3-0x00000000002F0000-0x00000000002FF000-memory.dmp

Download

memory/1972-1-0x0000000000AF0000-0x0000000000AF1000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads