Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 c74441bb3efbd624…

MALICIOUS

Office (OLE) / .XLS

44.5 KB Created: 2016-07-28 05:17:34 Authoring application: Microsoft Excel First seen: 2022-11-04
MD5: 07a2105937ab7f4c610bc1eefb784a29 SHA-1: 645c0ef504d47a55ca1aa25a501d66ea80b5a59a SHA-256: c74441bb3efbd6243efde0045134c7c55c794985bf7a321a6dd475f9c795f6ac
390 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1105 Ingress Tool Transfer T1059.003 Windows Command Shell

The Workbook_Open macro is designed to download and execute a second-stage payload. It constructs a command to download a file from the embedded URL 'http://106.249.253.146:12582/common/malDownFilePath.do?trnKey=20200122nleSLHhG^&type=fileDownload^&trnType=EML^&statType=XLS_RAN_EXEC' to the user's temporary directory as 'fileDownloader.exe'. The use of Shell() and cmd.exe indicates a clear intent to execute arbitrary code.

Heuristics 11

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL
    VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.
  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://106.249.253.146:12582/common/malDownFilePath.do?trnKey=20200122nleSLHhG^&type=fileDownload^&trnType=EML^&statType=XLS_RAN_EXEC

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
9a588871093593afeb38098172418a9e4a6918ed4b3448df0c1e5c5e956c0789		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3148 bytes

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