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

Static analysis result for SHA-256 88029893d6aac1da…

MALICIOUS

Office (OLE) / .XLS

510.0 KB Created: 2021-02-16 18:52:34 Authoring application: Microsoft Excel
MD5: 73910cd9a8689d47d176575118a9617f SHA-1: f24f0ecefeeea9d1ab4476e612d218ff488c991b SHA-256: 88029893d6aac1da2291879dc5b9b742ce4d7a2764ea871d6ba5fb17944ccbee
380 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell

The file is an XLS document containing VBA macros, specifically a Workbook_Open macro that utilizes WScript.Shell and CreateObject. This indicates the macro is designed to execute commands or launch other processes upon opening. The presence of WScript.Shell and Shell() calls strongly suggests the intent is to download and execute a second-stage payload, a common technique for initial access and further infection.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • 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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
2c6b90e19598dd4ae3f6b75a7fdfd2d571acf3fcdb2a13863f5dbc2876a5b93f		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2478 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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