Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 078adbe58b47d22b…

MALICIOUS

Office (OOXML)

67.3 KB Created: 2012-10-19 22:33:57 UTC Authoring application: Microsoft Excel 12.0000
MD5: 7514bb01a93971bc6ac692347c8748ee SHA-1: 26090bd6eab2915cc5b2cce1174a4f863f3fbfe7 SHA-256: 078adbe58b47d22b043b8e58e08ca8e5db143e63d76b5356d193c85eb83d50aa
208 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The critical heuristic 'OLE_VBA_LOLBIN' and the 'OLE_VBA_WBOPEN' firing indicate the presence of a Workbook_Open macro. This macro utilizes 'CreateObject' and 'Environ()' to write a file named 'qScale.xsl' to the ALLUSERSPROFILE directory, likely to download and execute a second-stage payload. The script's complexity and obfuscation suggest a malicious intent to compromise the user's system.

Heuristics 6

  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin reference in VBA
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7418ec14225ec827ac98a1af11c1943b09c0059758248ddea34a490dd4b56e4f		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 3370 bytes
vbaProject_00.bin
dba12751a59d08ce854ee3567e2cafb5c7ead8c0199c98fcc95481ba920d2396		 vba-project OOXML VBA project: xl/vbaProject.bin 16896 bytes

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