Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 517851cae2a5b932…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:11 Authoring application: Microsoft Excel First seen: 2021-11-02
MD5: d1cc845b6e08bcb86edf9efe7e9d1315 SHA-1: 2e00497f9c2dbf49306290744a111937b209669d SHA-256: 517851cae2a5b932c427f467cf36d640a6153a14c520c56a03c375cda9569467
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, which is a known method for executing malicious code. The presence of the 'RUN=0' formula API suggests the macro is designed to execute external commands. While no specific URLs or hashes were extracted, the Auto_Open macro is highly indicative of a downloader or initial execution stage for a more complex attack.

Heuristics 3

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6827 bytes
SHA-256: 2665cd405a7d7008fd82cb168edd354d0b7df7ea8adde8396cb14b94cc1c01bd
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  rbvSTspUFww
' 0018     24 LABEL : Cell Value, String Constant - aEEtCOcND len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E151 
' 0018     27 LABEL : Cell Value, String Constant - aybLTJfRoDcz len=0 
' 0018     22 LABEL : Cell Value, String Constant - djPgLTS len=0 
' 0018     20 LABEL : Cell Value, String Constant - EkKqf len=0 
' 0018     22 LABEL : Cell Value, String Constant - ErXumad len=0 
' 0018     20 LABEL : Cell Value, String Constant - fwrSy len=0 
' 0018     20 LABEL : Cell Value, String Constant - gfhWO len=0 
' 0018     21 LABEL : Cell Value, String Constant - HTdkEe len=0 
' 0018     25 LABEL : Cell Value, String Constant - hXBVNGsGYm len=0 
' 0018     27 LABEL : Cell Value, String Constant - iaJiIYmyZgmF len=0 
' 0018     26 LABEL : Cell Value, String Constant - IstOkAPVGgB len=0 
' 0018     21 LABEL : Cell Value, String Constant - jCOjhp len=0 
' 0018     26 LABEL : Cell Value, String Constant - jkFupDOJLWe len=0 
' 0018     22 LABEL : Cell Value, String Constant - KNHVdHn len=0 
' 0018     21 LABEL : Cell Value, String Constant - LArfZD len=0 
' 0018     26 LABEL : Cell Value, String Constant - mULynXNNdar len=0 
' 0018     20 LABEL : Cell Value, String Constant - oUBnV len=0 
' 0018     21 LABEL : Cell Value, String Constant - PnUvpv len=0 
' 0018     20 LABEL : Cell Value, String Constant - uWSQv len=0 
' 0018     27 LABEL : Cell Value, String Constant - zmkTMSRyWDvU len=0 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LAB
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.