Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4b498ce21e6d0a18…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:54 Authoring application: Microsoft Excel First seen: 2021-09-16
MD5: 31c88bd787ad1521a482a784599dd9db SHA-1: ef2ead083cf80ee1328c6aa669168a1685dfceb9 SHA-256: 4b498ce21e6d0a18d82a35bb04cfee81513f97b80927c9c9bc7e1ea9c6267f6b
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 defined name, which is a common technique for executing malicious code. The `RUN=0` formula API within the XLM macro suggests it is designed to execute a command or payload. While no specific URLs or hashes were extracted, the Auto_Open macro itself is the primary indicator of malicious intent.

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) 6536 bytes
SHA-256: 5033469dafbd15b77e6c7d3747c530259908c65a505e767507a5a37b347a6a38
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  OPDjOXK
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G168 
' 0018     20 LABEL : Cell Value, String Constant - cEKHh len=0 
' 0018     24 LABEL : Cell Value, String Constant - dnDoyTxJZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - DzQpfaJFtE len=0 
' 0018     25 LABEL : Cell Value, String Constant - HBScKTljwn len=0 
' 0018     23 LABEL : Cell Value, String Constant - imZafoVf len=0 
' 0018     26 LABEL : Cell Value, String Constant - lkTNKnrhgDo len=0 
' 0018     27 LABEL : Cell Value, String Constant - MtjFPwhVidCG len=0 
' 0018     23 LABEL : Cell Value, String Constant - nifelRsU len=0 
' 0018     24 LABEL : Cell Value, String Constant - OVYOCShld len=0 
' 0018     27 LABEL : Cell Value, String Constant - OWruojzQhrzK len=0 
' 0018     23 LABEL : Cell Value, String Constant - PnwEDYxK len=0 
' 0018     22 LABEL : Cell Value, String Constant - pPGWAgy len=0 
' 0018     27 LABEL : Cell Value, String Constant - QBHqiXaLQRAf len=0 
' 0018     21 LABEL : Cell Value, String Constant - SPmlct len=0 
' 0018     23 LABEL : Cell Value, String Constant - ugUhAEfc len=0 
' 0018     21 LABEL : Cell Value, String Constant - VDbTTd len=0 
' 0018     24 LABEL : Cell Value, String Constant - wvwvkHMku len=0 
' 0018     20 LABEL : Cell Value, String Constant - xGQlu len=0 
' 0018     26 LABEL : Cell Value, String Constant - XnCCSdKNywe len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZwMmPDTSgJ 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
' 0
... (truncated)

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