Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a04464d87cbeda34…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:43:48 Authoring application: Microsoft Excel First seen: 2021-05-26
MD5: 6f88f6b97840dd7e9698afa0718596b7 SHA-1: f56e054bc092983938b3e1c12650804971c859b1 SHA-256: a04464d87cbeda34f5861b5a2fa42c94ee752e6ba16051acd1d9311d615b917d
140 Risk Score

Malware Insights

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

The file is an Excel document containing Excel 4.0 macros, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN heuristics. The Auto_Open macro is configured to execute, and the presence of 'risky-formula=2; RUN=0' suggests it attempts to run external code. This is a common technique for downloading and executing further malicious content.

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) 6582 bytes
SHA-256: 3f3b347571372b4b3dde934d64487e912637d1b2c11098c0a1f1cb64e38a0562
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  NUSl
' 0018     22 LABEL : Cell Value, String Constant - ALTyiGh len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E185 
' 0018     24 LABEL : Cell Value, String Constant - DDzVppCAo len=0 
' 0018     23 LABEL : Cell Value, String Constant - ePhzHyHm len=0 
' 0018     21 LABEL : Cell Value, String Constant - HNLCKS len=0 
' 0018     22 LABEL : Cell Value, String Constant - IswLkTc len=0 
' 0018     25 LABEL : Cell Value, String Constant - IxfCTLcgKL len=0 
' 0018     22 LABEL : Cell Value, String Constant - JmUJKLA len=0 
' 0018     26 LABEL : Cell Value, String Constant - mihFwKiVjXL len=0 
' 0018     23 LABEL : Cell Value, String Constant - nWulJQeh len=0 
' 0018     25 LABEL : Cell Value, String Constant - ovUyoxhGmn len=0 
' 0018     26 LABEL : Cell Value, String Constant - oWTIPWVxMck len=0 
' 0018     23 LABEL : Cell Value, String Constant - pOoEHOYC len=0 
' 0018     24 LABEL : Cell Value, String Constant - SoWmGFYvz len=0 
' 0018     22 LABEL : Cell Value, String Constant - tklODff len=0 
' 0018     23 LABEL : Cell Value, String Constant - ugkyTAiR len=0 
' 0018     22 LABEL : Cell Value, String Constant - WzuLENc len=0 
' 0018     24 LABEL : Cell Value, String Constant - XIBfhzgbk len=0 
' 0018     22 LABEL : Cell Value, String Constant - xRQGyVg len=0 
' 0018     20 LABEL : Cell Value, String Constant - XweHl len=0 
' 0018     26 LABEL : Cell Value, String Constant - yDifJVvIJYz 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)

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