Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1130f116204e6989…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:01 Authoring application: Microsoft Excel First seen: 2021-09-22
MD5: 91c1249b2a8c02d0138105a6cdfcd69a SHA-1: b863bf91458d02c0d140236b3bf0f71356233dca SHA-256: 1130f116204e69894f6aab05c78358421ae324224244b020ca1c02e702dd1fd3
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding indicating potential for automatic execution upon opening. The presence of dangerous formula APIs like RUN further suggests the macro is designed to execute arbitrary code. While no specific family is identified, the technique points to a macro-based execution of a payload.

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) 6450 bytes
SHA-256: 0cf5deeba36a0a114f907d155fbcb3da5f560fbede9bcd8506b0ff98e63ae7d9
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  owZ
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G168 
' 0018     22 LABEL : Cell Value, String Constant - axyCgzu len=0 
' 0018     24 LABEL : Cell Value, String Constant - ChoFmPPbx len=0 
' 0018     24 LABEL : Cell Value, String Constant - DGPyUZJxw len=0 
' 0018     24 LABEL : Cell Value, String Constant - DyOZKJTCe len=0 
' 0018     20 LABEL : Cell Value, String Constant - hRtmM len=0 
' 0018     26 LABEL : Cell Value, String Constant - HYbyYvecvln len=0 
' 0018     22 LABEL : Cell Value, String Constant - IHlZNZD len=0 
' 0018     24 LABEL : Cell Value, String Constant - iVSgmYQRL len=0 
' 0018     20 LABEL : Cell Value, String Constant - jSrrh len=0 
' 0018     27 LABEL : Cell Value, String Constant - oiELFiRATrAg len=0 
' 0018     26 LABEL : Cell Value, String Constant - pKtVQiyxMia len=0 
' 0018     21 LABEL : Cell Value, String Constant - PUENSB len=0 
' 0018     25 LABEL : Cell Value, String Constant - qeUmwdzdJs len=0 
' 0018     24 LABEL : Cell Value, String Constant - qvhdpAJjW len=0 
' 0018     24 LABEL : Cell Value, String Constant - qvWjfBVcb len=0 
' 0018     21 LABEL : Cell Value, String Constant - SYXjff len=0 
' 0018     24 LABEL : Cell Value, String Constant - tOWnqaznA len=0 
' 0018     21 LABEL : Cell Value, String Constant - XSlCvQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - YxxofhHaqzRG len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZfwjdkuVkkpl 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    
... (truncated)

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