Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 910e449d025890cc…

MALICIOUS

Office (OLE)

714.0 KB Created: 2021-07-14 08:38:23 Authoring application: Microsoft Excel
MD5: 9d35e17421e9a1c8458f32cd813bd27f SHA-1: 975187419fcb07d209ce896085fe5f4f09e9a118 SHA-256: 910e449d025890cc10c331f41de133f6865bb8fbe66facafec461b121e9aef1d
416 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1218.005 System Binary Proxy Execution: Mshta T1105 Ingress Tool Transfer T1566.001 Spearphishing Attachment

The Workbook_Open macro executes a script that concatenates characters from Sheet1 to form a string, which is then written to a file named 'qPercentOfColumn.sct' in the ALLUSERSPROFILE directory. This script is subsequently executed using mshta.exe. This behavior strongly suggests the macro is designed to download and execute a second-stage payload, aligning with common malware delivery techniques.

Heuristics 11

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin reference in VBA
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Reference to mshta.exe high SC_STR_MSHTA
    Reference to mshta.exe
  • 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 macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
14ddead471d1e013bd1e3bad0c28fa8d33fdab3f4a5cc798c7e168ba9b5b38c0		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1299 bytes

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