Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 62d25ce8b725dc16…

MALICIOUS

Office (OLE) / .XLS

129.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel
MD5: cf7fbc7be223d432aa87fe86ab2d341a SHA-1: 1292602bb470a7936922646d0b45a51e7e0c7fbe SHA-256: 62d25ce8b725dc16035e625e3b561796daa4d8c676b0df576a7633d7b33138fe
360 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is a malicious Excel file containing VBA macros. The Workbook_Open macro triggers the execution of WScript.Shell to download and write a file to disk, likely a second-stage payload. The script attempts to establish persistence by writing to the Run key 'HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy'.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
69ffc37d116a1cd9f891dfa8935bf0edacb185b518ce674022d44098dbc15372		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 13972 bytes

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