Office (OLE) / .XLS malware analysis — malicious · 961b47c49f43f4d0

MALICIOUS

Office (OLE) / .XLS

226.0 KB Created: 2020-05-16 13:49:11 Authoring application: Microsoft Excel

MD5: 09ea9605591791ec6fe895510fb41b16 SHA-1: 34612030e9197cc287957c8a927149e7950845bb SHA-256: 961b47c49f43f4d04e7db819c23cfad9b07ba67ecea0484408867bcbf607e235

440 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is an Excel file containing VBA macros, specifically a Workbook_Open macro that executes code. This macro uses ShellExecute and URLDownloadToFile APIs, indicating it likely downloads and executes a second-stage payload. The presence of WScript.Shell usage and CreateObject calls further suggests malicious script execution. The document body prompts the user to 'Enable content' to view a 'transaction receipt', a common lure for macro-based malware.

Heuristics 10

Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
Reference to ShellExecute API high SC_STR_SHELLEXEC

Reference to ShellExecute API
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.
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `9a12f67800aa4a2de1d94d511ee4958b94515c28c7410aff01088156078bea2d`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	12419 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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