Office (OLE) / .XLS malware analysis — malicious · 45bcabf288969b9c

MALICIOUS

Office (OLE) / .XLS

311.0 KB Created: 2012-09-06 04:46:10 Authoring application: Microsoft Excel

MD5: 2199204abe718c9cc31484b54ac3439b SHA-1: ecf97be09b1c4ffd90835cdcecfaa92f3aad7af2 SHA-256: 45bcabf288969b9c2cdc99584a7d890078255cb4019c052470d01f3c675d686a

288 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell

The file is an Excel spreadsheet containing VBA macros, specifically a Workbook_Open macro designed to execute automatically. Heuristics indicate the use of ShellExecute, CreateObject, and GetObject, common for launching malicious code. The document body contains text that attempts to trick the user into enabling macros by mentioning 'no macros' and providing links for users without macros enabled, which is a common lure. The presence of 'macros.bas' as an extracted artifact further supports the macro-based execution.

Heuristics 9

Reference to ShellExecute API high SC_STR_SHELLEXEC

Reference to ShellExecute API
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
GetObject call high OLE_VBA_GETOBJ

GetObject 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
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `366915bffcff84de6f7cbedf463d95ea01ad5be61860ab75f205fe5ab2870a54`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	56236 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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