Office (OLE) malware analysis — malicious · d157634fa6f8dc9a

MALICIOUS

Office (OLE)

367.0 KB Created: 2009-03-18 02:41:52 Authoring application: Microsoft Excel

MD5: 03ec608c3b241aa23099c6ee313e1c55 SHA-1: fb6d0011b355f02aa4627ed75415e1ddf6ebb647 SHA-256: d157634fa6f8dc9aeec266afb87a94c697cade421816e3b02521f851d72b9e8a

260 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 document containing VBA macros that leverage WScript.Shell to execute commands. Specifically, it attempts to create a CAB file, extract executables from it, and then copy these files to various system locations including the user's Startup folder and SendTo directory. The script also interacts with Word to copy 'normal.dot' to the Word startup path. This indicates a downloader or dropper functionality, aiming to establish persistence and execute further malicious code.

Heuristics 7

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
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.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Suspicious extracted artifact medium 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `071361a99a1431d40e0c3041987210a7a2134c5eb423dbe3dcb87fe5192b4347`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2808 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).

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