Office (OLE) / .XLS malware analysis — malicious · 1693df1ea4b2dc1d

MALICIOUS

Office (OLE) / .XLS

166.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel First seen: 2022-03-03

MD5: dcc5217e849c5f940cec2cf398c3f8d7 SHA-1: e1d7f0934340aae12d4c3b0f074c85108b09bed8 SHA-256: 1693df1ea4b2dc1d31c9569599e48cb8e9282e251b3a3318e71a88ef6ea72027

362 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1059 Command and Scripting Interpreter T1204.002 Malicious File

The Workbook_Open macro in the VBA script utilizes WScript.Shell to access the user's Templates directory. It then proceeds to download and execute a second-stage payload, as indicated by the critical OLE_VBA_HTTP_DROP_EXEC heuristic. The use of WScript.Shell and the download/execute behavior strongly suggest a downloader or droppper functionality.

Heuristics 9

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
Suspicious extracted artifact info 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` `5fb4e011b7fe0e4d4a021918ec3a8e9eca370f099dbd06214e51cca896511a86`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	12691 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).

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