Office (OLE) / .XLS malware analysis — malicious · 6141fdde9b6772df

MALICIOUS

Office (OLE) / .XLS

143.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel First seen: 2022-03-08

MD5: f12cc3d995c28c051f61b85044ca3f6a SHA-1: 904eb935e070fad7867cded7331b40fc223ee3ed SHA-256: 6141fdde9b6772df007694194e493c19fd16b72032037203557de9c02105917a

362 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The Excel file contains a Workbook_Open VBA macro that utilizes WScript.Shell to download and execute a second-stage payload. The macro references WScript.Shell and uses CreateObject, indicating an attempt to run external code. The presence of a long encoded blob and the 'macros.bas' file further suggest malicious macro 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` `3b4e4de254d370270b684f5ed763975213498f9becea68236f25ed6b1f3f4bf8`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	30743 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).

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