Office (OLE) / .XLSX malware analysis — malicious · 90ab9afb53b059a5

MALICIOUS

Office (OLE) / .XLSX

143.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel First seen: 2022-12-07

MD5: 03ca1ca883cfb83747c256260f866db2 SHA-1: d2359b80e2c74d22d2c6ee58ec21e617ca616188 SHA-256: 90ab9afb53b059a5e5fb9625190cb53942a6e00c301d34a5cac59617547043fb

422 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer T1204.002 Malicious File

The file contains VBA macros, including a Workbook_Open event, which are commonly used for malicious purposes. Critical heuristics indicate the use of WScript.Shell and a Shell() call, suggesting the macro attempts to download and execute a payload. The ClamAV detection of 'Xls.Malware.Valyria-10032145-0' further supports its malicious nature.

Heuristics 10

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.
ClamAV: Xls.Malware.Valyria-10032145-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Valyria-10032145-0
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` `6110224701c305ba2b44e408b86b93518a95285ea6a34873538f3b45dbfe1fd4`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	28388 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 113 long base64-like blob(s).

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