Office (OLE) / .XLS malware analysis — malicious · ff8e13cb45301146

MALICIOUS

Office (OLE) / .XLS

100.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel First seen: 2022-04-08

MD5: 33c06dfea83a3d4a639b12354f1f7aac SHA-1: a9a637abed2ed94572c4bd796705086dc3a7eeb1 SHA-256: ff8e13cb4530114696195243b945bf564568eff5222247cd88acaa87e37a6191

340 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The sample is an Excel file containing a Workbook_Open VBA macro. This macro utilizes WScript.Shell to execute a payload, as indicated by the critical OLE_VBA_SHELL and OLE_VBA_WSCRIPT heuristic firings. The macro is designed to run automatically when the workbook is opened, indicating a malicious intent to execute arbitrary code. No specific family could be identified, but the technique is common for initial access.

Heuristics 8

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
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.
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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `960033dc176c35ea3aa89ec236fe18ac093b61336979ce384778a828c4551e26`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	14195 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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