Office (OLE) / .XLS malware analysis — malicious · a44dbeac1a88ae3a

MALICIOUS

Office (OLE) / .XLS

1.07 MB Created: 1997-01-08 22:48:59 Authoring application: Microsoft Excel

MD5: d64a45d74417039c808e9ab2d5df1f1d SHA-1: 0f8299c1f859fe54cf590e428d6cee71922aa87a SHA-256: a44dbeac1a88ae3acf566ee3fe880a189aa72635d8e2e0ee0ba96f12308d3a96

380 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 spreadsheet containing a large VBA macro. The Auto_Open macro is present and uses WScript.Shell and CreateObject to execute code, indicating a malicious intent to run arbitrary commands. The presence of CreateProcess and WScript heuristics further supports this. The macro likely downloads and executes a second-stage payload, as suggested by the combination of these indicators. The document body content appears to be unrelated product specification data, suggesting it's a lure.

Heuristics 9

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
Reference to CreateProcess API high SC_STR_CREATEPROCESS

Reference to CreateProcess API
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
Auto_Open macro high OLE_VBA_AUTO

Auto_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` `8ab7eb3e3ffb6993ac34141b961a98955158b32e8ab2b002117ed0f31b62d136`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	157637 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 25 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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