Office (OLE) / .XLSX malware analysis — malicious · be980f509a1e135e

MALICIOUS

Office (OLE) / .XLSX

44.5 KB Created: 2000-03-29 17:06:04 Authoring application: Microsoft Excel

MD5: 2a8e02bc61a2a4df50a92eea4f1d1fc3 SHA-1: 1a74b82f4c22b0722ea707d0e114efb769b9229b SHA-256: be980f509a1e135e83ee1cef3d544d324cb47a50cc64322489acc29f8b54d87a

400 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file contains VBA macros with AutoOpen, Auto_Open, and Auto_Close functions, indicating an attempt to automatically execute code upon opening. Critical heuristics indicate a Shell() call within the VBA code, and ClamAV detections confirm it as a Trojan. The script appears to be designed to download and execute a second-stage payload, as suggested by the heuristic 'VBA p-code auto-exec with execution tokens' and the truncated script content which hints at file operations and potential execution.

Heuristics 9

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
ClamAV: Doc.Trojan.Shiver-2 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Trojan.Shiver-2
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
AutoOpen macro high OLE_VBA_AUTOOPEN

AutoOpen macro
Auto_Open macro high OLE_VBA_AUTO

Auto_Open macro
Auto_Close macro high OLE_VBA_AUTOCLOSE

Auto_Close macro
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` `953b564a1f3e257d24d78accdfc6a2b867aaa31e77bef460a99ce95408ae90a8`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	34798 bytes
Detection ClamAV: Doc.Trojan.Shiver-1 Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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