Office (OLE) / .XLS malware analysis — malicious · a0f53834d6788a39

MALICIOUS

Office (OLE) / .XLS

352.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel First seen: 2022-03-04

MD5: 2b9c4d6ac067d49056c20e5f1c154e7f SHA-1: c0c83117b9e6bf102d9a462cf7073a224537f7b2 SHA-256: a0f53834d6788a39ba094116edb1e78e982d4cb9f894c09e1159115345d2090d

340 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is a malicious Excel file containing VBA macros. The Workbook_Open event is triggered, which in turn calls WScript.Shell to execute a payload. The script heavily obfuscates its functionality with non-standard characters and variable names, making a precise determination of the payload difficult. However, the use of WScript.Shell and the Workbook_Open auto-execution strongly suggests a downloader or initial execution stage.

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` `e45d3f3ff3e7ea4a4283ba961b92a29390ef973861c1947ca83909d6df5e3b1d`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	13726 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 2 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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