Office (OLE) / .XLS malware analysis — malicious · ed54751752911825

MALICIOUS

Office (OLE) / .XLS

145.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel First seen: 2022-03-08

MD5: 2b4cc4919758bff4495ad56b00e08eb2 SHA-1: 848d163c21eb3f81ce26b3d7be5fb4ce306025c4 SHA-256: ed547517529118252ba26fbd651ee61170c58450865325a1562c351932163707

340 Risk Score

Malware Insights

MITRE ATT&CK

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

The Workbook_Open macro in the VBA script utilizes WScript.Shell to access the user's 'Templates' special folder. This indicates an intent to download and execute a second-stage payload, a common technique for malware delivery. The script's heavy obfuscation and reliance on WScript.Shell for execution are strong indicators of malicious activity.

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` `0a8e43aeb412d310724c7fa5f7c2d087636750aed0732cbcd6e9606d438e1543`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	31035 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 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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