Office (OLE) malware analysis — malicious · 4c8fb3d543219aca

MALICIOUS

Office (OLE)

435.5 KB Created: 2008-06-25 02:59:37 Authoring application: Microsoft Excel

MD5: 088f026efe301ec099097f4c7544a97f SHA-1: 12881ca30b2be7700a1ede531934fc49a77eaf66 SHA-256: 4c8fb3d543219acabae277c89a06d488c997831a9d3d6beec72b0cd39884dc2d

300 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is an Excel 4.0 macro sheet that utilizes VBA to execute commands via WScript.Shell. The script attempts to create a CAB file, extract executables from it, and then copy these executables to various system locations including the user's Startup folder and SendTo directory. Specifically, it extracts 'normal.dot', 'norma1.xlm', and 'internet.exe'. The script also attempts to create a shortcut in the SendTo folder pointing to 'c:\sendto.exe', indicating an attempt to establish persistence or facilitate further execution. The presence of 'WScript.Shell usage' and 'Shell() call in VBA' heuristics strongly supports this analysis.

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
Encrypted Excel 4.0 macro sheet high OLE_XLM_ENCRYPTED_MACROSHEET

Workbook contains an Excel 4.0 macro sheet and BIFF FILEPASS encryption. Password-protected XLM macro sheets, especially the default Excel password path, are a common malware evasion pattern because static formula extraction may fail until the workbook is decrypted.
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN

Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Suspicious extracted artifact medium 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `071361a99a1431d40e0c3041987210a7a2134c5eb423dbe3dcb87fe5192b4347`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2808 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).

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