Office (OLE) / .XLS malware analysis — malicious · 65b208943d8cf82a

MALICIOUS

Office (OLE) / .XLS

32.0 KB Created: 2022-04-13 09:33:10 Authoring application: Microsoft Excel First seen: 2022-04-14

MD5: 9f33887a8e76c246753e71b896a904b3 SHA-1: 19fa96a6d69146fceef3f3804cd978ec24adb3eb SHA-256: 65b208943d8cf82af902c39400bdd7a26fdbc94c23f9d4494cf0a2ca51233213

328 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File

The Workbook_Open macro executes obfuscated VBA code that uses CreateObject to instantiate an HTTP object and download a file from 'http://168.100.8.42/spisok.exe'. The downloaded file is saved to '%AppData%\runsx.exe' and then executed using the Shell() function. This indicates a downloader or droppper functionality, characteristic of initial-stage malware.

Heuristics 8

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC

VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER

Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
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.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `def54b951506720d74326f2a64262114b5a0f9f4cae765aedc30e4d49e9e3147`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1726 bytes

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