This strain was first discovered by Korben Dallas on Twitter on the 9th of January. As I already mentioned the Malware is delivered via a Malspam/Maldoc attack crafted for Users / Companies from Croatia. Researchers that were involved in the initial analysis: @KorbenD_Intel, @James_inthe_box, @Malwageddon, @pollo290987 and I (@f0wlsec). Thank you for your contributions!
@James_inthe_box @malwrhunterteam @Malwageddon
— Korben Dallas (@KorbenD_Intel) January 9, 2020
69450923d812f3696e8280508b636955 XLS 12/60 VT scan detections. Not nice.. upped to Malshare: https://t.co/jXxXrJxcB9 pic.twitter.com/TPfP0BCZOB
A general disclaimer as always: downloading and running the samples linked below will lead to the encryption of your personal data, so be f$cking careful. Also check with your local laws as owning malware binaries/ sources might be illegal depending on where you live.
Afrodita @ AnyRun | VirusTotal | HybridAnalysis
--> sha256 9b6681103545432cd1373492297a6a12528f327d14a7416c2b71cfdcbdafc90b
Here you can see three images extracted from the malicious Excel Docs. Funny how they didn't even bother to think of a fake company name for the second Logo :D
Afrodita uses a sleep routine for Sandbox evasion. In my Tests it took 30-60mins until the system was infected.
After unpacking the sample with UPX, Detect it easy returns the following:
It was likely build with a very new Version of Visual Studio (2019)
Below you can see a screenshot of PEBear from the Imports-Tab.
The extracted strings tell us quite a lot in this case. It looks like the internal name of the Project is Afrodita and it utilizes the CryptoPP Library. There are some references to .key files, but I haven't found a path or file on a infected machine yet. README_RECOVERY .txt is will be the filename of the Ransomnote. It's contents are embeded in the binary's .data section with Base64 encoding. Lastly Afrodita.dll is the rewritten file that is downloaded as a payload (originally notnice.jpg or verynice.jpg). It's executed via rundll32.exe Afrodita.dll,Sura.
The following filetypes will be encrypted by Afrodita:
.TXT, .ZIP, .DAT, .JPE, .JPG, .PNG, .JPEG, .GIF, .BMP, .EXIF, .MP4, .RAR, .M4A, .WMA, .AVI, .WMV, .MKV, .CSV, .M3U, .FLV, .WALLET, .JAVA, .CLASS, .HTML, .HTM, .CSS, .LUA, .ASP, .PHP, .INCPAS, .ASM, .HPP, .CPP, .SLN, .ACCDB, .MDB, .PPTM, .PPTX, .PPT, .XLK, .XLSB, .XLSM, .XLSX, .XLS, .WPS, .DOCM, .DOCX, .DOC, .ODB, .ODC, .ODM, .ODP, .ODS, .ACCDR, .ACCDT, .ACCDE, .D3DBSP, .SIE, .SQL, .BACKUPDB, .BACKUP, .BAK, .SUM, .IBANK, .T13, .T12, .QDF, .GDB, .TAX, .PKPASS, .SLDM, .SLDX, .PPSM, .PPSX, .PPAM, .POTM, .POTX, .PPS, .POT, .XLW, .XLL, .XLAM, .XLA, .XLTM, .XLTX, .XLM, .XLT, .DOTM, .DOTX, .DOT, .BC6, .BC7, .BKP, .QIC, .BKF, .SIDN, .SIDD, .MDDATA, .ITL, .ITDB, .ICXS, .HVPL, .HPLG, .HKDB, .MDBACKUP, .SYNCDB, .GHO, .CAS, .SVG, .MAP, .WMO, .ITM, .FOS, .MOV, .VDF, .ZTMP, .SIS, .SID, .NCF, .MENU, .LAYOUT, .DMP, .BLOB, .ESM, .VCF, .VTF, .DAZIP, .FPK, .MLX, .IWD, .VPK, .TOR, .PSK, .RIM, .W3X, .FSH, .NTL, .ARCH00, .LVL, .SNX, .CFR, .VPP_PC, .LRF, .MCMETA, .VFS0, .MPQGE, .KDB, .DB0, .DBA, .ROFL, .HKX, .BAR. .UPK, .DAS, .IWI, .LITEMOD, .ASSET, .FORGE, .LTX, .BSA, .APK, .RE4, .SAV, .LBF, .SLM, .BIK, .EPK, .RGSS3A, .PAK, .BIG, .WOTREPLAY, .XXX, .DESC, .P7C, .P7B, .P12, .PFX, .PEM, .CRT, .CER, .DER, .X3F, .SRW, .PEF, .PTX, .R3D, .RW2, .RWL, .RAW, .RAF, .ORF, .NRW, .MRWREF, .MEF, .ERF, .KDC, .DCR, .CR2, .CRW, .BAY, .SR2, .SRF, .ARW, .3FR, .DNG, .CDR, .INDD, .EPS, .PDF, .PDD, .PSD, .DBF, .MDF, .WB2, .RTF, .WPD, .DXG, .DWG, .PST, .ODT, .DXF, .MP3,.MRW, .NEF, .JFIF, .DRF, .BLEND, .APJ, .3DS, .SDA, .PAT, .FXG, .FHD, .DXB, .DRW, .DESIGN, .DDRW, .DDOC, .DCS, .CSL, .CSH, .CPI, .CGM, .CDX, .CDRW, .CDR6, .CDR5, .CDR4, .CDR3, .AWG, .AIT, .AGD1, .YCBCRA, .STX, .ST8, .ST7, .ST6, .ST5, .ST4, .SD1, .SD0, .RWZ, .RA2, .PCD, .NWB, .NOP, .NDD, .MOS, .MFW, .MDC, .KC2, .IIQ, .GRY, .GREY, .GRAY, .FPX, .FFF, .EXF, .DC2, .CRAW, .CMT, .CIB, .CE2, .CE1, .3PR, .MPG, .SQLITEDB, .SQLITE3, .SQLITE, .SDF, .SAS7BDAT, .S3DB, .RDB, .PSAFE3, .NYF, .NX2, .NX1, .NSH, .NSG, .NSF, .NSD, .NS4, .NS3, .NS2, .MYD, .KPDX, .KDBX, .IDX, .IBZ, .IBD, .FDB, .ERBSQL, .DB3, .DB-JOURNAL, .CLS, .BDB, .ADB, .MONEYWELL, .MMW, .HBK, .FFD, .DGC, .DDD, .DAC, .CFP, .CDF, .BPW, .BGT, .ACR, .AC2, .AB4, .DJVU, .SXM, .ODF, .MSG, .STD, .SXD, .OTG, .STI, .SXI, .OTP, .ODG, .STC, .SXC, .OTS, .SXG, .STW, .SXW, .OTH, .OTT
The Ransomware encrypts the first 512 Bytes of the File Header which will render most filetypes useless. It does not leave any Signature in the data of the files and neither does it append a custom extension to the filename.
Another IOC: It creates the following Mutex: 835821AM3218SAZ
This article is Work in Progress, Updates will follow
MITRE ATT&CK
T1179 --> Hooking --> Persistence
T1179 --> Hooking --> Privilege Escalation
T1045 --> Software Packing --> Defense Evasion
T1179 --> Hooking --> Credential Access
T1114 --> Email Collection --> Collection
IOCs
Afrodita
notnice.jpg --> SHA256: 9b6681103545432cd1373492297a6a12528f327d14a7416c2b71cfdcbdafc90b
SSDEEP: 6144:EXrm0zIiAhjC7Cqa5ZhiIJDQ13Xdksm1Cx2tJk:EbNQaCq6iIJcdksmJtJ
Payload Servers
hxxp://riskpartner[.]hr/wp-content/notnice.jpg hxxp://content-delivery[.]in/verynice.jpg
E-Mail Addresses / Contact
[email protected] [email protected] hxxps://t[.]me/RecoverySupport
Ransomnote
~~~ Greetings ~~~[+] What has happened? [+]
Your files are encrypted, and currently unavailable. You are free to check.
Every file is recoverable by following our instructions below.Encryption algorithms used: AES256(CBC) + RSA2048 (military/government grade).
[+] Guarantees? [+]
This is our daily job. We are not here to lie to you - as you are 1 of 10000’s.
Our only interest is in us getting payed and you getting your files back.If we were not able to decrypt the data, other people in same situation as you
wouldn’t trust us and that would be bad for our buissness –
So it’s not in our interest.To prove our ability to decrypt your data you have 1 file free decryption.
If you don’t want to pay the fee for bringing files back that’s okey,
but remeber that you will lose a lot of time - and time is money.Don’t waste your time and money trying to recover files using some file
recovery “experts”, we have your private key - only we can get the files back.With our service you can go back to original state in less then 30 minutes.
[+] Service [+]
If you decided to use our service please follow instructions below.
Contact us:
Install Telegram(available for Windows,Android,iOS) and contact us on chat:
Telegram contact: Telegram: Contact @RecoverySupportAlso available at email [email protected] cc: [email protected]
Make sure you are talking with us and not impostor by requiring free 1 file decryption to make sure we CAN decrypt!!
Title Image by Robert Drózd, modified
Article Link: Not so nice after all - Afrodita Ransomware