Meet Akira — A new ransomware operation targeting the enterprise

The new Akira ransomware operation has slowly been building a list of victims as they breach corporate networks worldwide, encrypt files, and then demand million-dollar ransoms.

Launched in March 2023, Akira claims to have already conducted attacks on sixteen companies. These companies are in various industries, including education, finance, real estate, manufacturing, and consulting.

While another ransomware named Akira was released in 2017, it is not believed that these operations are related.

The Akira encryptor

A sample of the Akira ransomware was discovered by MalwareHunterTeam, who shared a sample with BleepingComputer so we could analyze it.

When executed, Akira will delete Windows Shadow Volume Copies on the device by running the following PowerShell command:

powershell.exe -Command "Get-WmiObject Win32_Shadowcopy | Remove-WmiObject"

The ransomware will then proceed to encrypt files that contain the following file extensions:

.accdb, .accde, .accdc, .accdt, .accdr, .adb, .accft, .adf, .ade, .arc, .adp, .alf, .ora, .btr, .ask, .cat, .bdf, .ckp, .cdb, .cpd, .cma, .dad, .dacpac, .daschema, .dadiagrams, .db-shm, .db-wal, .dbf, .dbc, .dbt, .dbs, .dbx, .dbv, .dct, .dcb, .ddl, .dcx, .dlis, .dsk, .dqy, .dtsx, .dsn, .eco, .dxl, .edb, .ecx, .exb, .epim, .fdb, .fcd, .fmp, .fic, .fmpsl, .fmp12, .fol, .fpt, .gdb, .frm, .gwi, .grdb, .his, .hdb, .idb, .itdb, .ihx, .jet, .itw, .kdb, .jtx, .kexic, .kexi, .lgc, .kexis, .maf, .lwx, .mar, .maq, .mav, .mas, .mdf, .mdb, .mrg, .mpd, .mwb, .mud, .ndf, .myd, .nrmlib, .nnt, .nsf, .nyf, .nwdb, .oqy, .odb, .owc, .orx, .pdb, .pan, .pnz, .pdm, .qvd, .qry, .rctd, .rbf, .rodx, .rod, .rsd, .rpd, .sbf, .sas7bdat, .sdb, .scx, .sdf, .sdc, .spq, .sis, .sqlite, .sql, .sqlitedb, .sqlite3, .temx, .tps, .tmd, .trm, .trc, .udl, .udb, .usr, .vpd, .vis, .wdb, .vvv, .wrk, .wmdb, .xld, .xdb, .abcddb, .xmlff, .abx, .abs, .adn, .accdw, .icg, .hjt, .kdb, .icr, .maw, .lut, .mdt, .mdn, .vhd, .vdi, .pvm, .vmdk, .vmsn, .vmem, .nvram, .vmsd, .raw, .vmx, .subvol, .qcow2, .vsv, .bin, .vmrs, .avhd, .avdx, .vhdx, .iso, .vmcx

While encrypting, the encryptor will skip files found in the Recycle Bin, System Volume Information, Boot, ProgramData, and Windows folders. It will also avoid encrypting the Windows system files with .exe, .lnk, .dll, .msi, and .sys file extensions.

When encrypting files, the ransomware encrypts files and appends the .akira extension will be appended to the file’s name.

For example, a file named 1.doc would be encrypted and renamed to 1.doc.akira, as shown in the encrypted folder below.

Akira also uses the Windows Restart Manager API to close processes or shut down Windows services that may be keeping a file open and preventing encryption.

Each computer folder will contain a ransom note named akira_readme.txt  that includes information on what happened to a victim’s files and links to the Akira data leak site and negotiation site.

“As for your data, if we fail to agree, we will try to sell personal information/trade secrets/databases/source codes – generally speaking, everything that has a value on the darkmarket – to multiple threat actors at ones. Then all of this will be published in our blog,” threatens the Akira ransom note.

Each victim has a unique negotiation password that is entered into the threat actor’s Tor site. Unlike many other ransomware operations, this negotiation site just includes a chat system that the victim can use to negotiate with the ransomware gang.

Data leak site used to extort victims

Like other ransomware operations, Akira will breach a corporate network and spread laterally to other devices. Once the threat actors gain Windows domain admin credentials, they will deploy the ransomware throughout the network.

However, before encrypting files, the threat actors will steal corporate data for leverage in their extortion attempts, warning victims that it will be publicly released if a ransom is not paid.

The Akira gang put a lot of effort into their data leak site, giving it a retro look where visitors can navigate it by typing in commands, as shown below.

At the time of this writing, Akira has leaked the data for four victims on their data leak site, with the size of the leaked data ranging from 5.9 GB for one company to 259 GB for another.

From negotiations seen by BleepingComputer, the ransomware gang demands ransoms ranging from a $200,000 to millions of dollars.

They are also willing to lower ransom demands for companies who do not need a decryptor, and just want to prevent the leaking of stolen data.

The ransomware is currently being analyzed for weaknesses, and BleepingComputer does not advise victims to pay the ransom until its determined if a free decryptor can recover files for free.

Source: www.bleepingcomputer.com