djvu | e01c0429a58b33013305aab35ef863cd2b88962e479e39566a687ca37c68510f

Analysis

max time kernel
145s
max time network
122s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
05-10-2024 14:28

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

buildz.exe
Size

709KB
MD5

b7cb7f2b5cd9bd047710650295dc88f7
SHA1

3740ba8e89055cb0f5068ec9176b05c77432e799
SHA256

e01c0429a58b33013305aab35ef863cd2b88962e479e39566a687ca37c68510f
SHA512

e6bd45366d067dcc6cdcdc4d917c4e819942caccf22b64a1b1cf45199cdbf58defa0773a8d6a76c0672db2824a724018253efb0db1a0baf0c2f105d07758b471
SSDEEP

12288:9CwgCcyMy1Nncixi2NWXCAcrIQBjljKsFKfFDKZNF:9cCp9KGiAAcUwjljKAK8ZNF

Score

10^/10

djvu discovery persistence ransomware

Malware Config

Extracted

Family

djvu

http://cajgtus.com/lancer/get.php

Attributes

extension
.qual
offline_id
KLbRmn6on3AXGFgDLGtd0IkHmV7uHw9VxlcxO5t1
payload_url
ransomnote
ATTENTION! Don't worry, you can return all your files! All your files like pictures, databases, documents and other important are encrypted with strongest encryption and unique key. The only method of recovering files is to purchase decrypt tool and unique key for you. This software will decrypt all your encrypted files. What guarantees you have? You can send one of your encrypted file from your PC and we decrypt it for free. But we can decrypt only 1 file for free. File must not contain valuable information. Do not ask assistants from youtube and recovery data sites for help in recovering your data. They can use your free decryption quota and scam you. Our contact is emails in this text document only. You can get and look video overview decrypt tool. Price of private key and decrypt software is $999. Discount 50% available if you contact us first 72 hours, that's price for you is $499. Please note that you'll never restore your data without payment. Check your e-mail "Spam" or "Junk" folder if you don't get answer more than 6 hours. To get this software you need write on our e-mail: [email protected] Reserve e-mail address to contact us: [email protected] Your personal ID: 0876qual

rsa_pubkey.plain

Signatures

Detected Djvu ransomware 14 IoCs

resource	yara_rule
behavioral1/memory/2828-5-0x0000000001E00000-0x0000000001F1B000-memory.dmp	family_djvu
behavioral1/memory/2004-4-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2004-8-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2004-9-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2004-25-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2692-34-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2692-35-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2692-47-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2692-48-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2692-49-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2692-55-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2692-56-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2692-53-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2692-57-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu

Djvu Ransomware
Ransomware which is a variant of the STOP family.
ransomware djvu

Modifies file permissions 1 TTPs 1 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
2392	icacls.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3533259084-2542256011-65585152-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\e61c64eb-a67a-4410-85e1-9553791494d1\\buildz.exe\" --AutoStart"	buildz.exe

Looks up external IP address via web service 3 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
9	api.2ip.ua
4	api.2ip.ua
5	api.2ip.ua

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2828 set thread context of 2004	2828	buildz.exe	28
PID 2232 set thread context of 2692	2232	buildz.exe	32

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	buildz.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	icacls.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	buildz.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	buildz.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	buildz.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2004	buildz.exe
2004	buildz.exe
2692	buildz.exe
2692	buildz.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2828 wrote to memory of 2004	2828	buildz.exe	28
PID 2828 wrote to memory of 2004	2828	buildz.exe	28
PID 2828 wrote to memory of 2004	2828	buildz.exe	28
PID 2828 wrote to memory of 2004	2828	buildz.exe	28
PID 2828 wrote to memory of 2004	2828	buildz.exe	28
PID 2828 wrote to memory of 2004	2828	buildz.exe	28
PID 2828 wrote to memory of 2004	2828	buildz.exe	28
PID 2828 wrote to memory of 2004	2828	buildz.exe	28
PID 2828 wrote to memory of 2004	2828	buildz.exe	28
PID 2828 wrote to memory of 2004	2828	buildz.exe	28
PID 2828 wrote to memory of 2004	2828	buildz.exe	28
PID 2004 wrote to memory of 2392	2004	buildz.exe	30
PID 2004 wrote to memory of 2392	2004	buildz.exe	30
PID 2004 wrote to memory of 2392	2004	buildz.exe	30
PID 2004 wrote to memory of 2392	2004	buildz.exe	30
PID 2004 wrote to memory of 2232	2004	buildz.exe	31
PID 2004 wrote to memory of 2232	2004	buildz.exe	31
PID 2004 wrote to memory of 2232	2004	buildz.exe	31
PID 2004 wrote to memory of 2232	2004	buildz.exe	31
PID 2232 wrote to memory of 2692	2232	buildz.exe	32
PID 2232 wrote to memory of 2692	2232	buildz.exe	32
PID 2232 wrote to memory of 2692	2232	buildz.exe	32
PID 2232 wrote to memory of 2692	2232	buildz.exe	32
PID 2232 wrote to memory of 2692	2232	buildz.exe	32
PID 2232 wrote to memory of 2692	2232	buildz.exe	32
PID 2232 wrote to memory of 2692	2232	buildz.exe	32
PID 2232 wrote to memory of 2692	2232	buildz.exe	32
PID 2232 wrote to memory of 2692	2232	buildz.exe	32
PID 2232 wrote to memory of 2692	2232	buildz.exe	32
PID 2232 wrote to memory of 2692	2232	buildz.exe	32

C:\Users\Admin\AppData\Local\Temp\buildz.exe
"C:\Users\Admin\AppData\Local\Temp\buildz.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2828
- C:\Users\Admin\AppData\Local\Temp\buildz.exe
  "C:\Users\Admin\AppData\Local\Temp\buildz.exe"
  2⤵
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:2004
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\e61c64eb-a67a-4410-85e1-9553791494d1" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    - System Location Discovery: System Language Discovery
    PID:2392
- - C:\Users\Admin\AppData\Local\Temp\buildz.exe
    "C:\Users\Admin\AppData\Local\Temp\buildz.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2232
  - - C:\Users\Admin\AppData\Local\Temp\buildz.exe
      "C:\Users\Admin\AppData\Local\Temp\buildz.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      PID:2692

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

File and Directory Permissions Modification

T1222

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\8B2B9A00839EED1DFDCCC3BFC2F5DF12

Filesize
1KB

MD5
7fb5fa1534dcf77f2125b2403b30a0ee

SHA1
365d96812a69ac0a4611ea4b70a3f306576cc3ea

SHA256
33a39e9ec2133230533a686ec43760026e014a3828c703707acbc150fe40fd6f

SHA512
a9279fd60505a1bfeef6fb07834cad0fd5be02fd405573fc1a5f59b991e9f88f5e81c32fe910f69bdc6585e71f02559895149eaf49c25b8ff955459fd60c0d2e

Download Submit
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\B46811C17859FFB409CF0E904A4AA8F8

Filesize
436B

MD5
971c514f84bba0785f80aa1c23edfd79

SHA1
732acea710a87530c6b08ecdf32a110d254a54c8

SHA256
f157ed17fcaf8837fa82f8b69973848c9b10a02636848f995698212a08f31895

SHA512
43dc1425d80e170c645a3e3bb56da8c3acd31bd637329e9e37094ac346ac85434df4edcdbefc05ae00aea33a80a88e2af695997a495611217fe6706075a63c58

Download Submit
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\8B2B9A00839EED1DFDCCC3BFC2F5DF12

Filesize
174B

MD5
79fa2351f0f01ab82ec2938081992ee3

SHA1
f7ef2ff9ce31844e6c28d25828a9e0b15da71780

SHA256
32c0ab967dc73dcec5e9ca4dc0480e81a70340bf88658cf37ebc9b8335af4f98

SHA512
17f8c1345a8b8d7bb39d7fb8b981bb1c257432c26ce94bce0fc6c3bcf47f63b2b00cc6ec9f2e01aff8a820e04376108442803469955d7164fcc7055d7888a711

Download Submit
C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\B46811C17859FFB409CF0E904A4AA8F8

Filesize
170B

MD5
92b099ad3291c7a3b0dd7fa6d904e2f0

SHA1
63e6a21491ed3b4ad5cff38f9b3294166685903f

SHA256
56c288f02a206f7beaa47741d8581f0a8018ccf5d5d5e1ac2663edb311833de4

SHA512
3ce3e26dc89b615cb835da7d1765f7f977b074c40fdfd12b5a21bc4ae1f5ab9eba4ea92a4f8e69519e4db73f55c58159ec096724ba3749449d0126b3782f2083

Download Submit
C:\Users\Admin\AppData\Local\Temp\Cab9FF7.tmp

Filesize
70KB

MD5
49aebf8cbd62d92ac215b2923fb1b9f5

SHA1
1723be06719828dda65ad804298d0431f6aff976

SHA256
b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

SHA512
bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

Download Submit
C:\Users\Admin\AppData\Local\e61c64eb-a67a-4410-85e1-9553791494d1\buildz.exe

Filesize
709KB

MD5
b7cb7f2b5cd9bd047710650295dc88f7

SHA1
3740ba8e89055cb0f5068ec9176b05c77432e799

SHA256
e01c0429a58b33013305aab35ef863cd2b88962e479e39566a687ca37c68510f

SHA512
e6bd45366d067dcc6cdcdc4d917c4e819942caccf22b64a1b1cf45199cdbf58defa0773a8d6a76c0672db2824a724018253efb0db1a0baf0c2f105d07758b471

Download Submit
memory/2004-8-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2004-9-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2004-4-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2004-25-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2004-2-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2232-32-0x0000000000400000-0x0000000000541000-memory.dmp

Filesize
1.3MB

Download
memory/2232-27-0x0000000000220000-0x00000000002B2000-memory.dmp

Filesize
584KB

Download
memory/2232-28-0x0000000000400000-0x0000000000541000-memory.dmp

Filesize
1.3MB

Download
memory/2692-48-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2692-35-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2692-47-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2692-34-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2692-49-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2692-55-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2692-56-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2692-53-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2692-57-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/2828-6-0x0000000000640000-0x00000000006D2000-memory.dmp

Filesize
584KB

Download
memory/2828-1-0x0000000000640000-0x00000000006D2000-memory.dmp

Filesize
584KB

Download
memory/2828-5-0x0000000001E00000-0x0000000001F1B000-memory.dmp

Filesize
1.1MB

Download
memory/2828-0-0x0000000000640000-0x00000000006D2000-memory.dmp

Filesize
584KB

Download