djvu | d69f5817cc5eadb99b3a8b0f87ca4a471c052f151f14180955f14ad78a1acacc

Analysis

max time kernel
439s
max time network
444s
platform
windows11-21h2_x64
resource
win11-20240221-en
resource tags

arch:x64arch:x86image:win11-20240221-enlocale:en-usos:windows11-21h2-x64system
submitted
27/03/2024, 20:28 UTC

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General

Target

buildz.exe
Size

728KB
MD5

1ac225bc36c31f9209f984210bd68469
SHA1

b43db3c1f19bca6b35e91ee88edf8c80d4e6c422
SHA256

d69f5817cc5eadb99b3a8b0f87ca4a471c052f151f14180955f14ad78a1acacc
SHA512

e99727b0b993b6911b402eb48c85eb81dd10b76894eabaad196618558f643ab6dd2e5c1a5d393e1537b089fdfdbe1d778c88f62fb0abd9384b461521422e53a3
SSDEEP

12288:yCLwobUsKbD6axHJhie99gldRoo+uoagdWip+KSN7uO7/:yYsmaZJwAglLoo+5WioKSN7ue/

Score

10^/10

djvu discovery persistence ransomware

Malware Config

Extracted

Family

djvu

http://sajdfue.com/test1/get.php

Attributes

extension
.vook
offline_id
1eSPzWRaNslCgtjBZfL5pzvovoiaVI4IZSnvAwt1
payload_url
http://sdfjhuz.com/dl/build2.exe

http://sajdfue.com/files/1/build3.exe
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: https://wetransfer.com/downloads/3ed7a617738550b0a00c5aa231c0752020240316170955/d71ce1 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: support@freshingmail.top Reserve e-mail address to contact us: datarestorehelpyou@airmail.cc Your personal ID: 0857PsawqS

rsa_pubkey.plain

1
-----BEGIN PUBLIC KEY-----
2
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtsrZj8ANIaAyJo6Cgf02
3
flR2qhn8muc3Oiz92+/FrUFCEp/U18FNk8Vv5fGIXEg3YG12NymHl0xSSejdzJfI
4
1ffL3otjyS9WYjzkBBWMmiFTkF9E2htboQdRomdEZkqQqydJcyC3cxjQFsFqK93/
5
JYdAjHOYyPlP6NYhgiZSwQ+t+JujZyoFgHnjqltbJEZVx+pry1chXDuTB82Mvssa
6
P5LgyW4Zry3asIgxNkWzZPF5a5ncxMPc81E4iFpec5dDDIgijcJCWBvYFcrfGuMo
7
DqZSlbJ4xNRx36xZhLb5xLJbLyDpGMNTNKrPifl+A/CMVSrjgBKf2uCPwwSImO55
8
TwIDAQAB
9
-----END PUBLIC KEY-----

Signatures

Detected Djvu ransomware 9 IoCs

resource	yara_rule
behavioral4/memory/1048-2-0x0000000002580000-0x000000000269B000-memory.dmp	family_djvu
behavioral4/memory/4544-3-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral4/memory/4544-4-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral4/memory/4544-5-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral4/memory/4544-6-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral4/memory/4544-17-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral4/memory/3560-22-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral4/memory/3560-23-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral4/memory/3560-25-0x0000000000400000-0x0000000000537000-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
4340	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-1-5-21-3084248216-1643706459-906455512-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\c57877d0-39f1-4e18-b7e0-edc0c2a38ef1\\buildz.exe\" --AutoStart"	buildz.exe

Looks up external IP address via web service 2 IoCs

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

flow	ioc
1	api.2ip.ua
2	api.2ip.ua

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1048 set thread context of 4544	1048	buildz.exe	80
PID 4072 set thread context of 3560	4072	buildz.exe	85

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

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3060	3560	WerFault.exe	85

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4544	buildz.exe
4544	buildz.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 1048 wrote to memory of 4544	1048	buildz.exe	80
PID 1048 wrote to memory of 4544	1048	buildz.exe	80
PID 1048 wrote to memory of 4544	1048	buildz.exe	80
PID 1048 wrote to memory of 4544	1048	buildz.exe	80
PID 1048 wrote to memory of 4544	1048	buildz.exe	80
PID 1048 wrote to memory of 4544	1048	buildz.exe	80
PID 1048 wrote to memory of 4544	1048	buildz.exe	80
PID 1048 wrote to memory of 4544	1048	buildz.exe	80
PID 1048 wrote to memory of 4544	1048	buildz.exe	80
PID 1048 wrote to memory of 4544	1048	buildz.exe	80
PID 4544 wrote to memory of 4340	4544	buildz.exe	81
PID 4544 wrote to memory of 4340	4544	buildz.exe	81
PID 4544 wrote to memory of 4340	4544	buildz.exe	81
PID 4544 wrote to memory of 4072	4544	buildz.exe	82
PID 4544 wrote to memory of 4072	4544	buildz.exe	82
PID 4544 wrote to memory of 4072	4544	buildz.exe	82
PID 4072 wrote to memory of 3560	4072	buildz.exe	85
PID 4072 wrote to memory of 3560	4072	buildz.exe	85
PID 4072 wrote to memory of 3560	4072	buildz.exe	85
PID 4072 wrote to memory of 3560	4072	buildz.exe	85
PID 4072 wrote to memory of 3560	4072	buildz.exe	85
PID 4072 wrote to memory of 3560	4072	buildz.exe	85
PID 4072 wrote to memory of 3560	4072	buildz.exe	85
PID 4072 wrote to memory of 3560	4072	buildz.exe	85
PID 4072 wrote to memory of 3560	4072	buildz.exe	85
PID 4072 wrote to memory of 3560	4072	buildz.exe	85

C:\Users\Admin\AppData\Local\Temp\buildz.exe
"C:\Users\Admin\AppData\Local\Temp\buildz.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1048
- C:\Users\Admin\AppData\Local\Temp\buildz.exe
  "C:\Users\Admin\AppData\Local\Temp\buildz.exe"
  2⤵
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:4544
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\c57877d0-39f1-4e18-b7e0-edc0c2a38ef1" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    PID:4340
- - C:\Users\Admin\AppData\Local\Temp\buildz.exe
    "C:\Users\Admin\AppData\Local\Temp\buildz.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:4072
  - - C:\Users\Admin\AppData\Local\Temp\buildz.exe
      "C:\Users\Admin\AppData\Local\Temp\buildz.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      PID:3560
    - - C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 3560 -s 600
        5⤵
        Program crash
        
        PID:3060

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 3560 -ip 3560
1⤵
PID:1776

Network

DNS

api.2ip.ua

buildz.exe

Remote address:

8.8.8.8:53

Request

api.2ip.ua

IN A

Response

api.2ip.ua

IN A

172.67.139.220

api.2ip.ua

IN A

104.21.65.24
DNS

ctldl.windowsupdate.com

buildz.exe

Remote address:

8.8.8.8:53

Request

ctldl.windowsupdate.com

IN A

Response

ctldl.windowsupdate.com

IN CNAME

wu-bg-shim.trafficmanager.net

wu-bg-shim.trafficmanager.net

IN CNAME

download.windowsupdate.com.edgesuite.net

download.windowsupdate.com.edgesuite.net

IN CNAME

a767.dspw65.akamai.net

a767.dspw65.akamai.net

IN A

2.19.117.84

a767.dspw65.akamai.net

IN A

2.19.117.78
DNS

ocsp.pki.goog

buildz.exe

Remote address:

8.8.8.8:53

Request

ocsp.pki.goog

IN A

Response

ocsp.pki.goog

IN CNAME

pki-goog.l.google.com

pki-goog.l.google.com

IN A

142.250.178.3
DNS

8.8.8.8.in-addr.arpa

buildz.exe

Remote address:

8.8.8.8:53

Request

8.8.8.8.in-addr.arpa

IN PTR

Response

8.8.8.8.in-addr.arpa

IN PTR

dnsgoogle
DNS

ctldl.windowsupdate.com

buildz.exe

Remote address:

8.8.8.8:53

Request

ctldl.windowsupdate.com

IN A

Response

ctldl.windowsupdate.com

IN CNAME

wu-bg-shim.trafficmanager.net

wu-bg-shim.trafficmanager.net

IN CNAME

download.windowsupdate.com.edgesuite.net

download.windowsupdate.com.edgesuite.net

IN CNAME

a767.dspw65.akamai.net

a767.dspw65.akamai.net

IN A

2.19.117.78

a767.dspw65.akamai.net

IN A

2.19.117.84
DNS

self.events.data.microsoft.com

buildz.exe

Remote address:

8.8.8.8:53

Request

self.events.data.microsoft.com

IN A

Response

self.events.data.microsoft.com

IN CNAME

self-events-data.trafficmanager.net

self-events-data.trafficmanager.net

IN CNAME

onedscolprdwus17.westus.cloudapp.azure.com

onedscolprdwus17.westus.cloudapp.azure.com

IN A

20.189.173.16
DNS

220.139.67.172.in-addr.arpa

Remote address:

8.8.8.8:53

Request

220.139.67.172.in-addr.arpa

IN PTR

Response
DNS

nexusrules.officeapps.live.com

Remote address:

8.8.8.8:53

Request

nexusrules.officeapps.live.com

IN A

Response

nexusrules.officeapps.live.com

IN CNAME

prod.nexusrules.live.com.akadns.net

prod.nexusrules.live.com.akadns.net

IN A

52.111.227.14
DNS

ocsp.digicert.com

Remote address:

8.8.8.8:53

Request

ocsp.digicert.com

IN A

Response

ocsp.digicert.com

IN CNAME

ocsp.edge.digicert.com

ocsp.edge.digicert.com

IN CNAME

fp2e7a.wpc.2be4.phicdn.net

fp2e7a.wpc.2be4.phicdn.net

IN CNAME

fp2e7a.wpc.phicdn.net

fp2e7a.wpc.phicdn.net

IN A

192.229.221.95
DNS

84.117.19.2.in-addr.arpa

Remote address:

8.8.8.8:53

Request

84.117.19.2.in-addr.arpa

IN PTR

Response

84.117.19.2.in-addr.arpa

IN PTR

a2-19-117-84deploystaticakamaitechnologiescom
DNS

78.117.19.2.in-addr.arpa

Remote address:

8.8.8.8:53

Request

78.117.19.2.in-addr.arpa

IN PTR

Response

78.117.19.2.in-addr.arpa

IN PTR

a2-19-117-78deploystaticakamaitechnologiescom
DNS

16.173.189.20.in-addr.arpa

Remote address:

8.8.8.8:53

Request

16.173.189.20.in-addr.arpa

IN PTR

Response
DNS

3.178.250.142.in-addr.arpa

Remote address:

8.8.8.8:53

Request

3.178.250.142.in-addr.arpa

IN PTR

Response

3.178.250.142.in-addr.arpa

IN PTR

lhr48s27-in-f31e100net
DNS

14.227.111.52.in-addr.arpa

Remote address:

8.8.8.8:53

Request

14.227.111.52.in-addr.arpa

IN PTR

Response
DNS

95.221.229.192.in-addr.arpa

Remote address:

8.8.8.8:53

Request

95.221.229.192.in-addr.arpa

IN PTR

Response

172.67.139.220:443

api.2ip.ua

tls

buildz.exe

1.1kB
8.0kB
14
11

8.8.8.8:53

api.2ip.ua

dns

buildz.exe

395 B
938 B
6
6

DNS Request

api.2ip.ua

DNS Response

172.67.139.220

104.21.65.24

DNS Request

ctldl.windowsupdate.com

DNS Response

2.19.117.84

2.19.117.78

DNS Request

ocsp.pki.goog

DNS Response

142.250.178.3

DNS Request

8.8.8.8.in-addr.arpa

DNS Request

ctldl.windowsupdate.com

DNS Response

2.19.117.78

2.19.117.84

DNS Request

self.events.data.microsoft.com

DNS Response

20.189.173.16
8.8.8.8:53

220.139.67.172.in-addr.arpa

dns

212 B
444 B
3
3

DNS Request

220.139.67.172.in-addr.arpa

DNS Request

nexusrules.officeapps.live.com

DNS Response

52.111.227.14

DNS Request

ocsp.digicert.com

DNS Response

192.229.221.95
8.8.8.8:53

84.117.19.2.in-addr.arpa

dns

212 B
424 B
3
3

DNS Request

84.117.19.2.in-addr.arpa

DNS Request

78.117.19.2.in-addr.arpa

DNS Request

16.173.189.20.in-addr.arpa
8.8.8.8:53

3.178.250.142.in-addr.arpa

dns

217 B
412 B
3
3

DNS Request

3.178.250.142.in-addr.arpa

DNS Request

14.227.111.52.in-addr.arpa

DNS Request

95.221.229.192.in-addr.arpa

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\c57877d0-39f1-4e18-b7e0-edc0c2a38ef1\buildz.exe

Filesize
728KB

MD5
1ac225bc36c31f9209f984210bd68469

SHA1
b43db3c1f19bca6b35e91ee88edf8c80d4e6c422

SHA256
d69f5817cc5eadb99b3a8b0f87ca4a471c052f151f14180955f14ad78a1acacc

SHA512
e99727b0b993b6911b402eb48c85eb81dd10b76894eabaad196618558f643ab6dd2e5c1a5d393e1537b089fdfdbe1d778c88f62fb0abd9384b461521422e53a3

Download Submit
memory/1048-1-0x0000000002410000-0x00000000024B1000-memory.dmp

Filesize
644KB

Download
memory/1048-2-0x0000000002580000-0x000000000269B000-memory.dmp

Filesize
1.1MB

Download
memory/3560-22-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/3560-23-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/3560-25-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4072-20-0x0000000002380000-0x0000000002416000-memory.dmp

Filesize
600KB

Download
memory/4544-3-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4544-4-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4544-5-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4544-6-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4544-17-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

DNS Request

DNS Response

DNS Request

DNS Response

DNS Request

DNS Response

DNS Request

DNS Request

DNS Response

DNS Request

DNS Response

DNS Request

DNS Request

DNS Response

DNS Request

DNS Response

DNS Request

DNS Request

DNS Request

DNS Request

DNS Request

DNS Request

MITRE ATT&CK Enterprise v15

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Downloads

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