djvu | e01c0429a58b33013305aab35ef863cd2b88962e479e39566a687ca37c68510f

Analysis

max time kernel
145s
max time network
121s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
05/10/2024, 14:19

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General

Target
buildz.exe
Size 709KB
Sample241005-rmybbavcqm
SHA256 e01c0429a58b33013305aab35ef863cd2b88962e479e39566a687ca37c68510f
MD5 b7cb7f2b5cd9bd047710650295dc88f7
SHA1 3740ba8e89055cb0f5068ec9176b05c77432e799
SHA512 e6bd45366d067dcc6cdcdc4d917c4e819942caccf22b64a1b1cf45199cdbf58defa0773a8d6a76c0672db2824a724018253efb0db1a0baf0c2f105d07758b471
SSDEEP 12288:9CwgCcyMy1Nncixi2NWXCAcrIQBjljKsFKfFDKZNF:9cCp9KGiAAcUwjljKAK8ZNF
MD5 SHA1 SHA512 SSDEEP

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 13 IoCs

resource	yara_rule
behavioral1/memory/2204-2-0x0000000001DF0000-0x0000000001F0B000-memory.dmp	family_djvu
behavioral1/memory/1720-5-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1720-7-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1720-8-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1720-26-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2140-36-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2140-35-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2140-52-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2140-50-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2140-56-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2140-59-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2140-58-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/2140-60-0x0000000000400000-0x0000000000537000-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
2416	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-1-5-21-3063565911-2056067323-3330884624-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\1a33815c-7277-43f3-89c0-719c66edddbb\\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
4	api.2ip.ua
5	api.2ip.ua
9	api.2ip.ua

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2204 set thread context of 1720	2204	buildz.exe	28
PID 1276 set thread context of 2140	1276	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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	buildz.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1720	buildz.exe
1720	buildz.exe
2140	buildz.exe
2140	buildz.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2204 wrote to memory of 1720	2204	buildz.exe	28
PID 2204 wrote to memory of 1720	2204	buildz.exe	28
PID 2204 wrote to memory of 1720	2204	buildz.exe	28
PID 2204 wrote to memory of 1720	2204	buildz.exe	28
PID 2204 wrote to memory of 1720	2204	buildz.exe	28
PID 2204 wrote to memory of 1720	2204	buildz.exe	28
PID 2204 wrote to memory of 1720	2204	buildz.exe	28
PID 2204 wrote to memory of 1720	2204	buildz.exe	28
PID 2204 wrote to memory of 1720	2204	buildz.exe	28
PID 2204 wrote to memory of 1720	2204	buildz.exe	28
PID 2204 wrote to memory of 1720	2204	buildz.exe	28
PID 1720 wrote to memory of 2416	1720	buildz.exe	30
PID 1720 wrote to memory of 2416	1720	buildz.exe	30
PID 1720 wrote to memory of 2416	1720	buildz.exe	30
PID 1720 wrote to memory of 2416	1720	buildz.exe	30
PID 1720 wrote to memory of 1276	1720	buildz.exe	31
PID 1720 wrote to memory of 1276	1720	buildz.exe	31
PID 1720 wrote to memory of 1276	1720	buildz.exe	31
PID 1720 wrote to memory of 1276	1720	buildz.exe	31
PID 1276 wrote to memory of 2140	1276	buildz.exe	32
PID 1276 wrote to memory of 2140	1276	buildz.exe	32
PID 1276 wrote to memory of 2140	1276	buildz.exe	32
PID 1276 wrote to memory of 2140	1276	buildz.exe	32
PID 1276 wrote to memory of 2140	1276	buildz.exe	32
PID 1276 wrote to memory of 2140	1276	buildz.exe	32
PID 1276 wrote to memory of 2140	1276	buildz.exe	32
PID 1276 wrote to memory of 2140	1276	buildz.exe	32
PID 1276 wrote to memory of 2140	1276	buildz.exe	32
PID 1276 wrote to memory of 2140	1276	buildz.exe	32
PID 1276 wrote to memory of 2140	1276	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:2204
- 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:1720
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\1a33815c-7277-43f3-89c0-719c66edddbb" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    - System Location Discovery: System Language Discovery
    PID:2416
- - 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:1276
  - - 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:2140

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

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Downloads

8B2B9A00839EED1DFDCCC3BFC2F5DF12

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\8B2B9A00839EED1DFDCCC3BFC2F5DF12
Size 1KB
SHA256 33a39e9ec2133230533a686ec43760026e014a3828c703707acbc150fe40fd6f
MD5 7fb5fa1534dcf77f2125b2403b30a0ee
SHA1 365d96812a69ac0a4611ea4b70a3f306576cc3ea
SHA512 a9279fd60505a1bfeef6fb07834cad0fd5be02fd405573fc1a5f59b991e9f88f5e81c32fe910f69bdc6585e71f02559895149eaf49c25b8ff955459fd60c0d2e
MD5 SHA1 SHA512

Submit Download

B46811C17859FFB409CF0E904A4AA8F8

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\B46811C17859FFB409CF0E904A4AA8F8
Size 436B
SHA256 f157ed17fcaf8837fa82f8b69973848c9b10a02636848f995698212a08f31895
MD5 971c514f84bba0785f80aa1c23edfd79
SHA1 732acea710a87530c6b08ecdf32a110d254a54c8
SHA512 43dc1425d80e170c645a3e3bb56da8c3acd31bd637329e9e37094ac346ac85434df4edcdbefc05ae00aea33a80a88e2af695997a495611217fe6706075a63c58
MD5 SHA1 SHA512

Submit Download

8B2B9A00839EED1DFDCCC3BFC2F5DF12

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\8B2B9A00839EED1DFDCCC3BFC2F5DF12
Size 174B
SHA256 6aed2b2ae1f0f7b0a0c248975c0154307b3615d5807fa071f51fb548382a1004
MD5 aa98be1fc9323229e36d7adbfe693c2d
SHA1 be5620d6ddd26b330aec33f617a3be3079b90a2e
SHA512 d6b178d7624f217422cf662186b4b3eab20d854a0bded2a51ea365b25bc4a1ea75138ddea9e936436b66ca953154263a2d62a809b1655aeca6ff8dbd474d5930
MD5 SHA1 SHA512

Submit Download

B46811C17859FFB409CF0E904A4AA8F8

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\B46811C17859FFB409CF0E904A4AA8F8
Size 170B
SHA256 e9613e8250a31b811fb2a039c1aeb5316ab72f2c722139154c0eeb79101381f2
MD5 3374acdb273314ae2aa709dd098a0847
SHA1 aa42d58794e5cda35259af6393362d9cc02abc09
SHA512 8f8833238617b300c64287a7673e6b8ef0c168626bdcf75759ae4aa647bf3af77ad296c3355565dde9d1d24297c641c91d4e4cc393aab260cf95056fc57f369f
MD5 SHA1 SHA512

Submit Download

buildz.exe

Path C:\Users\Admin\AppData\Local\1a33815c-7277-43f3-89c0-719c66edddbb\buildz.exe
Size 709KB
SHA256 e01c0429a58b33013305aab35ef863cd2b88962e479e39566a687ca37c68510f
MD5 b7cb7f2b5cd9bd047710650295dc88f7
SHA1 3740ba8e89055cb0f5068ec9176b05c77432e799
SHA512 e6bd45366d067dcc6cdcdc4d917c4e819942caccf22b64a1b1cf45199cdbf58defa0773a8d6a76c0672db2824a724018253efb0db1a0baf0c2f105d07758b471
SSDEEP 12288:9CwgCcyMy1Nncixi2NWXCAcrIQBjljKsFKfFDKZNF:9cCp9KGiAAcUwjljKAK8ZNF
MD5 SHA1 SHA512 SSDEEP

Submit Download

CabB3D5.tmp

Path C:\Users\Admin\AppData\Local\Temp\CabB3D5.tmp
Size 70KB
SHA256 b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f
MD5 49aebf8cbd62d92ac215b2923fb1b9f5
SHA1 1723be06719828dda65ad804298d0431f6aff976
SHA512 bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b
SSDEEP 1536:gc257bHnClJ3v5mnAQEBP+bfnW8Ctl8G1G4eu76NWDdB34w18R5cBWcJAm68+Q:gp2ld5jPqW8LgeulxB3fgcEfDQ
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/1276-29-0x0000000000400000-0x0000000000541000-memory.dmp

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memory/1276-34-0x0000000000400000-0x0000000000541000-memory.dmp

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memory/1276-28-0x0000000000220000-0x00000000002B2000-memory.dmp

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memory/1720-5-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1720-3-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

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memory/1720-8-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1720-7-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/1720-26-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2140-36-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2140-35-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2140-52-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2140-50-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2140-56-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2140-59-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2140-58-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2140-60-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2204-0-0x0000000000630000-0x00000000006C2000-memory.dmp

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memory/2204-1-0x0000000000630000-0x00000000006C2000-memory.dmp

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memory/2204-2-0x0000000001DF0000-0x0000000001F0B000-memory.dmp

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