djvu | e01c0429a58b33013305aab35ef863cd2b88962e479e39566a687ca37c68510f

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

C2

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

Attributes

extension
.qual
offline_id
KLbRmn6on3AXGFgDLGtd0IkHmV7uHw9VxlcxO5t1
payload_url
ransomnote
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rsa_pubkey.plain

Signatures

Detected Djvu ransomware 16 IoCs

Processes:

resource	yara_rule
behavioral1/memory/4144-2-0x0000000002290000-0x00000000023AB000-memory.dmp	family_djvu
behavioral1/memory/4228-3-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/4228-4-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/4228-5-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/4228-6-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/4228-21-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1760-25-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1760-27-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1760-26-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1760-36-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1760-37-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1760-35-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1760-44-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1760-41-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1760-43-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral1/memory/1760-45-0x0000000000400000-0x0000000000537000-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

Processes:

icacls.exe

pid process

2692 icacls.exe

pid	process
2692	icacls.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

buildz.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-4106386276-4127174233-3637007343-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\33309e88-8d65-4f37-86d3-9d5ccaaa50a6\\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.

Processes:

flow ioc

1 api.2ip.ua
2 api.2ip.ua
10 api.2ip.ua

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

Suspicious use of SetThreadContext 2 IoCs

Processes:

buildz.exebuildz.exe

description	pid	process	target process
PID 4144 set thread context of 4228	4144	buildz.exe	buildz.exe
PID 4116 set thread context of 1760	4116	buildz.exe	buildz.exe

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

Processes:

buildz.exebuildz.exeicacls.exebuildz.exebuildz.exe

description	ioc	process
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	icacls.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

Processes:

buildz.exebuildz.exe

pid process

4228 buildz.exe
4228 buildz.exe
1760 buildz.exe
1760 buildz.exe

pid	process
4228	buildz.exe
4228	buildz.exe
1760	buildz.exe
1760	buildz.exe

Suspicious use of WriteProcessMemory 26 IoCs

Processes:

buildz.exebuildz.exebuildz.exe

description	pid	process	target process
PID 4144 wrote to memory of 4228	4144	buildz.exe	buildz.exe
PID 4144 wrote to memory of 4228	4144	buildz.exe	buildz.exe
PID 4144 wrote to memory of 4228	4144	buildz.exe	buildz.exe
PID 4144 wrote to memory of 4228	4144	buildz.exe	buildz.exe
PID 4144 wrote to memory of 4228	4144	buildz.exe	buildz.exe
PID 4144 wrote to memory of 4228	4144	buildz.exe	buildz.exe
PID 4144 wrote to memory of 4228	4144	buildz.exe	buildz.exe
PID 4144 wrote to memory of 4228	4144	buildz.exe	buildz.exe
PID 4144 wrote to memory of 4228	4144	buildz.exe	buildz.exe
PID 4144 wrote to memory of 4228	4144	buildz.exe	buildz.exe
PID 4228 wrote to memory of 2692	4228	buildz.exe	icacls.exe
PID 4228 wrote to memory of 2692	4228	buildz.exe	icacls.exe
PID 4228 wrote to memory of 2692	4228	buildz.exe	icacls.exe
PID 4228 wrote to memory of 4116	4228	buildz.exe	buildz.exe
PID 4228 wrote to memory of 4116	4228	buildz.exe	buildz.exe
PID 4228 wrote to memory of 4116	4228	buildz.exe	buildz.exe
PID 4116 wrote to memory of 1760	4116	buildz.exe	buildz.exe
PID 4116 wrote to memory of 1760	4116	buildz.exe	buildz.exe
PID 4116 wrote to memory of 1760	4116	buildz.exe	buildz.exe
PID 4116 wrote to memory of 1760	4116	buildz.exe	buildz.exe
PID 4116 wrote to memory of 1760	4116	buildz.exe	buildz.exe
PID 4116 wrote to memory of 1760	4116	buildz.exe	buildz.exe
PID 4116 wrote to memory of 1760	4116	buildz.exe	buildz.exe
PID 4116 wrote to memory of 1760	4116	buildz.exe	buildz.exe
PID 4116 wrote to memory of 1760	4116	buildz.exe	buildz.exe
PID 4116 wrote to memory of 1760	4116	buildz.exe	buildz.exe

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:4144
- 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:4228
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\33309e88-8d65-4f37-86d3-9d5ccaaa50a6" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    - System Location Discovery: System Language Discovery
    PID:2692
- - 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:4116
  - - 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:1760

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

File and Directory Permissions Modification

Modify Registry

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
1KB

MD5
67e486b2f148a3fca863728242b6273e

SHA1
452a84c183d7ea5b7c015b597e94af8eef66d44a

SHA256
facaf1c3a4bf232abce19a2d534e495b0d3adc7dbe3797d336249aa6f70adcfb

SHA512
d3a37da3bb10a9736dc03e8b2b49baceef5d73c026e2077b8ebc1b786f2c9b2f807e0aa13a5866cf3b3cafd2bc506242ef139c423eaffb050bbb87773e53881e

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
bd588a86b81cab0ea9c21186d467116f

SHA1
0b47c5d87712c38274e6b90c053c6d98c163fbbe

SHA256
5a9da88f56df55ca5bf301890d08115c072607ba10828dca4f35b4a9a2c97f43

SHA512
18f1becc1ce9f4e70f4dcecb0d981a06a88f5af1cd8cbb2e77b2c58d3adc2a7561e2d386ca45ad51f0cbfde907b3b41ee3ce7e74d2ff34458c61359c95908eff

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

Filesize
170B

MD5
9fc40719a6de4bd46ea923776cf64505

SHA1
d34d453e3ce7b8848111f1230da4c7cda7628d5f

SHA256
a631ccdf686dd4330dac10d9d4e669938c3a4f81711e25d7f7d476bec502af29

SHA512
2e23b22aa9c67466d99eb27bd2382ea1c7d27ffdccbc527c20d7e916418050556d29441fb1bd74d45086b6ead087082d50c1018b867e1ae0ca66bebac81694a6

Download Submit
C:\Users\Admin\AppData\Local\33309e88-8d65-4f37-86d3-9d5ccaaa50a6\buildz.exe

Filesize
709KB

MD5
b7cb7f2b5cd9bd047710650295dc88f7

SHA1
3740ba8e89055cb0f5068ec9176b05c77432e799

SHA256
e01c0429a58b33013305aab35ef863cd2b88962e479e39566a687ca37c68510f

SHA512
e6bd45366d067dcc6cdcdc4d917c4e819942caccf22b64a1b1cf45199cdbf58defa0773a8d6a76c0672db2824a724018253efb0db1a0baf0c2f105d07758b471

Download Submit
memory/1760-26-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1760-36-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1760-45-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1760-43-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1760-25-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1760-41-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1760-27-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1760-44-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1760-35-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/1760-37-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4116-28-0x0000000000400000-0x0000000000541000-memory.dmp

Filesize
1.3MB

Download
memory/4116-23-0x0000000000400000-0x0000000000541000-memory.dmp

Filesize
1.3MB

Download
memory/4144-2-0x0000000002290000-0x00000000023AB000-memory.dmp

Filesize
1.1MB

Download
memory/4144-1-0x0000000000A50000-0x0000000000AEF000-memory.dmp

Filesize
636KB

Download
memory/4228-3-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4228-4-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4228-5-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4228-6-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download
memory/4228-21-0x0000000000400000-0x0000000000537000-memory.dmp

Filesize
1.2MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads