64229251028e91c9b3a44e1a13f7fe2cdc036db7d3ef8b943dedb36d4549d3c0

Analysis

max time kernel
162s
max time network
149s
platform
windows7_x64
resource
win7-20231215-en
resource tags

arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
submitted
31/12/2023, 16:45

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General

Target

2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
Size

26.6MB
MD5

5d52e0e5d2e1c2955011dd585f0848ae
SHA1

7da00cb8fac2f21d495111c8754e7cd37f1540f3
SHA256

64229251028e91c9b3a44e1a13f7fe2cdc036db7d3ef8b943dedb36d4549d3c0
SHA512

e254e58aca8625d0cff2f829a49bdea1952c6010edec5a574bdd9cbfa72ecb525ed9fa66a34e0834000e051cf82ae6aa332d8405acb08e1f0eabcee435937887
SSDEEP

98304:9E2RpMMHMMMvMMZMMMlmMMMiMMMYJMMHMMM6MMZMMMqNMMzMMMUMMVMMMYJMMzMr:9nwngnwnC

Score

10^/10

persistence

Malware Config

Signatures

Modifies WinLogon for persistence 2 TTPs 2 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "Explorer.exe HelpMe.exe"	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "Explorer.exe HelpMe.exe"	HelpMe.exe

Drops startup file 3 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Soft.lnk	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Soft.lnk	HelpMe.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Soft.lnk	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe

Executes dropped EXE 1 IoCs

pid	Process
2700	HelpMe.exe

Loads dropped DLL 2 IoCs

pid	Process
2740	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
2740	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe

Enumerates connected drives 3 TTPs 46 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\S:	HelpMe.exe
File opened (read-only)	\??\V:	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
File opened (read-only)	\??\L:	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
File opened (read-only)	\??\M:	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
File opened (read-only)	\??\S:	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
File opened (read-only)	\??\K:	HelpMe.exe
File opened (read-only)	\??\E:	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
File opened (read-only)	\??\G:	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
File opened (read-only)	\??\R:	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
File opened (read-only)	\??\U:	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
File opened (read-only)	\??\P:	HelpMe.exe
File opened (read-only)	\??\Q:	HelpMe.exe
File opened (read-only)	\??\U:	HelpMe.exe
File opened (read-only)	\??\B:	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
File opened (read-only)	\??\T:	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
File opened (read-only)	\??\G:	HelpMe.exe
File opened (read-only)	\??\L:	HelpMe.exe
File opened (read-only)	\??\M:	HelpMe.exe
File opened (read-only)	\??\W:	HelpMe.exe
File opened (read-only)	\??\O:	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
File opened (read-only)	\??\X:	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
File opened (read-only)	\??\A:	HelpMe.exe
File opened (read-only)	\??\H:	HelpMe.exe
File opened (read-only)	\??\I:	HelpMe.exe
File opened (read-only)	\??\N:	HelpMe.exe
File opened (read-only)	\??\A:	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
File opened (read-only)	\??\N:	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
File opened (read-only)	\??\P:	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
File opened (read-only)	\??\Z:	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
File opened (read-only)	\??\E:	HelpMe.exe
File opened (read-only)	\??\O:	HelpMe.exe
File opened (read-only)	\??\V:	HelpMe.exe
File opened (read-only)	\??\J:	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
File opened (read-only)	\??\K:	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
File opened (read-only)	\??\Q:	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
File opened (read-only)	\??\Y:	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
File opened (read-only)	\??\B:	HelpMe.exe
File opened (read-only)	\??\X:	HelpMe.exe
File opened (read-only)	\??\Z:	HelpMe.exe
File opened (read-only)	\??\H:	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
File opened (read-only)	\??\W:	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
File opened (read-only)	\??\J:	HelpMe.exe
File opened (read-only)	\??\R:	HelpMe.exe
File opened (read-only)	\??\T:	HelpMe.exe
File opened (read-only)	\??\Y:	HelpMe.exe
File opened (read-only)	\??\I:	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe

Drops autorun.inf file 1 TTPs 3 IoCs

Malware can abuse Windows Autorun to spread further via attached volumes.

Replication Through Removable Media

T1091

description	ioc	Process
File opened for modification	F:\AUTORUN.INF	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
File opened for modification	C:\AUTORUN.INF	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
File opened for modification	F:\AUTORUN.INF	HelpMe.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\HelpMe.exe	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
File created	C:\Windows\SysWOW64\HelpMe.exe	HelpMe.exe

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

System Information Discovery
T1082

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2740 wrote to memory of 2700	2740	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe	30
PID 2740 wrote to memory of 2700	2740	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe	30
PID 2740 wrote to memory of 2700	2740	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe	30
PID 2740 wrote to memory of 2700	2740	2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe	30

C:\Users\Admin\AppData\Local\Temp\2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe
"C:\Users\Admin\AppData\Local\Temp\2023-12-29_5d52e0e5d2e1c2955011dd585f0848ae_ryuk.exe"
1⤵
- Modifies WinLogon for persistence
- Drops startup file
- Loads dropped DLL
- Enumerates connected drives
- Drops autorun.inf file
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
PID:2740
- C:\Windows\SysWOW64\HelpMe.exe
  C:\Windows\system32\HelpMe.exe
  2⤵
  - Modifies WinLogon for persistence
  - Drops startup file
  - Executes dropped EXE
  - Enumerates connected drives
  - Drops autorun.inf file
  - Drops file in System32 directory
  PID:2700

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Replication Through Removable Media

T1091

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Replication Through Removable Media

T1091

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\$Recycle.Bin\S-1-5-21-452311807-3713411997-1028535425-1000\desktop.ini.exe

Filesize
501KB

MD5
b7d24d5075bfb2fb52838c5fd90c737b

SHA1
a14876045ad43a78a9bc72a5141e09ea17c4eafa

SHA256
707b888c118db2c260d5d16159e23919eaf0a4d7a4166b26794b796ccdea717d

SHA512
e6d76f99e9a592418dd93a49e8e9af4aefdc9d9ba36d079cf9885ad02df923c29e37e90b952145f95db66b4e5e6b32e45d8e4a66f001c20e357ae7e801f85264

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Soft.lnk

Filesize
1KB

MD5
15f5f0ea9e7135eee8d0a5ff377911c9

SHA1
54907ed3ee22eb9b68722e1fb61a497b30de9b67

SHA256
489cc83de30dc35599d4bc25bcb4d6b590860ca23ab4419a214fc11bcffa29b2

SHA512
88a3d002e9a5a6c555b2cd92185db16365c5a93243a2d92a014e2ccd249c606de36283272892288460f2a007976f6eb7092b642e5a438c68512668fd9dadefe2

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Soft.lnk

Filesize
950B

MD5
11ac86bd8e60110e7ee15ab755d492f7

SHA1
538d0dfd3b4f760ad9afbc0f9a7564ccf87470b2

SHA256
1cd659c3978e9e2d12373205e144520c546099d6f18a85f465155934472c753a

SHA512
cb03b79ffee8ded5e196e75355b9b5d5e750fd19f8c766b2b59c2d409f5abfcaaf6bb60e6048bae5642161a46fb996e416c855d82766e7a5355ed4679d3d3ca6

Download Submit
C:\Windows\SysWOW64\HelpMe.exe

Filesize
1.2MB

MD5
3641c8b7ef5dface1ce914404353ef9e

SHA1
186b852d79188fe285a659b97d4ed0f29e8de065

SHA256
61fbba0f94116fa9a9df9bb290d2a0c8fb639118625780a8071f190f4b8eb5ac

SHA512
150968ca2bb4ce6237fdaa67a9c1ffe80bf44434189c960c3ecaa75f5ec14aad07fd12df402409862b26b17f52d297482e310b1c7c00dd970bcd5903a8346482

Download Submit
C:\Windows\SysWOW64\HelpMe.exe

Filesize
925KB

MD5
04e7d2ab22d89b01e39a75b2e07b9839

SHA1
2e517349c79fc6a80014a17554fd3e608e3761b0

SHA256
87fbdf4fd03bd61e47133a1b05fc10fc73d1f356cfa90fe6417dd2caefb59ec2

SHA512
c7e41a8b0cd6ca5b5fd49215657aa30c4cb8d3702139efd9465acd0b136c09faa5c0af9a8f35a815dac586f8d596437e879857b92f3f7358788667db79695fc7

Download Submit
C:\Windows\SysWOW64\HelpMe.exe

Filesize
64KB

MD5
c12c36058eb0c9a2ff4bdb5225cb0066

SHA1
74691427b3e332ba99751c377c792ab09c50b032

SHA256
845967cd05fa3658c710d6b7bcaad6e112ebb88ea3157cc28442d73bfdb2d75c

SHA512
c49e60a80a2ebfeb5ebee3713b70f48ddeb5ac6fa3d4741558174e0a79669b2e963e9bfaa42341dba135533d478c8c3dfa3c513bc8ee4c0b316dc58479106a80

Download Submit
F:\AUTORUN.INF

Filesize
145B

MD5
ca13857b2fd3895a39f09d9dde3cca97

SHA1
8b78c5b2ec97c372ebdcef92d14b0998f8dd6dd0

SHA256
cfe448b4506a95b33b529efa88f1ac704d8bdf98a941c065650ead27609318ae

SHA512
55e5b5325968d1e5314527fb2d26012f5aae4a1c38e305417be273400cb1c6d0c22b85bddb501d7a5720a3f53bb5caf6ada8a7894232344c4f6c6ef85d226b47

Download Submit
F:\AutoRun.exe

Filesize
888KB

MD5
c7380abce22a69d66d75160a9234a30d

SHA1
acd5695b85b1f85d0e4b3c56b6c2368678e87610

SHA256
f78368b9311b40d5698089f0a882c66ed9980c574699ad267189b2d697baa7e2

SHA512
1500a8024e854f6fffe6aa167521b2f024e6e89d0f0197c17cc4f048492253753bb1b5ab17d0c16110323dbf51840887e2c0c9c96ea387328c29719eed90dbfc

Download Submit
\Windows\SysWOW64\HelpMe.exe

Filesize
2.1MB

MD5
6ad2d1426241253f4a5749128e188072

SHA1
31337cca15c458183790c6e2d1c0063ab04e13d0

SHA256
a0a1180e96890af3f04b17a0cac0e25e4e9afadf2ebe28d68772da9aba1171fa

SHA512
f113abda3ee040d8665e425d754dbc92a785e08f5de32ed710b8afc034e2ee0da32b59f544a2f4ccc5e3961e7daa0a89fceb303d2d37f59863d47e5e245ce260

Download Submit
\Windows\SysWOW64\HelpMe.exe

Filesize
641KB

MD5
2f7afbd96c5cf50240f50364f20365c8

SHA1
872f4561ef76f19b9fdc3e4d24d570e409fdd835

SHA256
522379b167253633c4ee72d1969bb6f7dfdbaebda43ce4cc7e708e5e541063d0

SHA512
c3a559848bbb5f7da178c775a31bf3f04df2247c2ecc38c6c4dfeb0e2c90c57ac0358ad2efddb2e7c33e0fe1ea07a93ed9e884c8cbd4546b6d6681c00f5869fc

Download Submit
memory/2700-11-0x0000000000400000-0x000000000047B000-memory.dmp

Filesize
492KB

Download
memory/2700-13-0x00000000001B0000-0x00000000001B1000-memory.dmp

Filesize
4KB

Download
memory/2700-84-0x0000000000400000-0x000000000047B000-memory.dmp

Filesize
492KB

Download
memory/2740-0-0x0000000000400000-0x000000000047B000-memory.dmp

Filesize
492KB

Download
memory/2740-4-0x0000000001F30000-0x0000000001FAB000-memory.dmp

Filesize
492KB

Download
memory/2740-81-0x0000000000400000-0x000000000047B000-memory.dmp

Filesize
492KB

Download
memory/2740-82-0x0000000000220000-0x0000000000221000-memory.dmp

Filesize
4KB

Download
memory/2740-83-0x0000000001F30000-0x0000000001FAB000-memory.dmp

Filesize
492KB

Download
memory/2740-1-0x0000000000220000-0x0000000000221000-memory.dmp

Filesize
4KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads