b5476446d4f5ac386bdd94987323ed71f70de54016ba19ce31e6e46b43e267ce

Analysis

max time kernel
117s
max time network
119s
platform
windows7_x64
resource
win7-20231129-en
resource tags

arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
submitted
08/05/2024, 19:08

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

uninst.exe
Size

400KB
MD5

7ded51e887171a321fd7f5f59925ea42
SHA1

2d2654c5e0c4fb557383842a7de1c2036a2f569c
SHA256

1cb9f1b81e6c5b98feddee92c9d14fff89d4b111b0c0974c6e804d7dfdc36bdb
SHA512

980489325baa4c17d727334076e4228d582afe0884548bc132f4991cca6e96a92605c9b777af0b62162f90a326ee1145d2dcb056fc30390b28d6c9f015138827
SSDEEP

6144:H8LxBH3+tUVHZfKfj+v9ETgRPOILnMLPAiaINBIs/IYlAJA3Tfk6:M+tUT7OKMLPTaINBIs/nAW3Q6

Score

7^/10

bootkit persistence

Malware Config

Signatures

Deletes itself 1 IoCs

pid	Process
2384	Au_.exe

Executes dropped EXE 1 IoCs

pid	Process
2384	Au_.exe

Loads dropped DLL 3 IoCs

pid	Process
2888	uninst.exe
2384	Au_.exe
2384	Au_.exe

Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs

Bootkits write to the MBR to gain persistence at a level below the operating system.

bootkit persistence

Bootkit

T1542.003

description	ioc	Process
File opened for modification	\??\PhysicalDrive0	sz.exe

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

System Information Discovery
T1082

NSIS installer 2 IoCs

installer

resource	yara_rule
behavioral17/files/0x0009000000015018-5.dat	nsis_installer_1
behavioral17/files/0x0009000000015018-5.dat	nsis_installer_2

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2384	Au_.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2384	Au_.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 2888 wrote to memory of 2384	2888	uninst.exe	28
PID 2888 wrote to memory of 2384	2888	uninst.exe	28
PID 2888 wrote to memory of 2384	2888	uninst.exe	28
PID 2888 wrote to memory of 2384	2888	uninst.exe	28
PID 2888 wrote to memory of 2384	2888	uninst.exe	28
PID 2888 wrote to memory of 2384	2888	uninst.exe	28
PID 2888 wrote to memory of 2384	2888	uninst.exe	28
PID 2384 wrote to memory of 2740	2384	Au_.exe	29
PID 2384 wrote to memory of 2740	2384	Au_.exe	29
PID 2384 wrote to memory of 2740	2384	Au_.exe	29
PID 2384 wrote to memory of 2740	2384	Au_.exe	29

C:\Users\Admin\AppData\Local\Temp\uninst.exe
"C:\Users\Admin\AppData\Local\Temp\uninst.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:2888
- C:\Users\Admin\AppData\Local\Temp\~nsuA.tmp\Au_.exe
  "C:\Users\Admin\AppData\Local\Temp\~nsuA.tmp\Au_.exe" _?=C:\Users\Admin\AppData\Local\Temp\
  2⤵
  - Deletes itself
  - Executes dropped EXE
  - Loads dropped DLL
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of WriteProcessMemory
  PID:2384
- - C:\Users\Admin\AppData\Local\Temp\sz.exe
    "C:\Users\Admin\AppData\Local\Temp\sz.exe" /uninstallsucc
    3⤵
    - Writes to the Master Boot Record (MBR)
    PID:2740

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Pre-OS Boot

T1542

Bootkit

T1542.003

Privilege Escalation

Defense Evasion

Pre-OS Boot

T1542

Bootkit

T1542.003

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\~nsuA.tmp\Au_.exe

Filesize
400KB

MD5
7ded51e887171a321fd7f5f59925ea42

SHA1
2d2654c5e0c4fb557383842a7de1c2036a2f569c

SHA256
1cb9f1b81e6c5b98feddee92c9d14fff89d4b111b0c0974c6e804d7dfdc36bdb

SHA512
980489325baa4c17d727334076e4228d582afe0884548bc132f4991cca6e96a92605c9b777af0b62162f90a326ee1145d2dcb056fc30390b28d6c9f015138827

Download Submit
\Users\Admin\AppData\Local\Temp\nsi2675.tmp\FindProcDLL.dll

Filesize
3KB

MD5
8614c450637267afacad1645e23ba24a

SHA1
e7b7b09b5bbc13e910aa36316d9cc5fc5d4dcdc2

SHA256
0fa04f06a6de18d316832086891e9c23ae606d7784d5d5676385839b21ca2758

SHA512
af46cd679097584ff9a1d894a729b6397f4b3af17dff3e6f07bef257bc7e48ffa341d82daf298616cd5df1450fc5ab7435cacb70f27302b6db193f01a9f8391b

Download Submit
\Users\Admin\AppData\Local\Temp\nsi2675.tmp\inetc.dll

Filesize
20KB

MD5
50fdadda3e993688401f6f1108fabdb4

SHA1
04a9ae55d0fb726be49809582cea41d75bf22a9a

SHA256
6d6ddc0d2b7d59eb91be44939457858ced5eb23cf4aa93ef33bb600eb28de6f6

SHA512
e9628870feea8c3aaefe22a2af41cf34b1c1778c4a0e81d069f50553ce1a23f68a0ba74b296420b2be92425d4995a43e51c018c2e8197ec2ec39305e87c56be8

Download Submit
memory/2384-14-0x0000000010000000-0x0000000010003000-memory.dmp

Filesize
12KB

Download