b480c87b61c8af8b3141af262d0b82aad50aa21cf0f003089fa58dd49eef856b

Analysis

max time kernel
119s
max time network
121s
platform
windows7_x64
resource
win7-20240215-en
resource tags

arch:x64arch:x86image:win7-20240215-enlocale:en-usos:windows7-x64system
submitted
02/05/2024, 05:22

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General

Target

uninst.exe
Size

411KB
MD5

eed224b06b137883dd287f5ba3c5b1c1
SHA1

7bd25580f8b0a3b452d231845a0875fb8876b202
SHA256

7fe1a811dd6aec61ba28cf24aeabe1413576a347bcca7e21356791554312796b
SHA512

3f7e52ffecb0861eac288c3882f8e5743370a4ce87b9f51372151294e0810f39576e81fd5e10c0bcbef232c4088e744196f59284e71523ad15b62157d4eb3cb4
SSDEEP

6144:z8LxBJHR5mV1TiyuqnODoRPdpfOWt1YllqBAI6Ui54Ppb7TwI570CkZq:8x5OTiOOD6dp/AlkAm4KpDwIiZq

Score

7^/10

bootkit persistence

Malware Config

Signatures

Deletes itself 1 IoCs

pid	Process
2936	Au_.exe

Executes dropped EXE 1 IoCs

pid	Process
2936	Au_.exe

Loads dropped DLL 3 IoCs

pid	Process
1844	uninst.exe
2936	Au_.exe
2936	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	cjzg.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
behavioral21/files/0x0030000000016cb2-2.dat	nsis_installer_1
behavioral21/files/0x0030000000016cb2-2.dat	nsis_installer_2

Suspicious behavior: EnumeratesProcesses 12 IoCs

pid	Process
2936	Au_.exe
2624	cjzg.exe
2624	cjzg.exe
2624	cjzg.exe
2624	cjzg.exe
2624	cjzg.exe
2624	cjzg.exe
2624	cjzg.exe
2624	cjzg.exe
2624	cjzg.exe
2624	cjzg.exe
2624	cjzg.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2936	Au_.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 1844 wrote to memory of 2936	1844	uninst.exe	28
PID 1844 wrote to memory of 2936	1844	uninst.exe	28
PID 1844 wrote to memory of 2936	1844	uninst.exe	28
PID 1844 wrote to memory of 2936	1844	uninst.exe	28
PID 1844 wrote to memory of 2936	1844	uninst.exe	28
PID 1844 wrote to memory of 2936	1844	uninst.exe	28
PID 1844 wrote to memory of 2936	1844	uninst.exe	28
PID 2936 wrote to memory of 2624	2936	Au_.exe	30
PID 2936 wrote to memory of 2624	2936	Au_.exe	30
PID 2936 wrote to memory of 2624	2936	Au_.exe	30
PID 2936 wrote to memory of 2624	2936	Au_.exe	30

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:1844
- 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:2936
- - C:\Users\Admin\AppData\Local\Temp\cjzg.exe
    "C:\Users\Admin\AppData\Local\Temp\cjzg.exe" /uninstallsucc
    3⤵
    - Writes to the Master Boot Record (MBR)
    - Suspicious behavior: EnumeratesProcesses
    PID:2624

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\config.ini

Filesize
406B

MD5
b05e49588258e6a954ff72ed5509e87a

SHA1
589e12c2c7b9ead2c4807210de83b24a205f8133

SHA256
eacbac140d0f5618d8f5126e761890b33e062055de73ec1acca7fe7278b147a2

SHA512
18b65a5c561e698041a291f048b03a57296af111a4d4bf4c7d0c423a906757100cac0acff0a19a6038abadc45790ba365424e7cb39e26b11fcf0f659c14ef5c6

Download Submit
\Users\Admin\AppData\Local\Temp\nsd3850.tmp\FindProcDLL.dll

Filesize
3KB

MD5
8614c450637267afacad1645e23ba24a

SHA1
e7b7b09b5bbc13e910aa36316d9cc5fc5d4dcdc2

SHA256
0fa04f06a6de18d316832086891e9c23ae606d7784d5d5676385839b21ca2758

SHA512
af46cd679097584ff9a1d894a729b6397f4b3af17dff3e6f07bef257bc7e48ffa341d82daf298616cd5df1450fc5ab7435cacb70f27302b6db193f01a9f8391b

Download Submit
\Users\Admin\AppData\Local\Temp\nsd3850.tmp\inetc.dll

Filesize
20KB

MD5
50fdadda3e993688401f6f1108fabdb4

SHA1
04a9ae55d0fb726be49809582cea41d75bf22a9a

SHA256
6d6ddc0d2b7d59eb91be44939457858ced5eb23cf4aa93ef33bb600eb28de6f6

SHA512
e9628870feea8c3aaefe22a2af41cf34b1c1778c4a0e81d069f50553ce1a23f68a0ba74b296420b2be92425d4995a43e51c018c2e8197ec2ec39305e87c56be8

Download Submit
\Users\Admin\AppData\Local\Temp\~nsuA.tmp\Au_.exe

Filesize
411KB

MD5
eed224b06b137883dd287f5ba3c5b1c1

SHA1
7bd25580f8b0a3b452d231845a0875fb8876b202

SHA256
7fe1a811dd6aec61ba28cf24aeabe1413576a347bcca7e21356791554312796b

SHA512
3f7e52ffecb0861eac288c3882f8e5743370a4ce87b9f51372151294e0810f39576e81fd5e10c0bcbef232c4088e744196f59284e71523ad15b62157d4eb3cb4

Download Submit
memory/2936-12-0x0000000010000000-0x0000000010003000-memory.dmp

Filesize
12KB

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