535ff53a4eb8cedab53d3368e7c5617ebb4ecb3b0fcc3f931196cf78c028f029

Analysis

max time kernel
88s
max time network
141s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
04-02-2023 04:42

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General

Target

Firefox Installer.exe
Size

342KB
MD5

699773f1df85496dfcf08df647e57a91
SHA1

15b0e3ef49e5e1017c671d0a545d957637dcfa25
SHA256

535ff53a4eb8cedab53d3368e7c5617ebb4ecb3b0fcc3f931196cf78c028f029
SHA512

c6655ab0f2c1c1fd25444abda4039da4ea093d36ba212c95566a6a55125446b0a8f3e4ff331191508ed9fa45ffa6176763122b7c8f270fb438592557c6f0aaf5
SSDEEP

6144:7aVWdyzOxeA1DfdwX3MmIOwB5dVow28rYv0dWPDRRAZKlsyQYUEj/ton5BNS3:7MROxdDfOnMmXiVR2EWPDRRAZKlsqj1l

Score

7^/10

spyware stealer upx

Malware Config

Signatures

Executes dropped EXE 1 IoCs

pid	Process
4056	setup-stub.exe

Loads dropped DLL 7 IoCs

pid	Process
4056	setup-stub.exe
4056	setup-stub.exe
4056	setup-stub.exe
4056	setup-stub.exe
4056	setup-stub.exe
4056	setup-stub.exe
4056	setup-stub.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081

UPX packed file 2 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/4712-132-0x0000000000400000-0x0000000000446000-memory.dmp	upx
behavioral2/memory/4712-143-0x0000000000400000-0x0000000000446000-memory.dmp	upx

Drops file in Program Files directory 6 IoCs

description	ioc	Process
File opened for modification	C:\Program Files\Mozilla Firefox\nsi6902.tmp\	setup-stub.exe
File opened for modification	C:\Program Files\Mozilla Firefox\nsx6913.tmp	setup-stub.exe
File opened for modification	C:\Program Files\Mozilla Firefox\nsx6914.tmp	setup-stub.exe
File opened for modification	C:\Program Files\Mozilla Firefox\nsx6913.tmp\	setup-stub.exe
File opened for modification	C:\Program Files\Mozilla Firefox\nsi6902.tmp	setup-stub.exe
File opened for modification	C:\Program Files\Mozilla Firefox\nsx6912.tmp	setup-stub.exe

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

System Information Discovery
T1082

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4056	setup-stub.exe
4056	setup-stub.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 4712 wrote to memory of 4056	4712	Firefox Installer.exe	81
PID 4712 wrote to memory of 4056	4712	Firefox Installer.exe	81
PID 4712 wrote to memory of 4056	4712	Firefox Installer.exe	81

C:\Users\Admin\AppData\Local\Temp\Firefox Installer.exe
"C:\Users\Admin\AppData\Local\Temp\Firefox Installer.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4712
- C:\Users\Admin\AppData\Local\Temp\7zS8622E926\setup-stub.exe
  .\setup-stub.exe
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of SetWindowsHookEx
  PID:4056

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

T1081

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\7zS8622E926\setup-stub.exe

Filesize
551KB

MD5
32a1e51d0af50d523c4d8815bed5d2ef

SHA1
ae137d93c4f187f76edff03084b88c584b6db0be

SHA256
9da4ea89303bbf57576eb9bb0a817532976dabb404b43c0fb9e3ad052f5ddec3

SHA512
dcdfa931b94868c5dc5b93b0f269cc8093830436bee1a6cd7e1a5bf0c933e58df6426636162b51de8c416ecbeea696f142540f26acde130410242ab464486894

Download Submit
C:\Users\Admin\AppData\Local\Temp\7zS8622E926\setup-stub.exe

Filesize
551KB

MD5
32a1e51d0af50d523c4d8815bed5d2ef

SHA1
ae137d93c4f187f76edff03084b88c584b6db0be

SHA256
9da4ea89303bbf57576eb9bb0a817532976dabb404b43c0fb9e3ad052f5ddec3

SHA512
dcdfa931b94868c5dc5b93b0f269cc8093830436bee1a6cd7e1a5bf0c933e58df6426636162b51de8c416ecbeea696f142540f26acde130410242ab464486894

Download Submit
C:\Users\Admin\AppData\Local\Temp\nss68A3.tmp\CityHash.dll

Filesize
53KB

MD5
2021acc65fa998daa98131e20c4605be

SHA1
2e8407cfe3b1a9d839ea391cfc423e8df8d8a390

SHA256
c299a0a71bf57eb241868158b4fcfe839d15d5ba607e1bdc5499fdf67b334a14

SHA512
cb96d3547bab778cbe94076be6765ed2ae07e183e4888d6c380f240b8c6708662a3b2b6b2294e38c48bc91bf2cc5fc7cfcd3afe63775151ba2fe34b06ce38948

Download Submit
C:\Users\Admin\AppData\Local\Temp\nss68A3.tmp\InetBgDL.dll

Filesize
17KB

MD5
97c607f5d0add72295f8d0f27b448037

SHA1
dfb9a1aa1d3b1f7821152afaac149cad38c8ce3c

SHA256
dc98ed352476af459c91100b8c29073988da19d3adc73e2c2086d25f238544a5

SHA512
ad759062152869089558389c741876029198c5b98fa725e2d2927866dc8b416ae2de871cb2479f614f6d29b6f646bf7191d02837c3cabc15b8185b563bc46268

Download Submit
C:\Users\Admin\AppData\Local\Temp\nss68A3.tmp\System.dll

Filesize
22KB

MD5
b361682fa5e6a1906e754cfa08aa8d90

SHA1
c6701aee0c866565de1b7c1f81fd88da56b395d3

SHA256
b711c4f17690421c9dc8ddb9ed5a9ddc539b3a28f11e19c851e25dcfc7701c04

SHA512
2778f91c9bcf83277d26c71118a1ccb0fb3ce50e89729f14f4915bc65dd48503a77b1e5118ce774dea72f5ce3cc8681eb9ca3c55cf90e9f61a177101ba192ae9

Download Submit
C:\Users\Admin\AppData\Local\Temp\nss68A3.tmp\UAC.dll

Filesize
28KB

MD5
d23b256e9c12fe37d984bae5017c5f8c

SHA1
fd698b58a563816b2260bbc50d7f864b33523121

SHA256
ec6a56d981892bf251df1439bea425a5f6c7e1c7312d44bedd5e2957f270338c

SHA512
13f284821324ffaeadafd3651f64d896186f47cf9a68735642cf37b37de777dba197067fbccd3a7411b5dc7976e510439253bd24c9be1d36c0a59d924c17ae8e

Download Submit
C:\Users\Admin\AppData\Local\Temp\nss68A3.tmp\UserInfo.dll

Filesize
14KB

MD5
610ad03dec634768cd91c7ed79672d67

SHA1
dc8099d476e2b324c09db95059ec5fd3febe1e1e

SHA256
c6c413108539f141bea3f679e0e2ef705898c51ec7c2607f478a865fc5e2e2df

SHA512
18c3c92be81aadfa73884fe3bdf1fce96ccfbd35057600ef52788a871de293b64f677351ba2885c6e9ce5c3890c22471c92832ffc13ba544e9d0b347c5d33bfd

Download Submit
C:\Users\Admin\AppData\Local\Temp\nss68A3.tmp\UserInfo.dll

Filesize
14KB

MD5
610ad03dec634768cd91c7ed79672d67

SHA1
dc8099d476e2b324c09db95059ec5fd3febe1e1e

SHA256
c6c413108539f141bea3f679e0e2ef705898c51ec7c2607f478a865fc5e2e2df

SHA512
18c3c92be81aadfa73884fe3bdf1fce96ccfbd35057600ef52788a871de293b64f677351ba2885c6e9ce5c3890c22471c92832ffc13ba544e9d0b347c5d33bfd

Download Submit
C:\Users\Admin\AppData\Local\Temp\nss68A3.tmp\WebBrowser.dll

Filesize
103KB

MD5
b53cd4ad8562a11f3f7c7890a09df27a

SHA1
db66b94670d47c7ee436c2a5481110ed4f013a48

SHA256
281a0dc8b4f644334c2283897963b20df88fa9fd32acca98ed2856b23318e6ec

SHA512
bb45d93ed13df24a2056040c219cdf36ee44c8cddb7e178fdaabcec63ac965e07f679ca1fa42591bba571992af619aa1dc76e819a7901709df79598a2b0cef81

Download Submit
memory/4712-132-0x0000000000400000-0x0000000000446000-memory.dmp

Filesize
280KB

Download
memory/4712-143-0x0000000000400000-0x0000000000446000-memory.dmp

Filesize
280KB

Download