oski | 4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc

Analysis

max time kernel
149s
max time network
45s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
29-09-2022 10:31

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General

Target

4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc.exe
Size

4.8MB
MD5

e20c33f2403cd0bc0b8cf425586ef01c
SHA1

0d55b0167cffeaaea07493b5ff3b0ca3e54d67c5
SHA256

4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc
SHA512

2308573c4b9277dbcf7cc93511ff9ecbc3340edb20c86772aa0a326e5c6621abc4b770d59e479af55f5ae0f011203b42048d43387eae500da31a85b9831cbb14
SSDEEP

98304:83ReZRsg6m4bZTqS1CGjqc9kfqfVhJaI/M4KBMzWOBfB+sV7q3R2u5I:KUs3mir1CzCSSM4zKI7q4Z

Score

10^/10

oski infostealer spyware stealer

Malware Config

Extracted

Family

oski

rgjeweller.mu/oski/

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
Executes dropped EXE 1 IoCs

Processes:

pay.exe

pid process

1484 pay.exe

pid	process
1484	pay.exe

Loads dropped DLL 7 IoCs

Processes:

4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc.exeWerFault.exe

pid	process
752	4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc.exe
752	4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc.exe
752	4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc.exe
752	4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc.exe
828	WerFault.exe
828	WerFault.exe
828	WerFault.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
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

828 1484 WerFault.exe pay.exe
Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

AcroRd32.exe

pid process

1320 AcroRd32.exe
Suspicious use of SetWindowsHookEx 4 IoCs

Processes:

AcroRd32.exe

pid process

1320 AcroRd32.exe
1320 AcroRd32.exe
1320 AcroRd32.exe
1320 AcroRd32.exe

pid	pid_target	process	target process
828	1484	WerFault.exe	pay.exe

pid	process
1320	AcroRd32.exe

pid	process
1320	AcroRd32.exe
1320	AcroRd32.exe
1320	AcroRd32.exe
1320	AcroRd32.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc.exepay.exe

description	pid	process	target process
PID 752 wrote to memory of 1484	752	4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc.exe	pay.exe
PID 752 wrote to memory of 1484	752	4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc.exe	pay.exe
PID 752 wrote to memory of 1484	752	4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc.exe	pay.exe
PID 752 wrote to memory of 1484	752	4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc.exe	pay.exe
PID 752 wrote to memory of 1320	752	4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc.exe	AcroRd32.exe
PID 752 wrote to memory of 1320	752	4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc.exe	AcroRd32.exe
PID 752 wrote to memory of 1320	752	4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc.exe	AcroRd32.exe
PID 752 wrote to memory of 1320	752	4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc.exe	AcroRd32.exe
PID 1484 wrote to memory of 828	1484	pay.exe	WerFault.exe
PID 1484 wrote to memory of 828	1484	pay.exe	WerFault.exe
PID 1484 wrote to memory of 828	1484	pay.exe	WerFault.exe
PID 1484 wrote to memory of 828	1484	pay.exe	WerFault.exe

C:\Users\Admin\AppData\Local\Temp\4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc.exe
"C:\Users\Admin\AppData\Local\Temp\4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:752

C:\Users\Admin\AppData\Local\Temp\pay.exe
"C:\Users\Admin\AppData\Local\Temp\pay.exe"
2⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:1484

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1484 -s 776
3⤵
- Loads dropped DLL
- Program crash
PID:828

C:\Program Files (x86)\Adobe\Reader 9.0\Reader\AcroRd32.exe
"C:\Program Files (x86)\Adobe\Reader 9.0\Reader\AcroRd32.exe" "C:\Users\Admin\AppData\Local\Temp\pay.pdf"
2⤵
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of SetWindowsHookEx
PID:1320

Network

MITRE ATT&CK Matrix ATT&CK 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

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\pay.exe
Filesize
200KB

MD5
dda0fc7975110e188a92fa9f417766f2

SHA1
aca95b54cd6ae159224f903d1e1c2f58e2206174

SHA256
e872b9dd00f8fd62e837cbba0a6eba7327a69866f04090c2f2402871feb8b8cc

SHA512
aa1ddfa57d900f40fd8199d508bf7c20951ec770f69ba3e5889cf3e1a7a36c8b1289728c35bda247026cd7b81bc5c6decb929291996fe9497285948f7f650a8f

Download Submit
C:\Users\Admin\AppData\Local\Temp\pay.pdf
Filesize
6.8MB

MD5
f6302277c21ecd0563439315f98078c8

SHA1
4f99219add6c11d2d6dcea76cba3e82d9b7233fe

SHA256
ed9f9141d3590513a05fc6117ba4567259713c687e948f45352936ff310b5b51

SHA512
9a509f50da24e20cc24cce4e7a0386aa9104ebc0d34d2f8710722be2319dae2418411b00b9f00eb7ddefa6ea6f90533fa655c947ea331c647f443301f924312e

Download Submit
\Users\Admin\AppData\Local\Temp\pay.exe
Filesize
200KB

MD5
dda0fc7975110e188a92fa9f417766f2

SHA1
aca95b54cd6ae159224f903d1e1c2f58e2206174

SHA256
e872b9dd00f8fd62e837cbba0a6eba7327a69866f04090c2f2402871feb8b8cc

SHA512
aa1ddfa57d900f40fd8199d508bf7c20951ec770f69ba3e5889cf3e1a7a36c8b1289728c35bda247026cd7b81bc5c6decb929291996fe9497285948f7f650a8f

Download Submit
\Users\Admin\AppData\Local\Temp\pay.exe
Filesize
200KB

MD5
dda0fc7975110e188a92fa9f417766f2

SHA1
aca95b54cd6ae159224f903d1e1c2f58e2206174

SHA256
e872b9dd00f8fd62e837cbba0a6eba7327a69866f04090c2f2402871feb8b8cc

SHA512
aa1ddfa57d900f40fd8199d508bf7c20951ec770f69ba3e5889cf3e1a7a36c8b1289728c35bda247026cd7b81bc5c6decb929291996fe9497285948f7f650a8f

Download Submit
\Users\Admin\AppData\Local\Temp\pay.exe
Filesize
200KB

MD5
dda0fc7975110e188a92fa9f417766f2

SHA1
aca95b54cd6ae159224f903d1e1c2f58e2206174

SHA256
e872b9dd00f8fd62e837cbba0a6eba7327a69866f04090c2f2402871feb8b8cc

SHA512
aa1ddfa57d900f40fd8199d508bf7c20951ec770f69ba3e5889cf3e1a7a36c8b1289728c35bda247026cd7b81bc5c6decb929291996fe9497285948f7f650a8f

Download Submit
\Users\Admin\AppData\Local\Temp\pay.exe
Filesize
200KB

MD5
dda0fc7975110e188a92fa9f417766f2

SHA1
aca95b54cd6ae159224f903d1e1c2f58e2206174

SHA256
e872b9dd00f8fd62e837cbba0a6eba7327a69866f04090c2f2402871feb8b8cc

SHA512
aa1ddfa57d900f40fd8199d508bf7c20951ec770f69ba3e5889cf3e1a7a36c8b1289728c35bda247026cd7b81bc5c6decb929291996fe9497285948f7f650a8f

Download Submit
\Users\Admin\AppData\Local\Temp\pay.exe
Filesize
200KB

MD5
dda0fc7975110e188a92fa9f417766f2

SHA1
aca95b54cd6ae159224f903d1e1c2f58e2206174

SHA256
e872b9dd00f8fd62e837cbba0a6eba7327a69866f04090c2f2402871feb8b8cc

SHA512
aa1ddfa57d900f40fd8199d508bf7c20951ec770f69ba3e5889cf3e1a7a36c8b1289728c35bda247026cd7b81bc5c6decb929291996fe9497285948f7f650a8f

Download Submit
\Users\Admin\AppData\Local\Temp\pay.exe
Filesize
200KB

MD5
dda0fc7975110e188a92fa9f417766f2

SHA1
aca95b54cd6ae159224f903d1e1c2f58e2206174

SHA256
e872b9dd00f8fd62e837cbba0a6eba7327a69866f04090c2f2402871feb8b8cc

SHA512
aa1ddfa57d900f40fd8199d508bf7c20951ec770f69ba3e5889cf3e1a7a36c8b1289728c35bda247026cd7b81bc5c6decb929291996fe9497285948f7f650a8f

Download Submit
\Users\Admin\AppData\Local\Temp\pay.exe
Filesize
200KB

MD5
dda0fc7975110e188a92fa9f417766f2

SHA1
aca95b54cd6ae159224f903d1e1c2f58e2206174

SHA256
e872b9dd00f8fd62e837cbba0a6eba7327a69866f04090c2f2402871feb8b8cc

SHA512
aa1ddfa57d900f40fd8199d508bf7c20951ec770f69ba3e5889cf3e1a7a36c8b1289728c35bda247026cd7b81bc5c6decb929291996fe9497285948f7f650a8f

Download Submit
memory/752-54-0x0000000075241000-0x0000000075243000-memory.dmp

Filesize
8KB

Download
memory/828-65-0x0000000000000000-mapping.dmp

Download
memory/1320-61-0x0000000000000000-mapping.dmp

Download
memory/1484-59-0x0000000000000000-mapping.dmp

Download