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 10:22

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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

pid	Process
1368	pay.exe

Loads dropped DLL 7 IoCs

pid	Process
360	4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc.exe
360	4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc.exe
360	4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc.exe
360	4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc.exe
608	WerFault.exe
608	WerFault.exe
608	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

pid	pid_target	Process	procid_target
608	1368	WerFault.exe	27

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
1404	AcroRd32.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
1404	AcroRd32.exe
1404	AcroRd32.exe
1404	AcroRd32.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 360 wrote to memory of 1368	360	4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc.exe	27
PID 360 wrote to memory of 1368	360	4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc.exe	27
PID 360 wrote to memory of 1368	360	4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc.exe	27
PID 360 wrote to memory of 1368	360	4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc.exe	27
PID 360 wrote to memory of 1404	360	4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc.exe	28
PID 360 wrote to memory of 1404	360	4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc.exe	28
PID 360 wrote to memory of 1404	360	4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc.exe	28
PID 360 wrote to memory of 1404	360	4ac1f3c7d6751d5f161f82483bbcf27b795d3b205391acbde576094da81badfc.exe	28
PID 1368 wrote to memory of 608	1368	pay.exe	31
PID 1368 wrote to memory of 608	1368	pay.exe	31
PID 1368 wrote to memory of 608	1368	pay.exe	31
PID 1368 wrote to memory of 608	1368	pay.exe	31

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:360
- 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:1368
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 1368 -s 772
    3⤵
    - Loads dropped DLL
    - Program crash
    PID:608
- 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:1404

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\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/360-54-0x0000000075771000-0x0000000075773000-memory.dmp

Filesize
8KB

Download