oski | e33c87beec2f985630825a38da83fefa75e3ce178e2a702d4f419cf32f99450e

Analysis

max time kernel
103s
max time network
77s
platform
windows7_x64
resource
win7v20210408
submitted
20-04-2021 05:40

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

PO_60360570.doc
Size

1.1MB
MD5

e4a5e953841f2f5c61b373dd2a4494e9
SHA1

1dec8d12cac28ab21f1f470f179de4046e41bb2e
SHA256

e33c87beec2f985630825a38da83fefa75e3ce178e2a702d4f419cf32f99450e
SHA512

931db856ef234a4c40c8ba9b0c03d6eaf4e5203c3d1cf7e3af1cb7ed12b06a880c86956a7e04814905ae13fc84750031ee57809cad390847b66f37f62131aeb0

Score

10^/10

oski discovery infostealer persistence spyware stealer

Malware Config

Extracted

Family

oski

osiq.club

Signatures

Oski
Oski is an infostealer targeting browser data, crypto wallets.
infostealer oski
Blocklisted process makes network request 2 IoCs

Processes:

EQNEDT32.EXE

flow pid process

5 1188 EQNEDT32.EXE
7 1188 EQNEDT32.EXE
Downloads MZ/PE file
Executes dropped EXE 2 IoCs

Processes:

69577.exe69577.exe

pid process

1572 69577.exe
1148 69577.exe
Loads dropped DLL 7 IoCs

Processes:

EQNEDT32.EXE69577.exe69577.exe

pid process

1188 EQNEDT32.EXE
1572 69577.exe
1148 69577.exe
1148 69577.exe
1148 69577.exe
1148 69577.exe
1148 69577.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
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials in Files
T1081

flow	pid	process
5	1188	EQNEDT32.EXE
7	1188	EQNEDT32.EXE

pid	process
1572	69577.exe
1148	69577.exe

pid	process
1188	EQNEDT32.EXE
1572	69577.exe
1148	69577.exe
1148	69577.exe
1148	69577.exe
1148	69577.exe
1148	69577.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

69577.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Windows\CurrentVersion\Run\note = "\"C:\\Users\\Admin\\AppData\\Local\\note.exe\""	69577.exe

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012
Suspicious use of SetThreadContext 1 IoCs

Processes:

69577.exe

description pid process target process

PID 1572 set thread context of 1148 1572 69577.exe 69577.exe
Drops file in Windows directory 1 IoCs

Processes:

WINWORD.EXE

description ioc process

File opened for modification C:\Windows\Debug\WIA\wiatrace.log WINWORD.EXE
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Office loads VBA resources, possible macro or embedded object present
Checks processor information in registry 2 TTPs 1 IoCs
Processor information is often read in order to detect sandboxing environments.

Query Registry
T1012

System Information Discovery
T1082

Processes:

69577.exe

description ioc process

Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString 69577.exe
Kills process with taskkill 1 IoCs
evasion

Processes:

taskkill.exe

pid process

1992 taskkill.exe
Launches Equation Editor 1 TTPs 1 IoCs
Equation Editor is an old Office component often targeted by exploits such as CVE-2017-11882.
exploit

Exploitation for Client Execution
T1203

Processes:

EQNEDT32.EXE

pid process

1188 EQNEDT32.EXE

description	pid	process	target process
PID 1572 set thread context of 1148	1572	69577.exe	69577.exe

description	ioc	process
File opened for modification	C:\Windows\Debug\WIA\wiatrace.log	WINWORD.EXE

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	69577.exe

pid	process
1992	taskkill.exe

pid	process
1188	EQNEDT32.EXE

Modifies Internet Explorer settings 1 TTPs 9 IoCs

adware spyware

Modify Registry

T1112

Processes:

WINWORD.EXE

description	ioc	process
Set value (int)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\Contexts = "1"	WINWORD.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes"	WINWORD.EXE
Key created	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt	WINWORD.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\ONBttnIE.dll/105"	WINWORD.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\Contexts = "55"	WINWORD.EXE
Key created	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel	WINWORD.EXE
Key created	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\Toolbar	WINWORD.EXE
Key created	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote	WINWORD.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\EXCEL.EXE/3000"	WINWORD.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

WINWORD.EXE

pid process

1768 WINWORD.EXE
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

69577.exe

pid process

1572 69577.exe
1572 69577.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

69577.exetaskkill.exe

description pid process

Token: SeDebugPrivilege 1572 69577.exe
Token: SeDebugPrivilege 1992 taskkill.exe
Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

WINWORD.EXE

pid process

1768 WINWORD.EXE
1768 WINWORD.EXE

pid	process
1768	WINWORD.EXE

pid	process
1572	69577.exe
1572	69577.exe

description	pid	process
Token: SeDebugPrivilege	1572	69577.exe
Token: SeDebugPrivilege	1992	taskkill.exe

pid	process
1768	WINWORD.EXE
1768	WINWORD.EXE

Suspicious use of WriteProcessMemory 26 IoCs

Processes:

WINWORD.EXEEQNEDT32.EXE69577.exe69577.execmd.exe

description	pid	process	target process
PID 1768 wrote to memory of 2008	1768	WINWORD.EXE	splwow64.exe
PID 1768 wrote to memory of 2008	1768	WINWORD.EXE	splwow64.exe
PID 1768 wrote to memory of 2008	1768	WINWORD.EXE	splwow64.exe
PID 1768 wrote to memory of 2008	1768	WINWORD.EXE	splwow64.exe
PID 1188 wrote to memory of 1572	1188	EQNEDT32.EXE	69577.exe
PID 1188 wrote to memory of 1572	1188	EQNEDT32.EXE	69577.exe
PID 1188 wrote to memory of 1572	1188	EQNEDT32.EXE	69577.exe
PID 1188 wrote to memory of 1572	1188	EQNEDT32.EXE	69577.exe
PID 1572 wrote to memory of 1148	1572	69577.exe	69577.exe
PID 1572 wrote to memory of 1148	1572	69577.exe	69577.exe
PID 1572 wrote to memory of 1148	1572	69577.exe	69577.exe
PID 1572 wrote to memory of 1148	1572	69577.exe	69577.exe
PID 1572 wrote to memory of 1148	1572	69577.exe	69577.exe
PID 1572 wrote to memory of 1148	1572	69577.exe	69577.exe
PID 1572 wrote to memory of 1148	1572	69577.exe	69577.exe
PID 1572 wrote to memory of 1148	1572	69577.exe	69577.exe
PID 1572 wrote to memory of 1148	1572	69577.exe	69577.exe
PID 1572 wrote to memory of 1148	1572	69577.exe	69577.exe
PID 1148 wrote to memory of 1564	1148	69577.exe	cmd.exe
PID 1148 wrote to memory of 1564	1148	69577.exe	cmd.exe
PID 1148 wrote to memory of 1564	1148	69577.exe	cmd.exe
PID 1148 wrote to memory of 1564	1148	69577.exe	cmd.exe
PID 1564 wrote to memory of 1992	1564	cmd.exe	taskkill.exe
PID 1564 wrote to memory of 1992	1564	cmd.exe	taskkill.exe
PID 1564 wrote to memory of 1992	1564	cmd.exe	taskkill.exe
PID 1564 wrote to memory of 1992	1564	cmd.exe	taskkill.exe

C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE
"C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE" /n "C:\Users\Admin\AppData\Local\Temp\PO_60360570.doc"
1⤵
- Drops file in Windows directory
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1768

C:\Windows\splwow64.exe
C:\Windows\splwow64.exe 12288
2⤵
PID:2008

C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE
"C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE" -Embedding
1⤵
- Blocklisted process makes network request
- Loads dropped DLL
- Launches Equation Editor
- Suspicious use of WriteProcessMemory
PID:1188

C:\Users\Public\69577.exe
"C:\Users\Public\69577.exe"
2⤵
- Executes dropped EXE
- Loads dropped DLL
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1572

C:\Users\Admin\AppData\Local\Temp\69577.exe
C:\Users\Admin\AppData\Local\Temp\69577.exe
3⤵
- Executes dropped EXE
- Loads dropped DLL
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
PID:1148

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c taskkill /pid 1148 & erase C:\Users\Admin\AppData\Local\Temp\69577.exe & RD /S /Q C:\\ProgramData\\220101128199902\\* & exit
4⤵
- Suspicious use of WriteProcessMemory
PID:1564

C:\Windows\SysWOW64\taskkill.exe
taskkill /pid 1148
5⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:1992

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Exploitation for Client Execution

T1203

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Credentials in Files

T1081

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Exfiltration

Command and Control

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\69577.exe
MD5
542f3ea693d61187bd10db0376a6b3e7

SHA1
92409ffc8c6ea0ae55a76b6b15616f75174dba97

SHA256
614ea8187654128fc27a51455ab3c8fdbb6d398382cd4d825cf795dbbf5d7966

SHA512
cb383f540285ceb9232a4cc807b5287c4145f6c62fbf961385ef97a68034cc07c37337a595c403dbfe073ad0eac39ce765d58914856051a4c413d6ee5dbc4fb1

Download Submit
C:\Users\Admin\AppData\Local\Temp\69577.exe
MD5
542f3ea693d61187bd10db0376a6b3e7

SHA1
92409ffc8c6ea0ae55a76b6b15616f75174dba97

SHA256
614ea8187654128fc27a51455ab3c8fdbb6d398382cd4d825cf795dbbf5d7966

SHA512
cb383f540285ceb9232a4cc807b5287c4145f6c62fbf961385ef97a68034cc07c37337a595c403dbfe073ad0eac39ce765d58914856051a4c413d6ee5dbc4fb1

Download Submit
C:\Users\Public\69577.exe
MD5
542f3ea693d61187bd10db0376a6b3e7

SHA1
92409ffc8c6ea0ae55a76b6b15616f75174dba97

SHA256
614ea8187654128fc27a51455ab3c8fdbb6d398382cd4d825cf795dbbf5d7966

SHA512
cb383f540285ceb9232a4cc807b5287c4145f6c62fbf961385ef97a68034cc07c37337a595c403dbfe073ad0eac39ce765d58914856051a4c413d6ee5dbc4fb1

Download Submit
C:\Users\Public\69577.exe
MD5
542f3ea693d61187bd10db0376a6b3e7

SHA1
92409ffc8c6ea0ae55a76b6b15616f75174dba97

SHA256
614ea8187654128fc27a51455ab3c8fdbb6d398382cd4d825cf795dbbf5d7966

SHA512
cb383f540285ceb9232a4cc807b5287c4145f6c62fbf961385ef97a68034cc07c37337a595c403dbfe073ad0eac39ce765d58914856051a4c413d6ee5dbc4fb1

Download Submit
\ProgramData\mozglue.dll
MD5
8f73c08a9660691143661bf7332c3c27

SHA1
37fa65dd737c50fda710fdbde89e51374d0c204a

SHA256
3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd

SHA512
0042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89

Download Submit
\ProgramData\msvcp140.dll
MD5
109f0f02fd37c84bfc7508d4227d7ed5

SHA1
ef7420141bb15ac334d3964082361a460bfdb975

SHA256
334e69ac9367f708ce601a6f490ff227d6c20636da5222f148b25831d22e13d4

SHA512
46eb62b65817365c249b48863d894b4669e20fcb3992e747cd5c9fdd57968e1b2cf7418d1c9340a89865eadda362b8db51947eb4427412eb83b35994f932fd39

Download Submit
\ProgramData\nss3.dll
MD5
bfac4e3c5908856ba17d41edcd455a51

SHA1
8eec7e888767aa9e4cca8ff246eb2aacb9170428

SHA256
e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78

SHA512
2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66

Download Submit
\ProgramData\sqlite3.dll
MD5
e477a96c8f2b18d6b5c27bde49c990bf

SHA1
e980c9bf41330d1e5bd04556db4646a0210f7409

SHA256
16574f51785b0e2fc29c2c61477eb47bb39f714829999511dc8952b43ab17660

SHA512
335a86268e7c0e568b1c30981ec644e6cd332e66f96d2551b58a82515316693c1859d87b4f4b7310cf1ac386cee671580fdd999c3bcb23acf2c2282c01c8798c

Download Submit
\ProgramData\vcruntime140.dll
MD5
7587bf9cb4147022cd5681b015183046

SHA1
f2106306a8f6f0da5afb7fc765cfa0757ad5a628

SHA256
c40bb03199a2054dabfc7a8e01d6098e91de7193619effbd0f142a7bf031c14d

SHA512
0b63e4979846ceba1b1ed8470432ea6aa18cca66b5f5322d17b14bc0dfa4b2ee09ca300a016e16a01db5123e4e022820698f46d9bad1078bd24675b4b181e91f

Download Submit
\Users\Admin\AppData\Local\Temp\69577.exe
MD5
542f3ea693d61187bd10db0376a6b3e7

SHA1
92409ffc8c6ea0ae55a76b6b15616f75174dba97

SHA256
614ea8187654128fc27a51455ab3c8fdbb6d398382cd4d825cf795dbbf5d7966

SHA512
cb383f540285ceb9232a4cc807b5287c4145f6c62fbf961385ef97a68034cc07c37337a595c403dbfe073ad0eac39ce765d58914856051a4c413d6ee5dbc4fb1

Download Submit
\Users\Public\69577.exe
MD5
542f3ea693d61187bd10db0376a6b3e7

SHA1
92409ffc8c6ea0ae55a76b6b15616f75174dba97

SHA256
614ea8187654128fc27a51455ab3c8fdbb6d398382cd4d825cf795dbbf5d7966

SHA512
cb383f540285ceb9232a4cc807b5287c4145f6c62fbf961385ef97a68034cc07c37337a595c403dbfe073ad0eac39ce765d58914856051a4c413d6ee5dbc4fb1

Download Submit
memory/1148-76-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1148-77-0x000000000040717B-mapping.dmp

Download
memory/1148-80-0x0000000000400000-0x0000000000438000-memory.dmp

Filesize
224KB

Download
memory/1188-65-0x0000000075D11000-0x0000000075D13000-memory.dmp

Filesize
8KB

Download
memory/1564-86-0x0000000000000000-mapping.dmp

Download
memory/1572-72-0x00000000048C0000-0x00000000048C1000-memory.dmp

Filesize
4KB

Download
memory/1572-73-0x00000000001A0000-0x00000000001A2000-memory.dmp

Filesize
8KB

Download
memory/1572-74-0x0000000000770000-0x00000000007AB000-memory.dmp

Filesize
236KB

Download
memory/1572-70-0x0000000000CE0000-0x0000000000CE1000-memory.dmp

Filesize
4KB

Download
memory/1572-67-0x0000000000000000-mapping.dmp

Download
memory/1768-60-0x0000000072D51000-0x0000000072D54000-memory.dmp

Filesize
12KB

Download
memory/1768-62-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/1768-61-0x00000000707D1000-0x00000000707D3000-memory.dmp

Filesize
8KB

Download
memory/1768-89-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/1992-87-0x0000000000000000-mapping.dmp

Download
memory/2008-63-0x0000000000000000-mapping.dmp

Download
memory/2008-64-0x000007FEFC251000-0x000007FEFC253000-memory.dmp

Filesize
8KB

Download