ostap | 315644e7ccc27084de88d6108f59edde58a8775584bdf2e5fbb22841cc353e5d

Analysis

max time kernel
169s
max time network
228s
platform
windows10-2004_x64
resource
win10v2004-20220414-en
submitted
20/05/2022, 05:03

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General

Target
315644e7ccc27084de88d6108f59edde58a8775584bdf2e5fbb22841cc353e5d.docm
Size 487KB
Sample220520-fp414adggk
SHA256 315644e7ccc27084de88d6108f59edde58a8775584bdf2e5fbb22841cc353e5d
MD5 05cb50f35c90a9373786deaf55bf72c8
SHA1 e5604680b11e788d04b906d3e2560fa44e498b2c
SHA512 864e6955ff303560e120d0fde43898809e2542e1c19aa2cbd12168c6804bb660f67270ee33919f651b4b8bc2526e785d193d5ffbdc0f90b8fa0e6ee1beb9d64c
MD5 SHA1 SHA512

Score

10^/10

ostap downloader

Malware Config

Signatures

Ostap JavaScript Downloader 1 IoCs

Ostap is a JavaScript downloader that's been active since 2016. It's used to deliver several families, inluding TrickBot

resource	yara_rule
behavioral2/files/0x00060000000231d5-142.dat	family_ostap

Process spawned unexpected child process 1 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

description	pid	pid_target	Process	procid_target
Parent C:\Program Files\Microsoft Office\Root\Office16\WINWORD.EXE is not expected to spawn this process	1660	1284	cmd.exe	78

ostap
Ostap is a JS downloader, used to deliver other families.
downloader ostap

Process spawned suspicious child process 1 IoCs

This child process is typically not spawned unless (for example) the parent process crashes. This typically indicates the parent process was unsuccessfully compromised.

description	pid	pid_target	Process	procid_target
Parent C:\Program Files\Microsoft Office\Root\Office16\WINWORD.EXE is not expected to spawn this process	1728	1284	DW20.EXE	78

Checks processor information in registry 2 TTPs 6 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	WINWORD.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	WINWORD.EXE
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	dwwin.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	dwwin.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	dwwin.exe
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	WINWORD.EXE

Enumerates system info in registry 2 TTPs 5 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	WINWORD.EXE
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	dwwin.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	dwwin.exe
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	WINWORD.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily	WINWORD.EXE

Suspicious behavior: AddClipboardFormatListener 2 IoCs

pid	Process
1284	WINWORD.EXE
1284	WINWORD.EXE

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1284	WINWORD.EXE
1284	WINWORD.EXE
1284	WINWORD.EXE
1284	WINWORD.EXE

Suspicious use of SetWindowsHookEx 7 IoCs

pid	Process
1284	WINWORD.EXE
1284	WINWORD.EXE
1284	WINWORD.EXE
1284	WINWORD.EXE
1284	WINWORD.EXE
1284	WINWORD.EXE
1284	WINWORD.EXE

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1284 wrote to memory of 1660	1284	WINWORD.EXE	83
PID 1284 wrote to memory of 1660	1284	WINWORD.EXE	83
PID 1660 wrote to memory of 3456	1660	cmd.exe	85
PID 1660 wrote to memory of 3456	1660	cmd.exe	85
PID 1284 wrote to memory of 1728	1284	WINWORD.EXE	91
PID 1284 wrote to memory of 1728	1284	WINWORD.EXE	91
PID 1728 wrote to memory of 3696	1728	DW20.EXE	93
PID 1728 wrote to memory of 3696	1728	DW20.EXE	93

C:\Program Files\Microsoft Office\Root\Office16\WINWORD.EXE
"C:\Program Files\Microsoft Office\Root\Office16\WINWORD.EXE" /n "C:\Users\Admin\AppData\Local\Temp\315644e7ccc27084de88d6108f59edde58a8775584bdf2e5fbb22841cc353e5d.docm" /o ""
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1284
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c C:\LibWinTasksProvider\WedpolicyDepSet\CalenderView.BAT
  2⤵
  - Process spawned unexpected child process
  - Suspicious use of WriteProcessMemory
  PID:1660
- - C:\Windows\system32\wscript.exe
    wscript C:\LibWinTasksProvider\CalenderView.JSE /nologo
    3⤵
    PID:3456
- C:\Program Files\Microsoft Office\root\vfs\ProgramFilesCommonX64\Microsoft Shared\DW\DW20.EXE
  "C:\Program Files\Microsoft Office\root\vfs\ProgramFilesCommonX64\Microsoft Shared\DW\DW20.EXE" -x -s 4952
  2⤵
  - Process spawned suspicious child process
  - Suspicious use of WriteProcessMemory
  PID:1728
- - C:\Windows\system32\dwwin.exe
    C:\Windows\system32\dwwin.exe -x -s 4952
    3⤵
    - Checks processor information in registry
    - Enumerates system info in registry
    PID:3696

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

CalenderView.JSE

Path C:\LibWinTasksProvider\CalenderView.JSE
Size 336KB
SHA256 3e76e0aaac22c57a6928fa2b5864098ceb56b836e0b20f568cc476b99f82568a
MD5 3573a33988c2c19f18d2de07b87818fc
SHA1 7b44b46e34c1b0cb76522b763d3035f6c7d39a12
SHA512 5b224b631a7e3d26bef8c4e55dc4fa8e0971431d31290fb72b3565d281987d5eed31e3cf63e5a56c50c989ce5f14c20fea1f686fc16cceefb97ba88863253875
SSDEEP 3072:PRCmNYBeEeOomKMNi3LkovP3MsrlK7YVEmG1/5IwZnVE7A7h7iGfdzTET9:ZCmNYBeExNvhrPfE7ANu
MD5 SHA1 SHA512 SSDEEP

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CalenderView.BAT

Path C:\LibWinTasksProvider\WedpolicyDepSet\CalenderView.BAT
Size 57B
SHA256 7414e595c91d12ba7f4aabe2842b7743d5dee264016dfb82bf5314f17f29eddf
MD5 61e8655ca1393b13c826953a9bbf13d3
SHA1 8c374c3db43c183cb7b1afb9780f34facfe3a6b8
SHA512 f9688ff4464a263f613d5c979d2c3f4f513f2cdf9f89390b5b2e1487373de308a810e75cd65888eabde96ede71ee0da74e6c10f2a374dae83e98cb116f055d6d
MD5 SHA1 SHA512

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memory/1284-135-0x00007FFBA5150000-0x00007FFBA5160000-memory.dmp

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memory/1284-131-0x00007FFBA71B0000-0x00007FFBA71C0000-memory.dmp

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memory/1284-134-0x00007FFBA71B0000-0x00007FFBA71C0000-memory.dmp

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memory/1284-130-0x00007FFBA71B0000-0x00007FFBA71C0000-memory.dmp

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memory/1284-136-0x00007FFBA5150000-0x00007FFBA5160000-memory.dmp

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memory/1284-137-0x0000020BFB140000-0x0000020BFB144000-memory.dmp

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memory/1284-138-0x0000020BF9E4A000-0x0000020BF9E4C000-memory.dmp

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memory/1284-143-0x0000020BFA0A5000-0x0000020BFA0A7000-memory.dmp

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memory/1284-132-0x00007FFBA71B0000-0x00007FFBA71C0000-memory.dmp

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memory/1284-133-0x00007FFBA71B0000-0x00007FFBA71C0000-memory.dmp

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memory/1728-154-0x00007FFBA71B0000-0x00007FFBA71C0000-memory.dmp

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memory/1728-153-0x00007FFBA71B0000-0x00007FFBA71C0000-memory.dmp

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memory/1728-151-0x00007FFBA71B0000-0x00007FFBA71C0000-memory.dmp

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memory/1728-152-0x00007FFBA71B0000-0x00007FFBA71C0000-memory.dmp

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