isrstealer | d980abe9f8e702a47b8716f45d36519d0250dd7e42620802b3922e8937947532

General

Target

Shipment doc.exe
Size

431KB
MD5

7267866e61ab496ef241adb843643536
SHA1

63ab40146c9f186b0c6a20b623f25f8eb58b6173
SHA256

3ab5088c86cf977cb96bfb1616f8f9ec791d6e3356e346364f4255370973f5d0
SHA512

74521abfe1f7bf286a7873e61b4e104b1f2923678dbda82e90e7e3c8abf9f61dfe200de88ac75f7bb99d9b095deb98fc7aa89210c90469b36ed38cf8f49bb104
SSDEEP

12288:M5yqoY2ukkEOG/8k3GSmksW2FgSiKVAEVsL4EfBj:6Nk4GEk3GSFsDgpEVruBj

Score

10^/10

isrstealer collection spyware stealer trojan upx

Malware Config

Signatures

ISR Stealer
ISR Stealer is a modified version of Hackhound Stealer written in visual basic.
trojan stealer isrstealer

ISR Stealer payload 5 IoCs

resource	yara_rule
behavioral2/memory/688-135-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/688-137-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/688-141-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/688-145-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/688-155-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/4140-152-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/4140-154-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/4140-156-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 3 IoCs

resource	yara_rule
behavioral2/memory/4140-152-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/4140-154-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/4140-156-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 10 IoCs

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

upx

resource	yara_rule
behavioral2/memory/2172-143-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2172-146-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/2172-147-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4140-149-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4140-151-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4140-152-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/2172-153-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral2/memory/4140-154-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4140-156-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/2172-157-0x0000000000400000-0x0000000000453000-memory.dmp	upx

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 Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	Shipment doc.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1624 set thread context of 688	1624	Shipment doc.exe	89
PID 688 set thread context of 2172	688	Shipment doc.exe	90
PID 688 set thread context of 4140	688	Shipment doc.exe	91

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1624	Shipment doc.exe
1624	Shipment doc.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1624	Shipment doc.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
688	Shipment doc.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 1624 wrote to memory of 688	1624	Shipment doc.exe	89
PID 1624 wrote to memory of 688	1624	Shipment doc.exe	89
PID 1624 wrote to memory of 688	1624	Shipment doc.exe	89
PID 1624 wrote to memory of 688	1624	Shipment doc.exe	89
PID 1624 wrote to memory of 688	1624	Shipment doc.exe	89
PID 1624 wrote to memory of 688	1624	Shipment doc.exe	89
PID 1624 wrote to memory of 688	1624	Shipment doc.exe	89
PID 688 wrote to memory of 2172	688	Shipment doc.exe	90
PID 688 wrote to memory of 2172	688	Shipment doc.exe	90
PID 688 wrote to memory of 2172	688	Shipment doc.exe	90
PID 688 wrote to memory of 2172	688	Shipment doc.exe	90
PID 688 wrote to memory of 2172	688	Shipment doc.exe	90
PID 688 wrote to memory of 2172	688	Shipment doc.exe	90
PID 688 wrote to memory of 2172	688	Shipment doc.exe	90
PID 688 wrote to memory of 2172	688	Shipment doc.exe	90
PID 688 wrote to memory of 4140	688	Shipment doc.exe	91
PID 688 wrote to memory of 4140	688	Shipment doc.exe	91
PID 688 wrote to memory of 4140	688	Shipment doc.exe	91
PID 688 wrote to memory of 4140	688	Shipment doc.exe	91
PID 688 wrote to memory of 4140	688	Shipment doc.exe	91
PID 688 wrote to memory of 4140	688	Shipment doc.exe	91
PID 688 wrote to memory of 4140	688	Shipment doc.exe	91
PID 688 wrote to memory of 4140	688	Shipment doc.exe	91

C:\Users\Admin\AppData\Local\Temp\Shipment doc.exe
"C:\Users\Admin\AppData\Local\Temp\Shipment doc.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1624
- C:\Users\Admin\AppData\Local\Temp\Shipment doc.exe
  "C:\Users\Admin\AppData\Local\Temp\Shipment doc.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:688
- - C:\Users\Admin\AppData\Local\Temp\Shipment doc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\Y0e5RNkaqd.ini"
    3⤵
    PID:2172
- - C:\Users\Admin\AppData\Local\Temp\Shipment doc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\6t07bB2Zsi.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:4140

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

1

T1081

Discovery

Lateral Movement

Collection

Data from Local System

Email Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/688-145-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/688-135-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/688-137-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/688-141-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/688-155-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1624-133-0x0000000074E50000-0x0000000075401000-memory.dmp

Filesize
5.7MB

Download
memory/1624-138-0x0000000074E50000-0x0000000075401000-memory.dmp

Filesize
5.7MB

Download
memory/1624-132-0x0000000074E50000-0x0000000075401000-memory.dmp

Filesize
5.7MB

Download
memory/2172-146-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2172-143-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2172-147-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2172-153-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2172-157-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/4140-149-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4140-151-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4140-152-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4140-154-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4140-156-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download

Analysis

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