isrstealer | 4ce1b099d3e0a4198602e797e38e3cf183edcf26c6c911a725146d41b7917eae

General

Target

4ce1b099d3e0a4198602e797e38e3cf183edcf26c6c911a725146d41b7917eae.exe
Size

567KB
MD5

481ed407e75685b552fc1fd9fb5eca38
SHA1

5af33a34ce57af7387eb379e3d5ab8b450e5f3b0
SHA256

4ce1b099d3e0a4198602e797e38e3cf183edcf26c6c911a725146d41b7917eae
SHA512

c36e01cdc58991f0cddb7c80ad4bb06b18d95c09f8109b1b36e7343fc0705c9ded9f075d7e06f209d033e37aba17f7117c95741886f305f7c0cc9bc92fa8ab10
SSDEEP

12288:odS/kWXb+BSC9GKhTej/NM7N2BMYAx7DrT6lnd1G7p:CScmkSC9Gx/NM7N2mYizZp

Score

10^/10

isrstealer collection 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
behavioral1/memory/1812-62-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1812-64-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1812-65-0x0000000000401180-mapping.dmp	family_isrstealer
behavioral1/memory/1812-71-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1812-88-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/2044-84-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/2044-85-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/2044-86-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 3 IoCs

resource	yara_rule
behavioral1/memory/2044-84-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/2044-85-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/2044-86-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 10 IoCs

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

upx

resource	yara_rule
behavioral1/memory/1972-72-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1972-76-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1972-77-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1972-78-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/2044-79-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/2044-83-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/2044-84-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/2044-85-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/2044-86-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1972-87-0x0000000000400000-0x0000000000453000-memory.dmp	upx

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3406023954-474543476-3319432036-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	vbc.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 564 set thread context of 1812	564	4ce1b099d3e0a4198602e797e38e3cf183edcf26c6c911a725146d41b7917eae.exe	28
PID 1812 set thread context of 1972	1812	vbc.exe	29
PID 1812 set thread context of 2044	1812	vbc.exe	30

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	564	4ce1b099d3e0a4198602e797e38e3cf183edcf26c6c911a725146d41b7917eae.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1812	vbc.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 564 wrote to memory of 1812	564	4ce1b099d3e0a4198602e797e38e3cf183edcf26c6c911a725146d41b7917eae.exe	28
PID 564 wrote to memory of 1812	564	4ce1b099d3e0a4198602e797e38e3cf183edcf26c6c911a725146d41b7917eae.exe	28
PID 564 wrote to memory of 1812	564	4ce1b099d3e0a4198602e797e38e3cf183edcf26c6c911a725146d41b7917eae.exe	28
PID 564 wrote to memory of 1812	564	4ce1b099d3e0a4198602e797e38e3cf183edcf26c6c911a725146d41b7917eae.exe	28
PID 564 wrote to memory of 1812	564	4ce1b099d3e0a4198602e797e38e3cf183edcf26c6c911a725146d41b7917eae.exe	28
PID 564 wrote to memory of 1812	564	4ce1b099d3e0a4198602e797e38e3cf183edcf26c6c911a725146d41b7917eae.exe	28
PID 564 wrote to memory of 1812	564	4ce1b099d3e0a4198602e797e38e3cf183edcf26c6c911a725146d41b7917eae.exe	28
PID 564 wrote to memory of 1812	564	4ce1b099d3e0a4198602e797e38e3cf183edcf26c6c911a725146d41b7917eae.exe	28
PID 1812 wrote to memory of 1972	1812	vbc.exe	29
PID 1812 wrote to memory of 1972	1812	vbc.exe	29
PID 1812 wrote to memory of 1972	1812	vbc.exe	29
PID 1812 wrote to memory of 1972	1812	vbc.exe	29
PID 1812 wrote to memory of 1972	1812	vbc.exe	29
PID 1812 wrote to memory of 1972	1812	vbc.exe	29
PID 1812 wrote to memory of 1972	1812	vbc.exe	29
PID 1812 wrote to memory of 1972	1812	vbc.exe	29
PID 1812 wrote to memory of 1972	1812	vbc.exe	29
PID 1812 wrote to memory of 2044	1812	vbc.exe	30
PID 1812 wrote to memory of 2044	1812	vbc.exe	30
PID 1812 wrote to memory of 2044	1812	vbc.exe	30
PID 1812 wrote to memory of 2044	1812	vbc.exe	30
PID 1812 wrote to memory of 2044	1812	vbc.exe	30
PID 1812 wrote to memory of 2044	1812	vbc.exe	30
PID 1812 wrote to memory of 2044	1812	vbc.exe	30
PID 1812 wrote to memory of 2044	1812	vbc.exe	30
PID 1812 wrote to memory of 2044	1812	vbc.exe	30

C:\Users\Admin\AppData\Local\Temp\4ce1b099d3e0a4198602e797e38e3cf183edcf26c6c911a725146d41b7917eae.exe
"C:\Users\Admin\AppData\Local\Temp\4ce1b099d3e0a4198602e797e38e3cf183edcf26c6c911a725146d41b7917eae.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:564
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
  "C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1812
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\VK4eGNMnyx.ini"
    3⤵
    PID:1972
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\bdydtpXhYU.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:2044

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scripting

1

T1064

Persistence

Privilege Escalation

Defense Evasion

Scripting

1

T1064

Credential Access

Discovery

Lateral Movement

Collection

Email Collection

1

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/564-68-0x0000000074300000-0x00000000748AB000-memory.dmp

Filesize
5.7MB

Download
memory/564-55-0x0000000074300000-0x00000000748AB000-memory.dmp

Filesize
5.7MB

Download
memory/564-56-0x0000000074300000-0x00000000748AB000-memory.dmp

Filesize
5.7MB

Download
memory/564-57-0x0000000000C16000-0x0000000000C27000-memory.dmp

Filesize
68KB

Download
memory/564-58-0x0000000000C16000-0x0000000000C27000-memory.dmp

Filesize
68KB

Download
memory/564-54-0x0000000075D01000-0x0000000075D03000-memory.dmp

Filesize
8KB

Download
memory/564-69-0x0000000000C16000-0x0000000000C27000-memory.dmp

Filesize
68KB

Download
memory/1812-71-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1812-64-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1812-62-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1812-60-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1812-59-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1812-88-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1972-77-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1972-76-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1972-72-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1972-78-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1972-87-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/2044-79-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2044-83-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2044-84-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2044-85-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/2044-86-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download

Analysis

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