isrstealer | c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88

Analysis

max time kernel
80s
max time network
46s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
13-10-2022 16:51

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General

Target

c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88.exe
Size

385KB
MD5

651b487fd423ec8448f11d23f500ec10
SHA1

da43197862d2a936b55f96901d12c87f0db983d8
SHA256

c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88
SHA512

bf3508bb2719968aa1b924a073f5e67ac901b26adf1e1b0f834260e3618066cad1aa5029769b539d579408aa80c6c81d07b55328868c778ff50a8ff73dfece1b
SSDEEP

6144:Oex5IamdAAdX+UkKK0r6vpjzWPu9XQRXKJYO3snCo9UJPHmViI:N5IaiAALKmWJWPyXkrksnCWyO

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 6 IoCs

resource	yara_rule
behavioral1/memory/1768-59-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1768-61-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1768-62-0x0000000000401180-mapping.dmp	family_isrstealer
behavioral1/memory/1768-73-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1768-84-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral1/memory/1768-85-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/1124-81-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/1124-83-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral1/memory/1124-81-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/1124-83-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 9 IoCs

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

upx

resource	yara_rule
behavioral1/memory/960-66-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/960-70-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/960-71-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/960-74-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1124-76-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1124-80-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1124-81-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/960-82-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1124-83-0x0000000000400000-0x000000000041F000-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-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	vbc.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1828 set thread context of 1768	1828	c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88.exe	27
PID 1768 set thread context of 960	1768	vbc.exe	28
PID 1768 set thread context of 1124	1768	vbc.exe	29

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\Microsoft.NET\Framework\v2.0.50727\config\security.config.cch.new	c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88.exe
File created	C:\Windows\Microsoft.NET\Framework\v2.0.50727\config\enterprisesec.config.cch.new	c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1768	vbc.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 1828 wrote to memory of 1768	1828	c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88.exe	27
PID 1828 wrote to memory of 1768	1828	c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88.exe	27
PID 1828 wrote to memory of 1768	1828	c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88.exe	27
PID 1828 wrote to memory of 1768	1828	c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88.exe	27
PID 1828 wrote to memory of 1768	1828	c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88.exe	27
PID 1828 wrote to memory of 1768	1828	c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88.exe	27
PID 1828 wrote to memory of 1768	1828	c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88.exe	27
PID 1828 wrote to memory of 1768	1828	c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88.exe	27
PID 1828 wrote to memory of 1768	1828	c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88.exe	27
PID 1768 wrote to memory of 960	1768	vbc.exe	28
PID 1768 wrote to memory of 960	1768	vbc.exe	28
PID 1768 wrote to memory of 960	1768	vbc.exe	28
PID 1768 wrote to memory of 960	1768	vbc.exe	28
PID 1768 wrote to memory of 960	1768	vbc.exe	28
PID 1768 wrote to memory of 960	1768	vbc.exe	28
PID 1768 wrote to memory of 960	1768	vbc.exe	28
PID 1768 wrote to memory of 960	1768	vbc.exe	28
PID 1768 wrote to memory of 960	1768	vbc.exe	28
PID 1768 wrote to memory of 1124	1768	vbc.exe	29
PID 1768 wrote to memory of 1124	1768	vbc.exe	29
PID 1768 wrote to memory of 1124	1768	vbc.exe	29
PID 1768 wrote to memory of 1124	1768	vbc.exe	29
PID 1768 wrote to memory of 1124	1768	vbc.exe	29
PID 1768 wrote to memory of 1124	1768	vbc.exe	29
PID 1768 wrote to memory of 1124	1768	vbc.exe	29
PID 1768 wrote to memory of 1124	1768	vbc.exe	29
PID 1768 wrote to memory of 1124	1768	vbc.exe	29

C:\Users\Admin\AppData\Local\Temp\c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88.exe
"C:\Users\Admin\AppData\Local\Temp\c5f3b728dab3b946f80e363c354d5821d87e67d0d27e2b938bb395e64565ff88.exe"
1⤵
- Suspicious use of SetThreadContext
- Drops file in Windows directory
- Suspicious use of WriteProcessMemory
PID:1828
- 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:1768
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\dJ8YFGBuqg.ini"
    3⤵
    PID:960
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\loZSXVfyrB.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:1124

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scripting

T1064

Persistence

Privilege Escalation

Defense Evasion

Scripting

T1064

Credential Access

Discovery

Lateral Movement

Collection

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/960-66-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/960-82-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/960-74-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/960-71-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/960-70-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1124-83-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1124-76-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1124-80-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1124-81-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1768-61-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1768-59-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1768-57-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1768-85-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1768-56-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1768-73-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1768-84-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/1828-54-0x0000000075F51000-0x0000000075F53000-memory.dmp

Filesize
8KB

Download
memory/1828-55-0x0000000073FC0000-0x000000007456B000-memory.dmp

Filesize
5.7MB

Download
memory/1828-75-0x0000000073FC0000-0x000000007456B000-memory.dmp

Filesize
5.7MB

Download
memory/1828-72-0x0000000073FC0000-0x000000007456B000-memory.dmp

Filesize
5.7MB

Download