vobfus | 5e2395dce1bb61098d55c6df2541071ca8f8c825b5aa9ce3b8afabcdeff4c504

General

Target

e4f8cb43ff3a4e35b502d584fc924cb0_JaffaCakes118.exe
Size

176KB
MD5

e4f8cb43ff3a4e35b502d584fc924cb0
SHA1

e8593ba21adb977971d66066e600e3633a7a1bd4
SHA256

5e2395dce1bb61098d55c6df2541071ca8f8c825b5aa9ce3b8afabcdeff4c504
SHA512

4cd07e430e1ec33a9290673f80717c941c697cac952793e40be9f77c79e572667939a44a5f498c158242a2f143f9ce6222d04a948ff4cba8283a1e69391c6975
SSDEEP

3072:LR3JTDPB1zUc/H+0SwNayfX/k2C9SY6G5xYslSNag/p2:LvTDP0+TZar2C7oA

Score

10^/10

vobfus discovery upx worm

Malware Config

Signatures

Vobfus
A widespread worm which spreads via network drives and removable media.
worm vobfus

UPX packed file 7 IoCs

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

upx

resource	yara_rule
behavioral1/memory/2280-3-0x0000000000400000-0x0000000000420000-memory.dmp	upx
behavioral1/memory/2280-6-0x0000000000400000-0x0000000000420000-memory.dmp	upx
behavioral1/memory/2280-7-0x0000000000400000-0x0000000000420000-memory.dmp	upx
behavioral1/memory/2280-9-0x0000000000400000-0x0000000000420000-memory.dmp	upx
behavioral1/memory/2280-12-0x0000000000400000-0x0000000000420000-memory.dmp	upx
behavioral1/memory/2280-14-0x0000000000400000-0x0000000000420000-memory.dmp	upx
behavioral1/memory/2280-18-0x0000000000400000-0x0000000000420000-memory.dmp	upx

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2204 set thread context of 2280	2204	e4f8cb43ff3a4e35b502d584fc924cb0_JaffaCakes118.exe	28

System Location Discovery: System Language Discovery 1 TTPs 2 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	e4f8cb43ff3a4e35b502d584fc924cb0_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vbc.exe

Script User-Agent 2 IoCs

Uses user-agent string associated with script host/environment.

description	flow	ioc
HTTP User-Agent header	3	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)
HTTP User-Agent header	4	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2280	vbc.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2280	vbc.exe
2280	vbc.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2204 wrote to memory of 2280	2204	e4f8cb43ff3a4e35b502d584fc924cb0_JaffaCakes118.exe	28
PID 2204 wrote to memory of 2280	2204	e4f8cb43ff3a4e35b502d584fc924cb0_JaffaCakes118.exe	28
PID 2204 wrote to memory of 2280	2204	e4f8cb43ff3a4e35b502d584fc924cb0_JaffaCakes118.exe	28
PID 2204 wrote to memory of 2280	2204	e4f8cb43ff3a4e35b502d584fc924cb0_JaffaCakes118.exe	28
PID 2204 wrote to memory of 2280	2204	e4f8cb43ff3a4e35b502d584fc924cb0_JaffaCakes118.exe	28
PID 2204 wrote to memory of 2280	2204	e4f8cb43ff3a4e35b502d584fc924cb0_JaffaCakes118.exe	28
PID 2204 wrote to memory of 2280	2204	e4f8cb43ff3a4e35b502d584fc924cb0_JaffaCakes118.exe	28
PID 2204 wrote to memory of 2280	2204	e4f8cb43ff3a4e35b502d584fc924cb0_JaffaCakes118.exe	28
PID 2204 wrote to memory of 2280	2204	e4f8cb43ff3a4e35b502d584fc924cb0_JaffaCakes118.exe	28

C:\Users\Admin\AppData\Local\Temp\e4f8cb43ff3a4e35b502d584fc924cb0_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\e4f8cb43ff3a4e35b502d584fc924cb0_JaffaCakes118.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2204
- C:\Windows\Microsoft.Net\Framework\v2.0.50727\vbc.exe
  C:\Windows\Microsoft.Net\Framework\v2.0.50727\vbc.exe
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of SetWindowsHookEx
  PID:2280

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scripting

1

T1064

Persistence

Privilege Escalation

Defense Evasion

Scripting

1

T1064

Credential Access

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/2204-0-0x0000000074A31000-0x0000000074A32000-memory.dmp

Filesize
4KB

Download
memory/2204-1-0x0000000074A30000-0x0000000074FDB000-memory.dmp

Filesize
5.7MB

Download
memory/2204-2-0x0000000074A30000-0x0000000074FDB000-memory.dmp

Filesize
5.7MB

Download
memory/2204-4-0x0000000074A30000-0x0000000074FDB000-memory.dmp

Filesize
5.7MB

Download
memory/2280-3-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2280-6-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2280-7-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2280-9-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2280-12-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2280-14-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download
memory/2280-18-0x0000000000400000-0x0000000000420000-memory.dmp

Filesize
128KB

Download

Analysis

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